mirror of https://github.com/apache/lucene.git
LUCENE-5675: break out SegmentTermsEnum.Frame
git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5675@1595025 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael McCandless
parent
9ebab12f64
commit
281e53b82b
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@ -37,13 +37,15 @@ import org.apache.lucene.util.fst.Util;
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/** Iterates through terms in this field */
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final class SegmentTermsEnum extends TermsEnum {
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private IndexInput in;
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private Frame[] stack;
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private final Frame staticFrame;
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private Frame currentFrame;
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private boolean termExists;
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private final FieldReader fr;
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// Lazy init:
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IndexInput in;
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private SegmentTermsEnumFrame[] stack;
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private final SegmentTermsEnumFrame staticFrame;
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SegmentTermsEnumFrame currentFrame;
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boolean termExists;
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final FieldReader fr;
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// nocommit make this public "for casting" and add a getVersion method?
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@ -67,10 +69,10 @@ final class SegmentTermsEnum extends TermsEnum {
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this.fr = fr;
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//if (DEBUG) System.out.println("BTTR.init seg=" + segment);
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stack = new Frame[0];
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stack = new SegmentTermsEnumFrame[0];
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// Used to hold seek by TermState, or cached seek
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staticFrame = new Frame(-1);
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staticFrame = new SegmentTermsEnumFrame(this, -1);
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if (fr.index == null) {
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fstReader = null;
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@ -204,12 +206,12 @@ final class SegmentTermsEnum extends TermsEnum {
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return stats;
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}
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private Frame getFrame(int ord) throws IOException {
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private SegmentTermsEnumFrame getFrame(int ord) throws IOException {
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if (ord >= stack.length) {
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final Frame[] next = new Frame[ArrayUtil.oversize(1+ord, RamUsageEstimator.NUM_BYTES_OBJECT_REF)];
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final SegmentTermsEnumFrame[] next = new SegmentTermsEnumFrame[ArrayUtil.oversize(1+ord, RamUsageEstimator.NUM_BYTES_OBJECT_REF)];
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System.arraycopy(stack, 0, next, 0, stack.length);
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for(int stackOrd=stack.length;stackOrd<next.length;stackOrd++) {
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next[stackOrd] = new Frame(stackOrd);
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next[stackOrd] = new SegmentTermsEnumFrame(this, stackOrd);
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}
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stack = next;
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}
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@ -231,11 +233,11 @@ final class SegmentTermsEnum extends TermsEnum {
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}
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// Pushes a frame we seek'd to
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Frame pushFrame(FST.Arc<BytesRef> arc, BytesRef frameData, int length) throws IOException {
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SegmentTermsEnumFrame pushFrame(FST.Arc<BytesRef> arc, BytesRef frameData, int length) throws IOException {
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scratchReader.reset(frameData.bytes, frameData.offset, frameData.length);
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final long code = scratchReader.readVLong();
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final long fpSeek = code >>> BlockTreeTermsWriter.OUTPUT_FLAGS_NUM_BITS;
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final Frame f = getFrame(1+currentFrame.ord);
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final SegmentTermsEnumFrame f = getFrame(1+currentFrame.ord);
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f.hasTerms = (code & BlockTreeTermsWriter.OUTPUT_FLAG_HAS_TERMS) != 0;
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f.hasTermsOrig = f.hasTerms;
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f.isFloor = (code & BlockTreeTermsWriter.OUTPUT_FLAG_IS_FLOOR) != 0;
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@ -249,8 +251,8 @@ final class SegmentTermsEnum extends TermsEnum {
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// Pushes next'd frame or seek'd frame; we later
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// lazy-load the frame only when needed
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Frame pushFrame(FST.Arc<BytesRef> arc, long fp, int length) throws IOException {
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final Frame f = getFrame(1+currentFrame.ord);
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SegmentTermsEnumFrame pushFrame(FST.Arc<BytesRef> arc, long fp, int length) throws IOException {
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final SegmentTermsEnumFrame f = getFrame(1+currentFrame.ord);
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f.arc = arc;
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if (f.fpOrig == fp && f.nextEnt != -1) {
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//if (DEBUG) System.out.println(" push reused frame ord=" + f.ord + " fp=" + f.fp + " isFloor?=" + f.isFloor + " hasTerms=" + f.hasTerms + " pref=" + term + " nextEnt=" + f.nextEnt + " targetBeforeCurrentLength=" + targetBeforeCurrentLength + " term.length=" + term.length + " vs prefix=" + f.prefix);
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@ -335,7 +337,7 @@ final class SegmentTermsEnum extends TermsEnum {
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output = arc.output;
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targetUpto = 0;
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Frame lastFrame = stack[0];
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SegmentTermsEnumFrame lastFrame = stack[0];
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assert validIndexPrefix <= term.length;
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final int targetLimit = Math.min(target.length, validIndexPrefix);
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@ -595,7 +597,7 @@ final class SegmentTermsEnum extends TermsEnum {
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output = arc.output;
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targetUpto = 0;
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Frame lastFrame = stack[0];
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SegmentTermsEnumFrame lastFrame = stack[0];
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assert validIndexPrefix <= term.length;
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final int targetLimit = Math.min(target.length, validIndexPrefix);
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@ -816,7 +818,7 @@ final class SegmentTermsEnum extends TermsEnum {
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int ord = 0;
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boolean isSeekFrame = true;
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while(true) {
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Frame f = getFrame(ord);
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SegmentTermsEnumFrame f = getFrame(ord);
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assert f != null;
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final BytesRef prefix = new BytesRef(term.bytes, 0, f.prefix);
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if (f.nextEnt == -1) {
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@ -1034,720 +1036,4 @@ final class SegmentTermsEnum extends TermsEnum {
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public long ord() {
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throw new UnsupportedOperationException();
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}
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// Not static -- references term, postingsReader,
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// fieldInfo, in
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final class Frame {
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// Our index in stack[]:
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final int ord;
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boolean hasTerms;
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boolean hasTermsOrig;
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boolean isFloor;
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FST.Arc<BytesRef> arc;
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// File pointer where this block was loaded from
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long fp;
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long fpOrig;
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long fpEnd;
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byte[] suffixBytes = new byte[128];
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final ByteArrayDataInput suffixesReader = new ByteArrayDataInput();
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byte[] statBytes = new byte[64];
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final ByteArrayDataInput statsReader = new ByteArrayDataInput();
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byte[] floorData = new byte[32];
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final ByteArrayDataInput floorDataReader = new ByteArrayDataInput();
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// Length of prefix shared by all terms in this block
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int prefix;
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// Number of entries (term or sub-block) in this block
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int entCount;
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// Which term we will next read, or -1 if the block
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// isn't loaded yet
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int nextEnt;
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// True if this block is either not a floor block,
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// or, it's the last sub-block of a floor block
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boolean isLastInFloor;
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// True if all entries are terms
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boolean isLeafBlock;
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long lastSubFP;
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int nextFloorLabel;
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int numFollowFloorBlocks;
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// Next term to decode metaData; we decode metaData
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// lazily so that scanning to find the matching term is
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// fast and only if you find a match and app wants the
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// stats or docs/positions enums, will we decode the
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// metaData
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int metaDataUpto;
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final BlockTermState state;
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// metadata buffer, holding monotonic values
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public long[] longs;
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// metadata buffer, holding general values
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public byte[] bytes;
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ByteArrayDataInput bytesReader;
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public Frame(int ord) throws IOException {
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this.ord = ord;
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this.state = fr.parent.postingsReader.newTermState();
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this.state.totalTermFreq = -1;
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this.longs = new long[fr.longsSize];
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}
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public void setFloorData(ByteArrayDataInput in, BytesRef source) {
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final int numBytes = source.length - (in.getPosition() - source.offset);
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if (numBytes > floorData.length) {
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floorData = new byte[ArrayUtil.oversize(numBytes, 1)];
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}
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System.arraycopy(source.bytes, source.offset+in.getPosition(), floorData, 0, numBytes);
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floorDataReader.reset(floorData, 0, numBytes);
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numFollowFloorBlocks = floorDataReader.readVInt();
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nextFloorLabel = floorDataReader.readByte() & 0xff;
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//if (DEBUG) {
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//System.out.println(" setFloorData fpOrig=" + fpOrig + " bytes=" + new BytesRef(source.bytes, source.offset + in.getPosition(), numBytes) + " numFollowFloorBlocks=" + numFollowFloorBlocks + " nextFloorLabel=" + toHex(nextFloorLabel));
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//}
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}
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public int getTermBlockOrd() {
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return isLeafBlock ? nextEnt : state.termBlockOrd;
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}
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void loadNextFloorBlock() throws IOException {
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//if (DEBUG) {
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//System.out.println(" loadNextFloorBlock fp=" + fp + " fpEnd=" + fpEnd);
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//}
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assert arc == null || isFloor: "arc=" + arc + " isFloor=" + isFloor;
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fp = fpEnd;
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nextEnt = -1;
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loadBlock();
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}
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/* Does initial decode of next block of terms; this
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doesn't actually decode the docFreq, totalTermFreq,
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postings details (frq/prx offset, etc.) metadata;
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it just loads them as byte[] blobs which are then
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decoded on-demand if the metadata is ever requested
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for any term in this block. This enables terms-only
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intensive consumes (eg certain MTQs, respelling) to
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not pay the price of decoding metadata they won't
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use. */
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void loadBlock() throws IOException {
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// Clone the IndexInput lazily, so that consumers
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// that just pull a TermsEnum to
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// seekExact(TermState) don't pay this cost:
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initIndexInput();
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if (nextEnt != -1) {
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// Already loaded
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return;
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}
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//System.out.println("blc=" + blockLoadCount);
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in.seek(fp);
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int code = in.readVInt();
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entCount = code >>> 1;
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assert entCount > 0;
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isLastInFloor = (code & 1) != 0;
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assert arc == null || (isLastInFloor || isFloor);
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// TODO: if suffixes were stored in random-access
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// array structure, then we could do binary search
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// instead of linear scan to find target term; eg
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// we could have simple array of offsets
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// term suffixes:
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code = in.readVInt();
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isLeafBlock = (code & 1) != 0;
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int numBytes = code >>> 1;
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if (suffixBytes.length < numBytes) {
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suffixBytes = new byte[ArrayUtil.oversize(numBytes, 1)];
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}
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in.readBytes(suffixBytes, 0, numBytes);
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suffixesReader.reset(suffixBytes, 0, numBytes);
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/*if (DEBUG) {
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if (arc == null) {
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System.out.println(" loadBlock (next) fp=" + fp + " entCount=" + entCount + " prefixLen=" + prefix + " isLastInFloor=" + isLastInFloor + " leaf?=" + isLeafBlock);
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} else {
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System.out.println(" loadBlock (seek) fp=" + fp + " entCount=" + entCount + " prefixLen=" + prefix + " hasTerms?=" + hasTerms + " isFloor?=" + isFloor + " isLastInFloor=" + isLastInFloor + " leaf?=" + isLeafBlock);
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}
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}*/
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// stats
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numBytes = in.readVInt();
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if (statBytes.length < numBytes) {
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statBytes = new byte[ArrayUtil.oversize(numBytes, 1)];
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}
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in.readBytes(statBytes, 0, numBytes);
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statsReader.reset(statBytes, 0, numBytes);
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metaDataUpto = 0;
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state.termBlockOrd = 0;
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nextEnt = 0;
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lastSubFP = -1;
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// TODO: we could skip this if !hasTerms; but
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// that's rare so won't help much
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// metadata
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numBytes = in.readVInt();
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if (bytes == null) {
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bytes = new byte[ArrayUtil.oversize(numBytes, 1)];
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bytesReader = new ByteArrayDataInput();
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} else if (bytes.length < numBytes) {
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bytes = new byte[ArrayUtil.oversize(numBytes, 1)];
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}
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in.readBytes(bytes, 0, numBytes);
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bytesReader.reset(bytes, 0, numBytes);
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// Sub-blocks of a single floor block are always
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// written one after another -- tail recurse:
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fpEnd = in.getFilePointer();
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// if (DEBUG) {
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// System.out.println(" fpEnd=" + fpEnd);
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// }
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}
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void rewind() {
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// Force reload:
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fp = fpOrig;
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nextEnt = -1;
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hasTerms = hasTermsOrig;
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if (isFloor) {
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floorDataReader.rewind();
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numFollowFloorBlocks = floorDataReader.readVInt();
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nextFloorLabel = floorDataReader.readByte() & 0xff;
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}
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/*
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//System.out.println("rewind");
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// Keeps the block loaded, but rewinds its state:
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if (nextEnt > 0 || fp != fpOrig) {
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if (DEBUG) {
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System.out.println(" rewind frame ord=" + ord + " fpOrig=" + fpOrig + " fp=" + fp + " hasTerms?=" + hasTerms + " isFloor?=" + isFloor + " nextEnt=" + nextEnt + " prefixLen=" + prefix);
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}
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if (fp != fpOrig) {
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fp = fpOrig;
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nextEnt = -1;
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} else {
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nextEnt = 0;
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}
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hasTerms = hasTermsOrig;
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if (isFloor) {
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floorDataReader.rewind();
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numFollowFloorBlocks = floorDataReader.readVInt();
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nextFloorLabel = floorDataReader.readByte() & 0xff;
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}
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assert suffixBytes != null;
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suffixesReader.rewind();
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assert statBytes != null;
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statsReader.rewind();
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metaDataUpto = 0;
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state.termBlockOrd = 0;
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// TODO: skip this if !hasTerms? Then postings
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// impl wouldn't have to write useless 0 byte
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postingsReader.resetTermsBlock(fieldInfo, state);
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lastSubFP = -1;
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} else if (DEBUG) {
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System.out.println(" skip rewind fp=" + fp + " fpOrig=" + fpOrig + " nextEnt=" + nextEnt + " ord=" + ord);
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}
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*/
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}
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public boolean next() {
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return isLeafBlock ? nextLeaf() : nextNonLeaf();
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}
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// Decodes next entry; returns true if it's a sub-block
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public boolean nextLeaf() {
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//if (DEBUG) System.out.println(" frame.next ord=" + ord + " nextEnt=" + nextEnt + " entCount=" + entCount);
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assert nextEnt != -1 && nextEnt < entCount: "nextEnt=" + nextEnt + " entCount=" + entCount + " fp=" + fp;
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nextEnt++;
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suffix = suffixesReader.readVInt();
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startBytePos = suffixesReader.getPosition();
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term.length = prefix + suffix;
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if (term.bytes.length < term.length) {
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term.grow(term.length);
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}
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suffixesReader.readBytes(term.bytes, prefix, suffix);
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// A normal term
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termExists = true;
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return false;
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}
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public boolean nextNonLeaf() {
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//if (DEBUG) System.out.println(" frame.next ord=" + ord + " nextEnt=" + nextEnt + " entCount=" + entCount);
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assert nextEnt != -1 && nextEnt < entCount: "nextEnt=" + nextEnt + " entCount=" + entCount + " fp=" + fp;
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nextEnt++;
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final int code = suffixesReader.readVInt();
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suffix = code >>> 1;
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startBytePos = suffixesReader.getPosition();
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term.length = prefix + suffix;
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if (term.bytes.length < term.length) {
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term.grow(term.length);
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}
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suffixesReader.readBytes(term.bytes, prefix, suffix);
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if ((code & 1) == 0) {
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// A normal term
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termExists = true;
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subCode = 0;
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state.termBlockOrd++;
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return false;
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} else {
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// A sub-block; make sub-FP absolute:
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termExists = false;
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subCode = suffixesReader.readVLong();
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lastSubFP = fp - subCode;
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//if (DEBUG) {
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//System.out.println(" lastSubFP=" + lastSubFP);
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//}
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return true;
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}
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}
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// TODO: make this array'd so we can do bin search?
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// likely not worth it? need to measure how many
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// floor blocks we "typically" get
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public void scanToFloorFrame(BytesRef target) {
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if (!isFloor || target.length <= prefix) {
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// if (DEBUG) {
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// System.out.println(" scanToFloorFrame skip: isFloor=" + isFloor + " target.length=" + target.length + " vs prefix=" + prefix);
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// }
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return;
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}
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final int targetLabel = target.bytes[target.offset + prefix] & 0xFF;
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// if (DEBUG) {
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// System.out.println(" scanToFloorFrame fpOrig=" + fpOrig + " targetLabel=" + toHex(targetLabel) + " vs nextFloorLabel=" + toHex(nextFloorLabel) + " numFollowFloorBlocks=" + numFollowFloorBlocks);
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// }
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if (targetLabel < nextFloorLabel) {
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// if (DEBUG) {
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// System.out.println(" already on correct block");
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// }
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return;
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}
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assert numFollowFloorBlocks != 0;
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long newFP = fpOrig;
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while (true) {
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final long code = floorDataReader.readVLong();
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newFP = fpOrig + (code >>> 1);
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hasTerms = (code & 1) != 0;
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// if (DEBUG) {
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// System.out.println(" label=" + toHex(nextFloorLabel) + " fp=" + newFP + " hasTerms?=" + hasTerms + " numFollowFloor=" + numFollowFloorBlocks);
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// }
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isLastInFloor = numFollowFloorBlocks == 1;
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numFollowFloorBlocks--;
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if (isLastInFloor) {
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nextFloorLabel = 256;
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// if (DEBUG) {
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// System.out.println(" stop! last block nextFloorLabel=" + toHex(nextFloorLabel));
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// }
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break;
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} else {
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nextFloorLabel = floorDataReader.readByte() & 0xff;
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if (targetLabel < nextFloorLabel) {
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// if (DEBUG) {
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// System.out.println(" stop! nextFloorLabel=" + toHex(nextFloorLabel));
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// }
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break;
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}
|
||||
}
|
||||
}
|
||||
|
||||
if (newFP != fp) {
|
||||
// Force re-load of the block:
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" force switch to fp=" + newFP + " oldFP=" + fp);
|
||||
// }
|
||||
nextEnt = -1;
|
||||
fp = newFP;
|
||||
} else {
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" stay on same fp=" + newFP);
|
||||
// }
|
||||
}
|
||||
}
|
||||
|
||||
public void decodeMetaData() throws IOException {
|
||||
|
||||
//if (DEBUG) System.out.println("\nBTTR.decodeMetadata seg=" + segment + " mdUpto=" + metaDataUpto + " vs termBlockOrd=" + state.termBlockOrd);
|
||||
|
||||
// lazily catch up on metadata decode:
|
||||
final int limit = getTermBlockOrd();
|
||||
boolean absolute = metaDataUpto == 0;
|
||||
assert limit > 0;
|
||||
|
||||
// TODO: better API would be "jump straight to term=N"???
|
||||
while (metaDataUpto < limit) {
|
||||
|
||||
// TODO: we could make "tiers" of metadata, ie,
|
||||
// decode docFreq/totalTF but don't decode postings
|
||||
// metadata; this way caller could get
|
||||
// docFreq/totalTF w/o paying decode cost for
|
||||
// postings
|
||||
|
||||
// TODO: if docFreq were bulk decoded we could
|
||||
// just skipN here:
|
||||
|
||||
// stats
|
||||
state.docFreq = statsReader.readVInt();
|
||||
//if (DEBUG) System.out.println(" dF=" + state.docFreq);
|
||||
if (fr.fieldInfo.getIndexOptions() != IndexOptions.DOCS_ONLY) {
|
||||
state.totalTermFreq = state.docFreq + statsReader.readVLong();
|
||||
//if (DEBUG) System.out.println(" totTF=" + state.totalTermFreq);
|
||||
}
|
||||
// metadata
|
||||
for (int i = 0; i < fr.longsSize; i++) {
|
||||
longs[i] = bytesReader.readVLong();
|
||||
}
|
||||
fr.parent.postingsReader.decodeTerm(longs, bytesReader, fr.fieldInfo, state, absolute);
|
||||
|
||||
metaDataUpto++;
|
||||
absolute = false;
|
||||
}
|
||||
state.termBlockOrd = metaDataUpto;
|
||||
}
|
||||
|
||||
// Used only by assert
|
||||
private boolean prefixMatches(BytesRef target) {
|
||||
for(int bytePos=0;bytePos<prefix;bytePos++) {
|
||||
if (target.bytes[target.offset + bytePos] != term.bytes[bytePos]) {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
// Scans to sub-block that has this target fp; only
|
||||
// called by next(); NOTE: does not set
|
||||
// startBytePos/suffix as a side effect
|
||||
public void scanToSubBlock(long subFP) {
|
||||
assert !isLeafBlock;
|
||||
//if (DEBUG) System.out.println(" scanToSubBlock fp=" + fp + " subFP=" + subFP + " entCount=" + entCount + " lastSubFP=" + lastSubFP);
|
||||
//assert nextEnt == 0;
|
||||
if (lastSubFP == subFP) {
|
||||
//if (DEBUG) System.out.println(" already positioned");
|
||||
return;
|
||||
}
|
||||
assert subFP < fp : "fp=" + fp + " subFP=" + subFP;
|
||||
final long targetSubCode = fp - subFP;
|
||||
//if (DEBUG) System.out.println(" targetSubCode=" + targetSubCode);
|
||||
while(true) {
|
||||
assert nextEnt < entCount;
|
||||
nextEnt++;
|
||||
final int code = suffixesReader.readVInt();
|
||||
suffixesReader.skipBytes(isLeafBlock ? code : code >>> 1);
|
||||
//if (DEBUG) System.out.println(" " + nextEnt + " (of " + entCount + ") ent isSubBlock=" + ((code&1)==1));
|
||||
if ((code & 1) != 0) {
|
||||
final long subCode = suffixesReader.readVLong();
|
||||
//if (DEBUG) System.out.println(" subCode=" + subCode);
|
||||
if (targetSubCode == subCode) {
|
||||
//if (DEBUG) System.out.println(" match!");
|
||||
lastSubFP = subFP;
|
||||
return;
|
||||
}
|
||||
} else {
|
||||
state.termBlockOrd++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// NOTE: sets startBytePos/suffix as a side effect
|
||||
public SeekStatus scanToTerm(BytesRef target, boolean exactOnly) throws IOException {
|
||||
return isLeafBlock ? scanToTermLeaf(target, exactOnly) : scanToTermNonLeaf(target, exactOnly);
|
||||
}
|
||||
|
||||
private int startBytePos;
|
||||
private int suffix;
|
||||
private long subCode;
|
||||
|
||||
// Target's prefix matches this block's prefix; we
|
||||
// scan the entries check if the suffix matches.
|
||||
public SeekStatus scanToTermLeaf(BytesRef target, boolean exactOnly) throws IOException {
|
||||
|
||||
// if (DEBUG) System.out.println(" scanToTermLeaf: block fp=" + fp + " prefix=" + prefix + " nextEnt=" + nextEnt + " (of " + entCount + ") target=" + brToString(target) + " term=" + brToString(term));
|
||||
|
||||
assert nextEnt != -1;
|
||||
|
||||
termExists = true;
|
||||
subCode = 0;
|
||||
|
||||
if (nextEnt == entCount) {
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
}
|
||||
return SeekStatus.END;
|
||||
}
|
||||
|
||||
assert prefixMatches(target);
|
||||
|
||||
// Loop over each entry (term or sub-block) in this block:
|
||||
//nextTerm: while(nextEnt < entCount) {
|
||||
nextTerm: while (true) {
|
||||
nextEnt++;
|
||||
|
||||
suffix = suffixesReader.readVInt();
|
||||
|
||||
// if (DEBUG) {
|
||||
// BytesRef suffixBytesRef = new BytesRef();
|
||||
// suffixBytesRef.bytes = suffixBytes;
|
||||
// suffixBytesRef.offset = suffixesReader.getPosition();
|
||||
// suffixBytesRef.length = suffix;
|
||||
// System.out.println(" cycle: term " + (nextEnt-1) + " (of " + entCount + ") suffix=" + brToString(suffixBytesRef));
|
||||
// }
|
||||
|
||||
final int termLen = prefix + suffix;
|
||||
startBytePos = suffixesReader.getPosition();
|
||||
suffixesReader.skipBytes(suffix);
|
||||
|
||||
final int targetLimit = target.offset + (target.length < termLen ? target.length : termLen);
|
||||
int targetPos = target.offset + prefix;
|
||||
|
||||
// Loop over bytes in the suffix, comparing to
|
||||
// the target
|
||||
int bytePos = startBytePos;
|
||||
while(true) {
|
||||
final int cmp;
|
||||
final boolean stop;
|
||||
if (targetPos < targetLimit) {
|
||||
cmp = (suffixBytes[bytePos++]&0xFF) - (target.bytes[targetPos++]&0xFF);
|
||||
stop = false;
|
||||
} else {
|
||||
assert targetPos == targetLimit;
|
||||
cmp = termLen - target.length;
|
||||
stop = true;
|
||||
}
|
||||
|
||||
if (cmp < 0) {
|
||||
// Current entry is still before the target;
|
||||
// keep scanning
|
||||
|
||||
if (nextEnt == entCount) {
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
}
|
||||
// We are done scanning this block
|
||||
break nextTerm;
|
||||
} else {
|
||||
continue nextTerm;
|
||||
}
|
||||
} else if (cmp > 0) {
|
||||
|
||||
// Done! Current entry is after target --
|
||||
// return NOT_FOUND:
|
||||
fillTerm();
|
||||
|
||||
if (!exactOnly && !termExists) {
|
||||
// We are on a sub-block, and caller wants
|
||||
// us to position to the next term after
|
||||
// the target, so we must recurse into the
|
||||
// sub-frame(s):
|
||||
currentFrame = pushFrame(null, currentFrame.lastSubFP, termLen);
|
||||
currentFrame.loadBlock();
|
||||
while (currentFrame.next()) {
|
||||
currentFrame = pushFrame(null, currentFrame.lastSubFP, term.length);
|
||||
currentFrame.loadBlock();
|
||||
}
|
||||
}
|
||||
|
||||
//if (DEBUG) System.out.println(" not found");
|
||||
return SeekStatus.NOT_FOUND;
|
||||
} else if (stop) {
|
||||
// Exact match!
|
||||
|
||||
// This cannot be a sub-block because we
|
||||
// would have followed the index to this
|
||||
// sub-block from the start:
|
||||
|
||||
assert termExists;
|
||||
fillTerm();
|
||||
//if (DEBUG) System.out.println(" found!");
|
||||
return SeekStatus.FOUND;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// It is possible (and OK) that terms index pointed us
|
||||
// at this block, but, we scanned the entire block and
|
||||
// did not find the term to position to. This happens
|
||||
// when the target is after the last term in the block
|
||||
// (but, before the next term in the index). EG
|
||||
// target could be foozzz, and terms index pointed us
|
||||
// to the foo* block, but the last term in this block
|
||||
// was fooz (and, eg, first term in the next block will
|
||||
// bee fop).
|
||||
//if (DEBUG) System.out.println(" block end");
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
}
|
||||
|
||||
// TODO: not consistent that in the
|
||||
// not-exact case we don't next() into the next
|
||||
// frame here
|
||||
return SeekStatus.END;
|
||||
}
|
||||
|
||||
// Target's prefix matches this block's prefix; we
|
||||
// scan the entries check if the suffix matches.
|
||||
public SeekStatus scanToTermNonLeaf(BytesRef target, boolean exactOnly) throws IOException {
|
||||
|
||||
//if (DEBUG) System.out.println(" scanToTermNonLeaf: block fp=" + fp + " prefix=" + prefix + " nextEnt=" + nextEnt + " (of " + entCount + ") target=" + brToString(target) + " term=" + brToString(term));
|
||||
|
||||
assert nextEnt != -1;
|
||||
|
||||
if (nextEnt == entCount) {
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
termExists = subCode == 0;
|
||||
}
|
||||
return SeekStatus.END;
|
||||
}
|
||||
|
||||
assert prefixMatches(target);
|
||||
|
||||
// Loop over each entry (term or sub-block) in this block:
|
||||
//nextTerm: while(nextEnt < entCount) {
|
||||
nextTerm: while (true) {
|
||||
nextEnt++;
|
||||
|
||||
final int code = suffixesReader.readVInt();
|
||||
suffix = code >>> 1;
|
||||
// if (DEBUG) {
|
||||
// BytesRef suffixBytesRef = new BytesRef();
|
||||
// suffixBytesRef.bytes = suffixBytes;
|
||||
// suffixBytesRef.offset = suffixesReader.getPosition();
|
||||
// suffixBytesRef.length = suffix;
|
||||
// System.out.println(" cycle: " + ((code&1)==1 ? "sub-block" : "term") + " " + (nextEnt-1) + " (of " + entCount + ") suffix=" + brToString(suffixBytesRef));
|
||||
// }
|
||||
|
||||
termExists = (code & 1) == 0;
|
||||
final int termLen = prefix + suffix;
|
||||
startBytePos = suffixesReader.getPosition();
|
||||
suffixesReader.skipBytes(suffix);
|
||||
if (termExists) {
|
||||
state.termBlockOrd++;
|
||||
subCode = 0;
|
||||
} else {
|
||||
subCode = suffixesReader.readVLong();
|
||||
lastSubFP = fp - subCode;
|
||||
}
|
||||
|
||||
final int targetLimit = target.offset + (target.length < termLen ? target.length : termLen);
|
||||
int targetPos = target.offset + prefix;
|
||||
|
||||
// Loop over bytes in the suffix, comparing to
|
||||
// the target
|
||||
int bytePos = startBytePos;
|
||||
while(true) {
|
||||
final int cmp;
|
||||
final boolean stop;
|
||||
if (targetPos < targetLimit) {
|
||||
cmp = (suffixBytes[bytePos++]&0xFF) - (target.bytes[targetPos++]&0xFF);
|
||||
stop = false;
|
||||
} else {
|
||||
assert targetPos == targetLimit;
|
||||
cmp = termLen - target.length;
|
||||
stop = true;
|
||||
}
|
||||
|
||||
if (cmp < 0) {
|
||||
// Current entry is still before the target;
|
||||
// keep scanning
|
||||
|
||||
if (nextEnt == entCount) {
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
//termExists = true;
|
||||
}
|
||||
// We are done scanning this block
|
||||
break nextTerm;
|
||||
} else {
|
||||
continue nextTerm;
|
||||
}
|
||||
} else if (cmp > 0) {
|
||||
|
||||
// Done! Current entry is after target --
|
||||
// return NOT_FOUND:
|
||||
fillTerm();
|
||||
|
||||
if (!exactOnly && !termExists) {
|
||||
// We are on a sub-block, and caller wants
|
||||
// us to position to the next term after
|
||||
// the target, so we must recurse into the
|
||||
// sub-frame(s):
|
||||
currentFrame = pushFrame(null, currentFrame.lastSubFP, termLen);
|
||||
currentFrame.loadBlock();
|
||||
while (currentFrame.next()) {
|
||||
currentFrame = pushFrame(null, currentFrame.lastSubFP, term.length);
|
||||
currentFrame.loadBlock();
|
||||
}
|
||||
}
|
||||
|
||||
//if (DEBUG) System.out.println(" not found");
|
||||
return SeekStatus.NOT_FOUND;
|
||||
} else if (stop) {
|
||||
// Exact match!
|
||||
|
||||
// This cannot be a sub-block because we
|
||||
// would have followed the index to this
|
||||
// sub-block from the start:
|
||||
|
||||
assert termExists;
|
||||
fillTerm();
|
||||
//if (DEBUG) System.out.println(" found!");
|
||||
return SeekStatus.FOUND;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// It is possible (and OK) that terms index pointed us
|
||||
// at this block, but, we scanned the entire block and
|
||||
// did not find the term to position to. This happens
|
||||
// when the target is after the last term in the block
|
||||
// (but, before the next term in the index). EG
|
||||
// target could be foozzz, and terms index pointed us
|
||||
// to the foo* block, but the last term in this block
|
||||
// was fooz (and, eg, first term in the next block will
|
||||
// bee fop).
|
||||
//if (DEBUG) System.out.println(" block end");
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
}
|
||||
|
||||
// TODO: not consistent that in the
|
||||
// not-exact case we don't next() into the next
|
||||
// frame here
|
||||
return SeekStatus.END;
|
||||
}
|
||||
|
||||
private void fillTerm() {
|
||||
final int termLength = prefix + suffix;
|
||||
term.length = prefix + suffix;
|
||||
if (term.bytes.length < termLength) {
|
||||
term.grow(termLength);
|
||||
}
|
||||
System.arraycopy(suffixBytes, startBytePos, term.bytes, prefix, suffix);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,745 @@
|
|||
package org.apache.lucene.codecs.blocktree;
|
||||
|
||||
/*
|
||||
* Licensed to the Apache Software Foundation (ASF) under one or more
|
||||
* contributor license agreements. See the NOTICE file distributed with
|
||||
* this work for additional information regarding copyright ownership.
|
||||
* The ASF licenses this file to You under the Apache License, Version 2.0
|
||||
* (the "License"); you may not use this file except in compliance with
|
||||
* the License. You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
import java.io.IOException;
|
||||
|
||||
import org.apache.lucene.codecs.BlockTermState;
|
||||
import org.apache.lucene.index.FieldInfo.IndexOptions;
|
||||
import org.apache.lucene.index.TermsEnum.SeekStatus;
|
||||
import org.apache.lucene.store.ByteArrayDataInput;
|
||||
import org.apache.lucene.util.ArrayUtil;
|
||||
import org.apache.lucene.util.BytesRef;
|
||||
import org.apache.lucene.util.fst.FST;
|
||||
|
||||
final class SegmentTermsEnumFrame {
|
||||
// Our index in stack[]:
|
||||
final int ord;
|
||||
|
||||
boolean hasTerms;
|
||||
boolean hasTermsOrig;
|
||||
boolean isFloor;
|
||||
|
||||
FST.Arc<BytesRef> arc;
|
||||
|
||||
// File pointer where this block was loaded from
|
||||
long fp;
|
||||
long fpOrig;
|
||||
long fpEnd;
|
||||
|
||||
byte[] suffixBytes = new byte[128];
|
||||
final ByteArrayDataInput suffixesReader = new ByteArrayDataInput();
|
||||
|
||||
byte[] statBytes = new byte[64];
|
||||
final ByteArrayDataInput statsReader = new ByteArrayDataInput();
|
||||
|
||||
byte[] floorData = new byte[32];
|
||||
final ByteArrayDataInput floorDataReader = new ByteArrayDataInput();
|
||||
|
||||
// Length of prefix shared by all terms in this block
|
||||
int prefix;
|
||||
|
||||
// Number of entries (term or sub-block) in this block
|
||||
int entCount;
|
||||
|
||||
// Which term we will next read, or -1 if the block
|
||||
// isn't loaded yet
|
||||
int nextEnt;
|
||||
|
||||
// True if this block is either not a floor block,
|
||||
// or, it's the last sub-block of a floor block
|
||||
boolean isLastInFloor;
|
||||
|
||||
// True if all entries are terms
|
||||
boolean isLeafBlock;
|
||||
|
||||
long lastSubFP;
|
||||
|
||||
int nextFloorLabel;
|
||||
int numFollowFloorBlocks;
|
||||
|
||||
// Next term to decode metaData; we decode metaData
|
||||
// lazily so that scanning to find the matching term is
|
||||
// fast and only if you find a match and app wants the
|
||||
// stats or docs/positions enums, will we decode the
|
||||
// metaData
|
||||
int metaDataUpto;
|
||||
|
||||
final BlockTermState state;
|
||||
|
||||
// metadata buffer, holding monotonic values
|
||||
public long[] longs;
|
||||
// metadata buffer, holding general values
|
||||
public byte[] bytes;
|
||||
ByteArrayDataInput bytesReader;
|
||||
|
||||
private final SegmentTermsEnum ste;
|
||||
|
||||
public SegmentTermsEnumFrame(SegmentTermsEnum ste, int ord) throws IOException {
|
||||
this.ste = ste;
|
||||
this.ord = ord;
|
||||
this.state = ste.fr.parent.postingsReader.newTermState();
|
||||
this.state.totalTermFreq = -1;
|
||||
this.longs = new long[ste.fr.longsSize];
|
||||
}
|
||||
|
||||
public void setFloorData(ByteArrayDataInput in, BytesRef source) {
|
||||
final int numBytes = source.length - (in.getPosition() - source.offset);
|
||||
if (numBytes > floorData.length) {
|
||||
floorData = new byte[ArrayUtil.oversize(numBytes, 1)];
|
||||
}
|
||||
System.arraycopy(source.bytes, source.offset+in.getPosition(), floorData, 0, numBytes);
|
||||
floorDataReader.reset(floorData, 0, numBytes);
|
||||
numFollowFloorBlocks = floorDataReader.readVInt();
|
||||
nextFloorLabel = floorDataReader.readByte() & 0xff;
|
||||
//if (DEBUG) {
|
||||
//System.out.println(" setFloorData fpOrig=" + fpOrig + " bytes=" + new BytesRef(source.bytes, source.offset + in.getPosition(), numBytes) + " numFollowFloorBlocks=" + numFollowFloorBlocks + " nextFloorLabel=" + toHex(nextFloorLabel));
|
||||
//}
|
||||
}
|
||||
|
||||
public int getTermBlockOrd() {
|
||||
return isLeafBlock ? nextEnt : state.termBlockOrd;
|
||||
}
|
||||
|
||||
void loadNextFloorBlock() throws IOException {
|
||||
//if (DEBUG) {
|
||||
//System.out.println(" loadNextFloorBlock fp=" + fp + " fpEnd=" + fpEnd);
|
||||
//}
|
||||
assert arc == null || isFloor: "arc=" + arc + " isFloor=" + isFloor;
|
||||
fp = fpEnd;
|
||||
nextEnt = -1;
|
||||
loadBlock();
|
||||
}
|
||||
|
||||
/* Does initial decode of next block of terms; this
|
||||
doesn't actually decode the docFreq, totalTermFreq,
|
||||
postings details (frq/prx offset, etc.) metadata;
|
||||
it just loads them as byte[] blobs which are then
|
||||
decoded on-demand if the metadata is ever requested
|
||||
for any term in this block. This enables terms-only
|
||||
intensive consumes (eg certain MTQs, respelling) to
|
||||
not pay the price of decoding metadata they won't
|
||||
use. */
|
||||
void loadBlock() throws IOException {
|
||||
|
||||
// Clone the IndexInput lazily, so that consumers
|
||||
// that just pull a TermsEnum to
|
||||
// seekExact(TermState) don't pay this cost:
|
||||
ste.initIndexInput();
|
||||
|
||||
if (nextEnt != -1) {
|
||||
// Already loaded
|
||||
return;
|
||||
}
|
||||
//System.out.println("blc=" + blockLoadCount);
|
||||
|
||||
ste.in.seek(fp);
|
||||
int code = ste.in.readVInt();
|
||||
entCount = code >>> 1;
|
||||
assert entCount > 0;
|
||||
isLastInFloor = (code & 1) != 0;
|
||||
assert arc == null || (isLastInFloor || isFloor);
|
||||
|
||||
// TODO: if suffixes were stored in random-access
|
||||
// array structure, then we could do binary search
|
||||
// instead of linear scan to find target term; eg
|
||||
// we could have simple array of offsets
|
||||
|
||||
// term suffixes:
|
||||
code = ste.in.readVInt();
|
||||
isLeafBlock = (code & 1) != 0;
|
||||
int numBytes = code >>> 1;
|
||||
if (suffixBytes.length < numBytes) {
|
||||
suffixBytes = new byte[ArrayUtil.oversize(numBytes, 1)];
|
||||
}
|
||||
ste.in.readBytes(suffixBytes, 0, numBytes);
|
||||
suffixesReader.reset(suffixBytes, 0, numBytes);
|
||||
|
||||
/*if (DEBUG) {
|
||||
if (arc == null) {
|
||||
System.out.println(" loadBlock (next) fp=" + fp + " entCount=" + entCount + " prefixLen=" + prefix + " isLastInFloor=" + isLastInFloor + " leaf?=" + isLeafBlock);
|
||||
} else {
|
||||
System.out.println(" loadBlock (seek) fp=" + fp + " entCount=" + entCount + " prefixLen=" + prefix + " hasTerms?=" + hasTerms + " isFloor?=" + isFloor + " isLastInFloor=" + isLastInFloor + " leaf?=" + isLeafBlock);
|
||||
}
|
||||
}*/
|
||||
|
||||
// stats
|
||||
numBytes = ste.in.readVInt();
|
||||
if (statBytes.length < numBytes) {
|
||||
statBytes = new byte[ArrayUtil.oversize(numBytes, 1)];
|
||||
}
|
||||
ste.in.readBytes(statBytes, 0, numBytes);
|
||||
statsReader.reset(statBytes, 0, numBytes);
|
||||
metaDataUpto = 0;
|
||||
|
||||
state.termBlockOrd = 0;
|
||||
nextEnt = 0;
|
||||
lastSubFP = -1;
|
||||
|
||||
// TODO: we could skip this if !hasTerms; but
|
||||
// that's rare so won't help much
|
||||
// metadata
|
||||
numBytes = ste.in.readVInt();
|
||||
if (bytes == null) {
|
||||
bytes = new byte[ArrayUtil.oversize(numBytes, 1)];
|
||||
bytesReader = new ByteArrayDataInput();
|
||||
} else if (bytes.length < numBytes) {
|
||||
bytes = new byte[ArrayUtil.oversize(numBytes, 1)];
|
||||
}
|
||||
ste.in.readBytes(bytes, 0, numBytes);
|
||||
bytesReader.reset(bytes, 0, numBytes);
|
||||
|
||||
|
||||
// Sub-blocks of a single floor block are always
|
||||
// written one after another -- tail recurse:
|
||||
fpEnd = ste.in.getFilePointer();
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" fpEnd=" + fpEnd);
|
||||
// }
|
||||
}
|
||||
|
||||
void rewind() {
|
||||
|
||||
// Force reload:
|
||||
fp = fpOrig;
|
||||
nextEnt = -1;
|
||||
hasTerms = hasTermsOrig;
|
||||
if (isFloor) {
|
||||
floorDataReader.rewind();
|
||||
numFollowFloorBlocks = floorDataReader.readVInt();
|
||||
nextFloorLabel = floorDataReader.readByte() & 0xff;
|
||||
}
|
||||
|
||||
/*
|
||||
//System.out.println("rewind");
|
||||
// Keeps the block loaded, but rewinds its state:
|
||||
if (nextEnt > 0 || fp != fpOrig) {
|
||||
if (DEBUG) {
|
||||
System.out.println(" rewind frame ord=" + ord + " fpOrig=" + fpOrig + " fp=" + fp + " hasTerms?=" + hasTerms + " isFloor?=" + isFloor + " nextEnt=" + nextEnt + " prefixLen=" + prefix);
|
||||
}
|
||||
if (fp != fpOrig) {
|
||||
fp = fpOrig;
|
||||
nextEnt = -1;
|
||||
} else {
|
||||
nextEnt = 0;
|
||||
}
|
||||
hasTerms = hasTermsOrig;
|
||||
if (isFloor) {
|
||||
floorDataReader.rewind();
|
||||
numFollowFloorBlocks = floorDataReader.readVInt();
|
||||
nextFloorLabel = floorDataReader.readByte() & 0xff;
|
||||
}
|
||||
assert suffixBytes != null;
|
||||
suffixesReader.rewind();
|
||||
assert statBytes != null;
|
||||
statsReader.rewind();
|
||||
metaDataUpto = 0;
|
||||
state.termBlockOrd = 0;
|
||||
// TODO: skip this if !hasTerms? Then postings
|
||||
// impl wouldn't have to write useless 0 byte
|
||||
postingsReader.resetTermsBlock(fieldInfo, state);
|
||||
lastSubFP = -1;
|
||||
} else if (DEBUG) {
|
||||
System.out.println(" skip rewind fp=" + fp + " fpOrig=" + fpOrig + " nextEnt=" + nextEnt + " ord=" + ord);
|
||||
}
|
||||
*/
|
||||
}
|
||||
|
||||
public boolean next() {
|
||||
return isLeafBlock ? nextLeaf() : nextNonLeaf();
|
||||
}
|
||||
|
||||
// Decodes next entry; returns true if it's a sub-block
|
||||
public boolean nextLeaf() {
|
||||
//if (DEBUG) System.out.println(" frame.next ord=" + ord + " nextEnt=" + nextEnt + " entCount=" + entCount);
|
||||
assert nextEnt != -1 && nextEnt < entCount: "nextEnt=" + nextEnt + " entCount=" + entCount + " fp=" + fp;
|
||||
nextEnt++;
|
||||
suffix = suffixesReader.readVInt();
|
||||
startBytePos = suffixesReader.getPosition();
|
||||
ste.term.length = prefix + suffix;
|
||||
if (ste.term.bytes.length < ste.term.length) {
|
||||
ste.term.grow(ste.term.length);
|
||||
}
|
||||
suffixesReader.readBytes(ste.term.bytes, prefix, suffix);
|
||||
// A normal term
|
||||
ste.termExists = true;
|
||||
return false;
|
||||
}
|
||||
|
||||
public boolean nextNonLeaf() {
|
||||
//if (DEBUG) System.out.println(" frame.next ord=" + ord + " nextEnt=" + nextEnt + " entCount=" + entCount);
|
||||
assert nextEnt != -1 && nextEnt < entCount: "nextEnt=" + nextEnt + " entCount=" + entCount + " fp=" + fp;
|
||||
nextEnt++;
|
||||
final int code = suffixesReader.readVInt();
|
||||
suffix = code >>> 1;
|
||||
startBytePos = suffixesReader.getPosition();
|
||||
ste.term.length = prefix + suffix;
|
||||
if (ste.term.bytes.length < ste.term.length) {
|
||||
ste.term.grow(ste.term.length);
|
||||
}
|
||||
suffixesReader.readBytes(ste.term.bytes, prefix, suffix);
|
||||
if ((code & 1) == 0) {
|
||||
// A normal term
|
||||
ste.termExists = true;
|
||||
subCode = 0;
|
||||
state.termBlockOrd++;
|
||||
return false;
|
||||
} else {
|
||||
// A sub-block; make sub-FP absolute:
|
||||
ste.termExists = false;
|
||||
subCode = suffixesReader.readVLong();
|
||||
lastSubFP = fp - subCode;
|
||||
//if (DEBUG) {
|
||||
//System.out.println(" lastSubFP=" + lastSubFP);
|
||||
//}
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
// TODO: make this array'd so we can do bin search?
|
||||
// likely not worth it? need to measure how many
|
||||
// floor blocks we "typically" get
|
||||
public void scanToFloorFrame(BytesRef target) {
|
||||
|
||||
if (!isFloor || target.length <= prefix) {
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" scanToFloorFrame skip: isFloor=" + isFloor + " target.length=" + target.length + " vs prefix=" + prefix);
|
||||
// }
|
||||
return;
|
||||
}
|
||||
|
||||
final int targetLabel = target.bytes[target.offset + prefix] & 0xFF;
|
||||
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" scanToFloorFrame fpOrig=" + fpOrig + " targetLabel=" + toHex(targetLabel) + " vs nextFloorLabel=" + toHex(nextFloorLabel) + " numFollowFloorBlocks=" + numFollowFloorBlocks);
|
||||
// }
|
||||
|
||||
if (targetLabel < nextFloorLabel) {
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" already on correct block");
|
||||
// }
|
||||
return;
|
||||
}
|
||||
|
||||
assert numFollowFloorBlocks != 0;
|
||||
|
||||
long newFP = fpOrig;
|
||||
while (true) {
|
||||
final long code = floorDataReader.readVLong();
|
||||
newFP = fpOrig + (code >>> 1);
|
||||
hasTerms = (code & 1) != 0;
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" label=" + toHex(nextFloorLabel) + " fp=" + newFP + " hasTerms?=" + hasTerms + " numFollowFloor=" + numFollowFloorBlocks);
|
||||
// }
|
||||
|
||||
isLastInFloor = numFollowFloorBlocks == 1;
|
||||
numFollowFloorBlocks--;
|
||||
|
||||
if (isLastInFloor) {
|
||||
nextFloorLabel = 256;
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" stop! last block nextFloorLabel=" + toHex(nextFloorLabel));
|
||||
// }
|
||||
break;
|
||||
} else {
|
||||
nextFloorLabel = floorDataReader.readByte() & 0xff;
|
||||
if (targetLabel < nextFloorLabel) {
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" stop! nextFloorLabel=" + toHex(nextFloorLabel));
|
||||
// }
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (newFP != fp) {
|
||||
// Force re-load of the block:
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" force switch to fp=" + newFP + " oldFP=" + fp);
|
||||
// }
|
||||
nextEnt = -1;
|
||||
fp = newFP;
|
||||
} else {
|
||||
// if (DEBUG) {
|
||||
// System.out.println(" stay on same fp=" + newFP);
|
||||
// }
|
||||
}
|
||||
}
|
||||
|
||||
public void decodeMetaData() throws IOException {
|
||||
|
||||
//if (DEBUG) System.out.println("\nBTTR.decodeMetadata seg=" + segment + " mdUpto=" + metaDataUpto + " vs termBlockOrd=" + state.termBlockOrd);
|
||||
|
||||
// lazily catch up on metadata decode:
|
||||
final int limit = getTermBlockOrd();
|
||||
boolean absolute = metaDataUpto == 0;
|
||||
assert limit > 0;
|
||||
|
||||
// TODO: better API would be "jump straight to term=N"???
|
||||
while (metaDataUpto < limit) {
|
||||
|
||||
// TODO: we could make "tiers" of metadata, ie,
|
||||
// decode docFreq/totalTF but don't decode postings
|
||||
// metadata; this way caller could get
|
||||
// docFreq/totalTF w/o paying decode cost for
|
||||
// postings
|
||||
|
||||
// TODO: if docFreq were bulk decoded we could
|
||||
// just skipN here:
|
||||
|
||||
// stats
|
||||
state.docFreq = statsReader.readVInt();
|
||||
//if (DEBUG) System.out.println(" dF=" + state.docFreq);
|
||||
if (ste.fr.fieldInfo.getIndexOptions() != IndexOptions.DOCS_ONLY) {
|
||||
state.totalTermFreq = state.docFreq + statsReader.readVLong();
|
||||
//if (DEBUG) System.out.println(" totTF=" + state.totalTermFreq);
|
||||
}
|
||||
// metadata
|
||||
for (int i = 0; i < ste.fr.longsSize; i++) {
|
||||
longs[i] = bytesReader.readVLong();
|
||||
}
|
||||
ste.fr.parent.postingsReader.decodeTerm(longs, bytesReader, ste.fr.fieldInfo, state, absolute);
|
||||
|
||||
metaDataUpto++;
|
||||
absolute = false;
|
||||
}
|
||||
state.termBlockOrd = metaDataUpto;
|
||||
}
|
||||
|
||||
// Used only by assert
|
||||
private boolean prefixMatches(BytesRef target) {
|
||||
for(int bytePos=0;bytePos<prefix;bytePos++) {
|
||||
if (target.bytes[target.offset + bytePos] != ste.term.bytes[bytePos]) {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
// Scans to sub-block that has this target fp; only
|
||||
// called by next(); NOTE: does not set
|
||||
// startBytePos/suffix as a side effect
|
||||
public void scanToSubBlock(long subFP) {
|
||||
assert !isLeafBlock;
|
||||
//if (DEBUG) System.out.println(" scanToSubBlock fp=" + fp + " subFP=" + subFP + " entCount=" + entCount + " lastSubFP=" + lastSubFP);
|
||||
//assert nextEnt == 0;
|
||||
if (lastSubFP == subFP) {
|
||||
//if (DEBUG) System.out.println(" already positioned");
|
||||
return;
|
||||
}
|
||||
assert subFP < fp : "fp=" + fp + " subFP=" + subFP;
|
||||
final long targetSubCode = fp - subFP;
|
||||
//if (DEBUG) System.out.println(" targetSubCode=" + targetSubCode);
|
||||
while(true) {
|
||||
assert nextEnt < entCount;
|
||||
nextEnt++;
|
||||
final int code = suffixesReader.readVInt();
|
||||
suffixesReader.skipBytes(isLeafBlock ? code : code >>> 1);
|
||||
//if (DEBUG) System.out.println(" " + nextEnt + " (of " + entCount + ") ent isSubBlock=" + ((code&1)==1));
|
||||
if ((code & 1) != 0) {
|
||||
final long subCode = suffixesReader.readVLong();
|
||||
//if (DEBUG) System.out.println(" subCode=" + subCode);
|
||||
if (targetSubCode == subCode) {
|
||||
//if (DEBUG) System.out.println(" match!");
|
||||
lastSubFP = subFP;
|
||||
return;
|
||||
}
|
||||
} else {
|
||||
state.termBlockOrd++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// NOTE: sets startBytePos/suffix as a side effect
|
||||
public SeekStatus scanToTerm(BytesRef target, boolean exactOnly) throws IOException {
|
||||
return isLeafBlock ? scanToTermLeaf(target, exactOnly) : scanToTermNonLeaf(target, exactOnly);
|
||||
}
|
||||
|
||||
private int startBytePos;
|
||||
private int suffix;
|
||||
private long subCode;
|
||||
|
||||
// Target's prefix matches this block's prefix; we
|
||||
// scan the entries check if the suffix matches.
|
||||
public SeekStatus scanToTermLeaf(BytesRef target, boolean exactOnly) throws IOException {
|
||||
|
||||
// if (DEBUG) System.out.println(" scanToTermLeaf: block fp=" + fp + " prefix=" + prefix + " nextEnt=" + nextEnt + " (of " + entCount + ") target=" + brToString(target) + " term=" + brToString(term));
|
||||
|
||||
assert nextEnt != -1;
|
||||
|
||||
ste.termExists = true;
|
||||
subCode = 0;
|
||||
|
||||
if (nextEnt == entCount) {
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
}
|
||||
return SeekStatus.END;
|
||||
}
|
||||
|
||||
assert prefixMatches(target);
|
||||
|
||||
// Loop over each entry (term or sub-block) in this block:
|
||||
//nextTerm: while(nextEnt < entCount) {
|
||||
nextTerm: while (true) {
|
||||
nextEnt++;
|
||||
|
||||
suffix = suffixesReader.readVInt();
|
||||
|
||||
// if (DEBUG) {
|
||||
// BytesRef suffixBytesRef = new BytesRef();
|
||||
// suffixBytesRef.bytes = suffixBytes;
|
||||
// suffixBytesRef.offset = suffixesReader.getPosition();
|
||||
// suffixBytesRef.length = suffix;
|
||||
// System.out.println(" cycle: term " + (nextEnt-1) + " (of " + entCount + ") suffix=" + brToString(suffixBytesRef));
|
||||
// }
|
||||
|
||||
final int termLen = prefix + suffix;
|
||||
startBytePos = suffixesReader.getPosition();
|
||||
suffixesReader.skipBytes(suffix);
|
||||
|
||||
final int targetLimit = target.offset + (target.length < termLen ? target.length : termLen);
|
||||
int targetPos = target.offset + prefix;
|
||||
|
||||
// Loop over bytes in the suffix, comparing to
|
||||
// the target
|
||||
int bytePos = startBytePos;
|
||||
while(true) {
|
||||
final int cmp;
|
||||
final boolean stop;
|
||||
if (targetPos < targetLimit) {
|
||||
cmp = (suffixBytes[bytePos++]&0xFF) - (target.bytes[targetPos++]&0xFF);
|
||||
stop = false;
|
||||
} else {
|
||||
assert targetPos == targetLimit;
|
||||
cmp = termLen - target.length;
|
||||
stop = true;
|
||||
}
|
||||
|
||||
if (cmp < 0) {
|
||||
// Current entry is still before the target;
|
||||
// keep scanning
|
||||
|
||||
if (nextEnt == entCount) {
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
}
|
||||
// We are done scanning this block
|
||||
break nextTerm;
|
||||
} else {
|
||||
continue nextTerm;
|
||||
}
|
||||
} else if (cmp > 0) {
|
||||
|
||||
// Done! Current entry is after target --
|
||||
// return NOT_FOUND:
|
||||
fillTerm();
|
||||
|
||||
if (!exactOnly && !ste.termExists) {
|
||||
// We are on a sub-block, and caller wants
|
||||
// us to position to the next term after
|
||||
// the target, so we must recurse into the
|
||||
// sub-frame(s):
|
||||
ste.currentFrame = ste.pushFrame(null, ste.currentFrame.lastSubFP, termLen);
|
||||
ste.currentFrame.loadBlock();
|
||||
while (ste.currentFrame.next()) {
|
||||
ste.currentFrame = ste.pushFrame(null, ste.currentFrame.lastSubFP, ste.term.length);
|
||||
ste.currentFrame.loadBlock();
|
||||
}
|
||||
}
|
||||
|
||||
//if (DEBUG) System.out.println(" not found");
|
||||
return SeekStatus.NOT_FOUND;
|
||||
} else if (stop) {
|
||||
// Exact match!
|
||||
|
||||
// This cannot be a sub-block because we
|
||||
// would have followed the index to this
|
||||
// sub-block from the start:
|
||||
|
||||
assert ste.termExists;
|
||||
fillTerm();
|
||||
//if (DEBUG) System.out.println(" found!");
|
||||
return SeekStatus.FOUND;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// It is possible (and OK) that terms index pointed us
|
||||
// at this block, but, we scanned the entire block and
|
||||
// did not find the term to position to. This happens
|
||||
// when the target is after the last term in the block
|
||||
// (but, before the next term in the index). EG
|
||||
// target could be foozzz, and terms index pointed us
|
||||
// to the foo* block, but the last term in this block
|
||||
// was fooz (and, eg, first term in the next block will
|
||||
// bee fop).
|
||||
//if (DEBUG) System.out.println(" block end");
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
}
|
||||
|
||||
// TODO: not consistent that in the
|
||||
// not-exact case we don't next() into the next
|
||||
// frame here
|
||||
return SeekStatus.END;
|
||||
}
|
||||
|
||||
// Target's prefix matches this block's prefix; we
|
||||
// scan the entries check if the suffix matches.
|
||||
public SeekStatus scanToTermNonLeaf(BytesRef target, boolean exactOnly) throws IOException {
|
||||
|
||||
//if (DEBUG) System.out.println(" scanToTermNonLeaf: block fp=" + fp + " prefix=" + prefix + " nextEnt=" + nextEnt + " (of " + entCount + ") target=" + brToString(target) + " term=" + brToString(term));
|
||||
|
||||
assert nextEnt != -1;
|
||||
|
||||
if (nextEnt == entCount) {
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
ste.termExists = subCode == 0;
|
||||
}
|
||||
return SeekStatus.END;
|
||||
}
|
||||
|
||||
assert prefixMatches(target);
|
||||
|
||||
// Loop over each entry (term or sub-block) in this block:
|
||||
//nextTerm: while(nextEnt < entCount) {
|
||||
nextTerm: while (true) {
|
||||
nextEnt++;
|
||||
|
||||
final int code = suffixesReader.readVInt();
|
||||
suffix = code >>> 1;
|
||||
// if (DEBUG) {
|
||||
// BytesRef suffixBytesRef = new BytesRef();
|
||||
// suffixBytesRef.bytes = suffixBytes;
|
||||
// suffixBytesRef.offset = suffixesReader.getPosition();
|
||||
// suffixBytesRef.length = suffix;
|
||||
// System.out.println(" cycle: " + ((code&1)==1 ? "sub-block" : "term") + " " + (nextEnt-1) + " (of " + entCount + ") suffix=" + brToString(suffixBytesRef));
|
||||
// }
|
||||
|
||||
ste.termExists = (code & 1) == 0;
|
||||
final int termLen = prefix + suffix;
|
||||
startBytePos = suffixesReader.getPosition();
|
||||
suffixesReader.skipBytes(suffix);
|
||||
if (ste.termExists) {
|
||||
state.termBlockOrd++;
|
||||
subCode = 0;
|
||||
} else {
|
||||
subCode = suffixesReader.readVLong();
|
||||
lastSubFP = fp - subCode;
|
||||
}
|
||||
|
||||
final int targetLimit = target.offset + (target.length < termLen ? target.length : termLen);
|
||||
int targetPos = target.offset + prefix;
|
||||
|
||||
// Loop over bytes in the suffix, comparing to
|
||||
// the target
|
||||
int bytePos = startBytePos;
|
||||
while(true) {
|
||||
final int cmp;
|
||||
final boolean stop;
|
||||
if (targetPos < targetLimit) {
|
||||
cmp = (suffixBytes[bytePos++]&0xFF) - (target.bytes[targetPos++]&0xFF);
|
||||
stop = false;
|
||||
} else {
|
||||
assert targetPos == targetLimit;
|
||||
cmp = termLen - target.length;
|
||||
stop = true;
|
||||
}
|
||||
|
||||
if (cmp < 0) {
|
||||
// Current entry is still before the target;
|
||||
// keep scanning
|
||||
|
||||
if (nextEnt == entCount) {
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
//termExists = true;
|
||||
}
|
||||
// We are done scanning this block
|
||||
break nextTerm;
|
||||
} else {
|
||||
continue nextTerm;
|
||||
}
|
||||
} else if (cmp > 0) {
|
||||
|
||||
// Done! Current entry is after target --
|
||||
// return NOT_FOUND:
|
||||
fillTerm();
|
||||
|
||||
if (!exactOnly && !ste.termExists) {
|
||||
// We are on a sub-block, and caller wants
|
||||
// us to position to the next term after
|
||||
// the target, so we must recurse into the
|
||||
// sub-frame(s):
|
||||
ste.currentFrame = ste.pushFrame(null, ste.currentFrame.lastSubFP, termLen);
|
||||
ste.currentFrame.loadBlock();
|
||||
while (ste.currentFrame.next()) {
|
||||
ste.currentFrame = ste.pushFrame(null, ste.currentFrame.lastSubFP, ste.term.length);
|
||||
ste.currentFrame.loadBlock();
|
||||
}
|
||||
}
|
||||
|
||||
//if (DEBUG) System.out.println(" not found");
|
||||
return SeekStatus.NOT_FOUND;
|
||||
} else if (stop) {
|
||||
// Exact match!
|
||||
|
||||
// This cannot be a sub-block because we
|
||||
// would have followed the index to this
|
||||
// sub-block from the start:
|
||||
|
||||
assert ste.termExists;
|
||||
fillTerm();
|
||||
//if (DEBUG) System.out.println(" found!");
|
||||
return SeekStatus.FOUND;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// It is possible (and OK) that terms index pointed us
|
||||
// at this block, but, we scanned the entire block and
|
||||
// did not find the term to position to. This happens
|
||||
// when the target is after the last term in the block
|
||||
// (but, before the next term in the index). EG
|
||||
// target could be foozzz, and terms index pointed us
|
||||
// to the foo* block, but the last term in this block
|
||||
// was fooz (and, eg, first term in the next block will
|
||||
// bee fop).
|
||||
//if (DEBUG) System.out.println(" block end");
|
||||
if (exactOnly) {
|
||||
fillTerm();
|
||||
}
|
||||
|
||||
// TODO: not consistent that in the
|
||||
// not-exact case we don't next() into the next
|
||||
// frame here
|
||||
return SeekStatus.END;
|
||||
}
|
||||
|
||||
private void fillTerm() {
|
||||
final int termLength = prefix + suffix;
|
||||
ste.term.length = prefix + suffix;
|
||||
if (ste.term.bytes.length < termLength) {
|
||||
ste.term.grow(termLength);
|
||||
}
|
||||
System.arraycopy(suffixBytes, startBytePos, ste.term.bytes, prefix, suffix);
|
||||
}
|
||||
}
|
||||
|
|
@ -100,7 +100,7 @@ public class Stats {
|
|||
this.field = field;
|
||||
}
|
||||
|
||||
void startBlock(SegmentTermsEnum.Frame frame, boolean isFloor) {
|
||||
void startBlock(SegmentTermsEnumFrame frame, boolean isFloor) {
|
||||
totalBlockCount++;
|
||||
if (isFloor) {
|
||||
if (frame.fp == frame.fpOrig) {
|
||||
|
|
@ -120,7 +120,7 @@ public class Stats {
|
|||
totalBlockStatsBytes += frame.statsReader.length();
|
||||
}
|
||||
|
||||
void endBlock(SegmentTermsEnum.Frame frame) {
|
||||
void endBlock(SegmentTermsEnumFrame frame) {
|
||||
final int termCount = frame.isLeafBlock ? frame.entCount : frame.state.termBlockOrd;
|
||||
final int subBlockCount = frame.entCount - termCount;
|
||||
totalTermCount += termCount;
|
||||
|
|
|
|||
Loading…
Reference in New Issue