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LUCENE-10329: Use computed mask for DirectMonotonicReader#get (#553) 

* use computed mask

* CHANGES

* use block mask for getBounds too

Co-authored-by: guofeng.my <guofeng.my@bytedance.com>
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gf2121 2021-12-22 19:03:12 +08:00 committed by GitHub
parent a94fbb79ac
commit c1fb591984
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2 changed files with 6 additions and 2 deletions
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2
lucene/CHANGES.txt
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@ -104,6 +104,8 @@ Improvements
Optimizations
---------------------
* LUCENE-10329: Use computed block mask for DirectMonotonicReader#get. (Guo Feng)
* LUCENE-10280: Optimize BKD leaves' doc IDs codec when they are continuous. (Guo Feng)
* LUCENE-10233: Store BKD leaves' doc IDs as bitset in some cases (typically for low cardinality fields

6
lucene/core/src/java/org/apache/lucene/util/packed/DirectMonotonicReader.java
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@ -127,6 +127,7 @@ public final class DirectMonotonicReader extends LongValues implements Accountab
}
private final int blockShift;
private final long blockMask;
private final LongValues[] readers;
private final long[] mins;
private final float[] avgs;
@ -136,6 +137,7 @@ public final class DirectMonotonicReader extends LongValues implements Accountab
private DirectMonotonicReader(
int blockShift, LongValues[] readers, long[] mins, float[] avgs, byte[] bpvs) {
this.blockShift = blockShift;
this.blockMask = (1L << blockShift) - 1;
this.readers = readers;
this.mins = mins;
this.avgs = avgs;
@ -157,7 +159,7 @@ public final class DirectMonotonicReader extends LongValues implements Accountab
@Override
public long get(long index) {
final int block = (int) (index >>> blockShift);
final long blockIndex = index & ((1 << blockShift) - 1);
final long blockIndex = index & blockMask;
final long delta = readers[block].get(blockIndex);
return mins[block] + (long) (avgs[block] * blockIndex) + delta;
}
@ -165,7 +167,7 @@ public final class DirectMonotonicReader extends LongValues implements Accountab
/** Get lower/upper bounds for the value at a given index without hitting the direct reader. */
private long[] getBounds(long index) {
final int block = Math.toIntExact(index >>> blockShift);
final long blockIndex = index & ((1 << blockShift) - 1);
final long blockIndex = index & blockMask;
final long lowerBound = mins[block] + (long) (avgs[block] * blockIndex);
final long upperBound = lowerBound + (1L << bpvs[block]) - 1;
if (bpvs[block] == 64 || upperBound < lowerBound) { // overflow