Adds rewrite phase to aggregations (#25495)
* Adds rewrite phase to aggregations This change adds aggregations to the rewrite performed by the `SearchSourceBuilder`. This means that `AggregationBuilder`s are able to implement a `rewrite()` method where they can return a new `AggregationBuilder` which is functionally the same but in a more primitive form. This is exactly analogous to the rewrite done by the `QueryBuilder`s. The first aggregation to implement the rewrite are the filter and filters aggregations so they can rewrite the filters they contain. Closes #17676 * Removes rewrite from PipelineAggregationBuilder Rewrite is based on shard level information. Since pipeline aggregation are run in the reduce phase it doesn’t make sense to rewrite them on the shards. In fact eventually we shouldn’t be transporting them to the shards at all and should be retaining them on the coordinating node for execution in the reduce phase * Addresses review comments * addresses more review comments * Fixed imports
This commit is contained in:
Colin Goodheart-Smithe
GitHub
parent
1c4ef0d214
commit
41abccf6c5
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@ -118,7 +118,7 @@ public abstract class AbstractAggregationBuilder<AB extends AbstractAggregationB
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@Override
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public Map<String, Object> getMetaData() {
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return Collections.unmodifiableMap(metaData);
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return metaData == null ? Collections.emptyMap() : Collections.unmodifiableMap(metaData);
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}
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@Override
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@ -24,6 +24,7 @@ import org.elasticsearch.common.ParseField;
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import org.elasticsearch.common.io.stream.NamedWriteable;
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import org.elasticsearch.common.xcontent.ToXContent;
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import org.elasticsearch.common.xcontent.XContentParser;
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import org.elasticsearch.index.query.QueryRewriteContext;
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import org.elasticsearch.search.internal.SearchContext;
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import java.io.IOException;
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@ -96,6 +97,44 @@ public abstract class AggregationBuilder
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@Override
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public abstract AggregationBuilder subAggregations(AggregatorFactories.Builder subFactories);
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public final AggregationBuilder rewrite(QueryRewriteContext context) throws IOException {
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AggregationBuilder rewritten = doRewrite(context);
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if (rewritten == this) {
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return rewritten;
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}
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if (getMetaData() != null && rewritten.getMetaData() == null) {
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rewritten.setMetaData(getMetaData());
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}
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AggregatorFactories.Builder rewrittenSubAggs = factoriesBuilder.rewrite(context);
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rewritten.subAggregations(rewrittenSubAggs);
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return rewritten;
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}
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/**
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* Rewrites this aggregation builder into its primitive form. By default
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* this method return the builder itself. If the builder did not change the
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* identity reference must be returned otherwise the builder will be
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* rewritten infinitely.
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*/
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protected AggregationBuilder doRewrite(QueryRewriteContext queryShardContext) throws IOException {
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return this;
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}
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/**
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* Rewrites the given aggregation into its primitive form. Aggregations that for instance fetch resources from remote hosts or
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* can simplify / optimize itself should do their heavy lifting during {@link #rewrite(QueryRewriteContext)}. This method
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* rewrites the aggregation until it doesn't change anymore.
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* @throws IOException if an {@link IOException} occurs
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*/
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static AggregationBuilder rewriteAggregation(AggregationBuilder original, QueryRewriteContext context) throws IOException {
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AggregationBuilder builder = original;
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for (AggregationBuilder rewrittenBuilder = builder.rewrite(context); rewrittenBuilder != builder;
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rewrittenBuilder = builder.rewrite(context)) {
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builder = rewrittenBuilder;
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}
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return builder;
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}
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/** Common xcontent fields shared among aggregator builders */
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public static final class CommonFields extends ParseField.CommonFields {
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public static final ParseField VALUE_TYPE = new ParseField("value_type");
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@ -25,6 +25,7 @@ import org.elasticsearch.common.io.stream.StreamOutput;
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import org.elasticsearch.common.io.stream.Writeable;
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import org.elasticsearch.common.xcontent.XContentBuilder;
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import org.elasticsearch.common.xcontent.XContentParser;
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import org.elasticsearch.index.query.QueryRewriteContext;
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import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
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import org.elasticsearch.search.aggregations.support.AggregationPath;
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import org.elasticsearch.search.aggregations.support.AggregationPath.PathElement;
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@ -457,5 +458,32 @@ public class AggregatorFactories {
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return false;
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return true;
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}
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/**
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* Rewrites the underlying aggregation builders into their primitive
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* form. If the builder did not change the identity reference must be
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* returned otherwise the builder will be rewritten infinitely.
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*/
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public Builder rewrite(QueryRewriteContext context) throws IOException {
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boolean changed = false;
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Builder newBuilder = new Builder();
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for (AggregationBuilder builder : aggregationBuilders) {
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AggregationBuilder result = AggregationBuilder.rewriteAggregation(builder, context);
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if (result != builder) {
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changed = true;
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}
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newBuilder.addAggregator(result);
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}
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if (changed) {
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for (PipelineAggregationBuilder builder : pipelineAggregatorBuilders) {
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newBuilder.addPipelineAggregator(builder);
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}
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return newBuilder;
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} else {
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return this;
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}
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}
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}
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}
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@ -24,7 +24,9 @@ import org.elasticsearch.common.io.stream.StreamOutput;
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import org.elasticsearch.common.xcontent.XContentBuilder;
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import org.elasticsearch.common.xcontent.XContentParser;
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import org.elasticsearch.index.query.QueryBuilder;
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import org.elasticsearch.index.query.QueryRewriteContext;
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import org.elasticsearch.search.aggregations.AbstractAggregationBuilder;
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import org.elasticsearch.search.aggregations.AggregationBuilder;
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import org.elasticsearch.search.aggregations.AggregatorFactories;
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import org.elasticsearch.search.aggregations.AggregatorFactory;
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import org.elasticsearch.search.internal.SearchContext;
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@ -68,12 +70,19 @@ public class FilterAggregationBuilder extends AbstractAggregationBuilder<FilterA
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out.writeNamedWriteable(filter);
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}
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@Override
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protected AggregationBuilder doRewrite(QueryRewriteContext queryShardContext) throws IOException {
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QueryBuilder result = QueryBuilder.rewriteQuery(filter, queryShardContext);
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if (result != filter) {
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return new FilterAggregationBuilder(getName(), result);
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}
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return this;
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}
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@Override
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protected AggregatorFactory<?> doBuild(SearchContext context, AggregatorFactory<?> parent,
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AggregatorFactories.Builder subFactoriesBuilder) throws IOException {
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// TODO this sucks we need a rewrite phase for aggregations too
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final QueryBuilder rewrittenFilter = QueryBuilder.rewriteQuery(filter, context.getQueryShardContext());
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return new FilterAggregatorFactory(name, rewrittenFilter, context, parent, subFactoriesBuilder, metaData);
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return new FilterAggregatorFactory(name, filter, context, parent, subFactoriesBuilder, metaData);
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}
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@Override
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@ -26,7 +26,9 @@ import org.elasticsearch.common.io.stream.StreamOutput;
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import org.elasticsearch.common.xcontent.XContentBuilder;
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import org.elasticsearch.common.xcontent.XContentParser;
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import org.elasticsearch.index.query.QueryBuilder;
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import org.elasticsearch.index.query.QueryRewriteContext;
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import org.elasticsearch.search.aggregations.AbstractAggregationBuilder;
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import org.elasticsearch.search.aggregations.AggregationBuilder;
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import org.elasticsearch.search.aggregations.AggregatorFactories.Builder;
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import org.elasticsearch.search.aggregations.AggregatorFactory;
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import org.elasticsearch.search.aggregations.bucket.filters.FiltersAggregator.KeyedFilter;
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@ -167,15 +169,28 @@ public class FiltersAggregationBuilder extends AbstractAggregationBuilder<Filter
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return otherBucketKey;
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}
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@Override
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protected AggregationBuilder doRewrite(QueryRewriteContext queryShardContext) throws IOException {
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List<KeyedFilter> rewrittenFilters = new ArrayList<>(filters.size());
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boolean changed = false;
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for (KeyedFilter kf : filters) {
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QueryBuilder result = QueryBuilder.rewriteQuery(kf.filter(), queryShardContext);
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rewrittenFilters.add(new KeyedFilter(kf.key(), result));
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if (result != kf.filter()) {
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changed = true;
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}
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}
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if (changed) {
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return new FiltersAggregationBuilder(getName(), rewrittenFilters);
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} else {
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return this;
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}
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}
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@Override
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protected AggregatorFactory<?> doBuild(SearchContext context, AggregatorFactory<?> parent, Builder subFactoriesBuilder)
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throws IOException {
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List<KeyedFilter> rewrittenFilters = new ArrayList<>(filters.size());
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for(KeyedFilter kf : filters) {
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rewrittenFilters.add(new KeyedFilter(kf.key(), QueryBuilder.rewriteQuery(kf.filter(),
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context.getQueryShardContext())));
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}
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return new FiltersAggregatorFactory(name, rewrittenFilters, keyed, otherBucket, otherBucketKey, context, parent,
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return new FiltersAggregatorFactory(name, filters, keyed, otherBucket, otherBucketKey, context, parent,
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subFactoriesBuilder, metaData);
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}
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@ -899,7 +899,7 @@ public final class SearchSourceBuilder extends ToXContentToBytes implements Writ
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* infinitely.
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*/
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public SearchSourceBuilder rewrite(QueryShardContext context) throws IOException {
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assert (this.equals(shallowCopy(queryBuilder, postQueryBuilder, sliceBuilder)));
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assert (this.equals(shallowCopy(queryBuilder, postQueryBuilder, aggregations, sliceBuilder)));
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QueryBuilder queryBuilder = null;
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if (this.queryBuilder != null) {
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queryBuilder = this.queryBuilder.rewrite(context);
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@ -908,9 +908,14 @@ public final class SearchSourceBuilder extends ToXContentToBytes implements Writ
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if (this.postQueryBuilder != null) {
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postQueryBuilder = this.postQueryBuilder.rewrite(context);
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}
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boolean rewritten = queryBuilder != this.queryBuilder || postQueryBuilder != this.postQueryBuilder;
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AggregatorFactories.Builder aggregations = null;
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if (this.aggregations != null) {
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aggregations = this.aggregations.rewrite(context);
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}
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boolean rewritten = queryBuilder != this.queryBuilder || postQueryBuilder != this.postQueryBuilder
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|| aggregations != this.aggregations;
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if (rewritten) {
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return shallowCopy(queryBuilder, postQueryBuilder, sliceBuilder);
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return shallowCopy(queryBuilder, postQueryBuilder, aggregations, sliceBuilder);
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}
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return this;
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}
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@ -919,14 +924,15 @@ public final class SearchSourceBuilder extends ToXContentToBytes implements Writ
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* Create a shallow copy of this builder with a new slice configuration.
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*/
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public SearchSourceBuilder copyWithNewSlice(SliceBuilder slice) {
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return shallowCopy(queryBuilder, postQueryBuilder, slice);
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return shallowCopy(queryBuilder, postQueryBuilder, aggregations, slice);
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}
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/**
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* Create a shallow copy of this source replaced {@link #queryBuilder}, {@link #postQueryBuilder}, and {@link #sliceBuilder}. Used by
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* {@link #rewrite(QueryShardContext)} and {@link #copyWithNewSlice(SliceBuilder)}.
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*/
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private SearchSourceBuilder shallowCopy(QueryBuilder queryBuilder, QueryBuilder postQueryBuilder, SliceBuilder slice) {
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private SearchSourceBuilder shallowCopy(QueryBuilder queryBuilder, QueryBuilder postQueryBuilder,
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AggregatorFactories.Builder aggregations, SliceBuilder slice) {
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SearchSourceBuilder rewrittenBuilder = new SearchSourceBuilder();
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rewrittenBuilder.aggregations = aggregations;
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rewrittenBuilder.explain = explain;
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@ -23,7 +23,6 @@ import org.elasticsearch.action.admin.indices.alias.Alias;
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import org.elasticsearch.action.search.SearchResponse;
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import org.elasticsearch.action.search.SearchType;
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import org.elasticsearch.cluster.metadata.IndexMetaData;
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import org.elasticsearch.index.query.QueryBuilder;
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import org.elasticsearch.index.query.QueryBuilders;
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import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramInterval;
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import org.elasticsearch.search.aggregations.bucket.histogram.Histogram;
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@ -37,8 +36,8 @@ import org.joda.time.format.DateTimeFormat;
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import java.util.List;
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import static org.elasticsearch.search.aggregations.AggregationBuilders.dateHistogram;
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import static org.elasticsearch.search.aggregations.AggregationBuilders.filter;
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import static org.elasticsearch.search.aggregations.AggregationBuilders.dateRange;
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import static org.elasticsearch.search.aggregations.AggregationBuilders.filter;
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import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
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import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertSearchResponse;
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import static org.hamcrest.Matchers.equalTo;
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@ -411,18 +410,7 @@ public class IndicesRequestCacheIT extends ESIntegTestCase {
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assertThat(client().admin().indices().prepareStats("index").setRequestCache(true).get().getTotal().getRequestCache().getMissCount(),
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equalTo(0L));
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// If the request has an aggregation containing now we should not cache
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final SearchResponse r4 = client().prepareSearch("index").setSearchType(SearchType.QUERY_THEN_FETCH).setSize(0)
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.setRequestCache(true).setQuery(QueryBuilders.rangeQuery("s").gte("2016-03-20").lte("2016-03-26"))
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.addAggregation(filter("foo", QueryBuilders.rangeQuery("s").from("now-10y").to("now"))).get();
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assertSearchResponse(r4);
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assertThat(r4.getHits().getTotalHits(), equalTo(7L));
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assertThat(client().admin().indices().prepareStats("index").setRequestCache(true).get().getTotal().getRequestCache().getHitCount(),
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equalTo(0L));
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assertThat(client().admin().indices().prepareStats("index").setRequestCache(true).get().getTotal().getRequestCache().getMissCount(),
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equalTo(0L));
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// If the request has an aggregation containng now we should not cache
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// If the request has an non-filter aggregation containing now we should not cache
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final SearchResponse r5 = client().prepareSearch("index").setSearchType(SearchType.QUERY_THEN_FETCH).setSize(0)
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.setRequestCache(true).setQuery(QueryBuilders.rangeQuery("s").gte("2016-03-20").lte("2016-03-26"))
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.addAggregation(dateRange("foo").field("s").addRange("now-10y", "now")).get();
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@ -442,6 +430,17 @@ public class IndicesRequestCacheIT extends ESIntegTestCase {
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equalTo(0L));
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assertThat(client().admin().indices().prepareStats("index").setRequestCache(true).get().getTotal().getRequestCache().getMissCount(),
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equalTo(2L));
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// If the request has a filter aggregation containing now we should cache since it gets rewritten
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final SearchResponse r4 = client().prepareSearch("index").setSearchType(SearchType.QUERY_THEN_FETCH).setSize(0)
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.setRequestCache(true).setQuery(QueryBuilders.rangeQuery("s").gte("2016-03-20").lte("2016-03-26"))
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.addAggregation(filter("foo", QueryBuilders.rangeQuery("s").from("now-10y").to("now"))).get();
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assertSearchResponse(r4);
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assertThat(r4.getHits().getTotalHits(), equalTo(7L));
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assertThat(client().admin().indices().prepareStats("index").setRequestCache(true).get().getTotal().getRequestCache().getHitCount(),
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equalTo(0L));
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assertThat(client().admin().indices().prepareStats("index").setRequestCache(true).get().getTotal().getRequestCache().getMissCount(),
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equalTo(4L));
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}
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public void testCacheWithFilteredAlias() {
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@ -19,15 +19,25 @@
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package org.elasticsearch.search.aggregations;
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import org.elasticsearch.common.ParsingException;
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import org.elasticsearch.common.bytes.BytesReference;
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import org.elasticsearch.common.settings.Settings;
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import org.elasticsearch.common.xcontent.NamedXContentRegistry;
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import org.elasticsearch.common.xcontent.XContent;
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import org.elasticsearch.common.xcontent.XContentBuilder;
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import org.elasticsearch.common.xcontent.XContentFactory;
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import org.elasticsearch.common.xcontent.XContentParser;
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import org.elasticsearch.common.xcontent.XContentType;
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import org.elasticsearch.common.xcontent.json.JsonXContent;
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import org.elasticsearch.env.Environment;
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import org.elasticsearch.index.query.QueryBuilder;
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import org.elasticsearch.index.query.QueryRewriteContext;
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import org.elasticsearch.index.query.TermsQueryBuilder;
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import org.elasticsearch.index.query.WrapperQueryBuilder;
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import org.elasticsearch.script.Script;
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import org.elasticsearch.search.SearchModule;
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import org.elasticsearch.search.aggregations.bucket.filter.FilterAggregationBuilder;
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import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorBuilders;
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import org.elasticsearch.search.aggregations.pipeline.bucketscript.BucketScriptPipelineAggregationBuilder;
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import org.elasticsearch.test.AbstractQueryTestCase;
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import org.elasticsearch.test.ESTestCase;
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@ -39,6 +49,7 @@ import java.util.regex.Pattern;
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import static java.util.Collections.emptyList;
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import static org.hamcrest.Matchers.containsString;
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import static org.hamcrest.Matchers.equalTo;
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import static org.hamcrest.Matchers.instanceOf;
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public class AggregatorFactoriesTests extends ESTestCase {
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private String[] currentTypes;
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@ -236,6 +247,44 @@ public class AggregatorFactoriesTests extends ESTestCase {
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assertThat(e.toString(), containsString("Expected [START_OBJECT] under [field], but got a [VALUE_STRING] in [tag_count]"));
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}
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public void testRewrite() throws Exception {
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XContentType xContentType = randomFrom(XContentType.values());
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BytesReference bytesReference;
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try (XContentBuilder builder = XContentFactory.contentBuilder(xContentType)) {
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builder.startObject();
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{
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builder.startObject("terms");
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{
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builder.array("title", "foo");
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}
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builder.endObject();
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}
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builder.endObject();
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bytesReference = builder.bytes();
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}
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FilterAggregationBuilder filterAggBuilder = new FilterAggregationBuilder("titles", new WrapperQueryBuilder(bytesReference));
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BucketScriptPipelineAggregationBuilder pipelineAgg = new BucketScriptPipelineAggregationBuilder("const", new Script("1"));
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AggregatorFactories.Builder builder = new AggregatorFactories.Builder().addAggregator(filterAggBuilder)
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.addPipelineAggregator(pipelineAgg);
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AggregatorFactories.Builder rewritten = builder
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.rewrite(new QueryRewriteContext(null, null, null, xContentRegistry, null, null, () -> 0L));
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assertNotSame(builder, rewritten);
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List<AggregationBuilder> aggregatorFactories = rewritten.getAggregatorFactories();
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assertEquals(1, aggregatorFactories.size());
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assertThat(aggregatorFactories.get(0), instanceOf(FilterAggregationBuilder.class));
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FilterAggregationBuilder rewrittenFilterAggBuilder = (FilterAggregationBuilder) aggregatorFactories.get(0);
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assertNotSame(filterAggBuilder, rewrittenFilterAggBuilder);
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assertNotEquals(filterAggBuilder, rewrittenFilterAggBuilder);
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// Check the filter was rewritten from a wrapper query to a terms query
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QueryBuilder rewrittenFilter = rewrittenFilterAggBuilder.getFilter();
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assertThat(rewrittenFilter, instanceOf(TermsQueryBuilder.class));
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// Check that a further rewrite returns the same aggregation factories builder
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AggregatorFactories.Builder secondRewritten = rewritten
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.rewrite(new QueryRewriteContext(null, null, null, xContentRegistry, null, null, () -> 0L));
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assertSame(rewritten, secondRewritten);
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}
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@Override
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protected NamedXContentRegistry xContentRegistry() {
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return xContentRegistry;
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@ -32,10 +32,11 @@ setup:
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indices.refresh: {}
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---
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"Filter aggs with terms lookup ensure not cached":
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"Filter aggs with terms lookup and ensure it's cached":
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# Because the filter agg rewrites the terms lookup in the rewrite phase the request can be cached
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- skip:
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version: " - 5.0.0"
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reason: This using filter aggs that needs rewriting, this was fixed in 5.0.1
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version: " - 5.99.99"
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reason: This using filter aggs that are rewritten, this was added in 6.0.0
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||||
- do:
|
||||
search:
|
||||
|
|
@ -53,7 +54,7 @@ setup:
|
|||
indices.stats: { index: test, metric: request_cache}
|
||||
- match: { _shards.total: 1 }
|
||||
- match: { _all.total.request_cache.hit_count: 0 }
|
||||
- match: { _all.total.request_cache.miss_count: 0 }
|
||||
- match: { _all.total.request_cache.miss_count: 1 }
|
||||
- is_true: indices.test
|
||||
|
||||
---
|
||||
|
|
|
|||
Loading…
Reference in New Issue