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groupBy: Short-circuit identity preCompute manipulators. (#3434)

This commit is contained in:
Gian Merlino 2016-09-06 21:28:44 -07:00 committed by Fangjin Yang
parent 1d07964987
commit 8d2ae144a8
1 changed files with 6 additions and 0 deletions
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6
processing/src/main/java/io/druid/query/groupby/GroupByQueryQueryToolChest.java
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@ -21,6 +21,7 @@ package io.druid.query.groupby;
import com.fasterxml.jackson.core.type.TypeReference;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import com.google.common.base.Predicate;
import com.google.common.base.Supplier;
import com.google.common.collect.Collections2;
@ -51,6 +52,7 @@ import io.druid.query.QueryToolChest;
import io.druid.query.SubqueryQueryRunner;
import io.druid.query.aggregation.AggregatorFactory;
import io.druid.query.aggregation.MetricManipulationFn;
import io.druid.query.aggregation.MetricManipulatorFns;
import io.druid.query.dimension.DefaultDimensionSpec;
import io.druid.query.dimension.DimensionSpec;
import io.druid.query.extraction.ExtractionFn;
@ -180,6 +182,10 @@ public class GroupByQueryQueryToolChest extends QueryToolChest<Row, GroupByQuery
final MetricManipulationFn fn
)
{
if (MetricManipulatorFns.identity().equals(fn)) {
return Functions.identity();
}
return new Function<Row, Row>()
{
@Override