[8.19] Avoid O(N^2) in VALUES with ordinals grouping (#130576) #130775
+682
−317
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Using the VALUES aggregator with ordinals grouping led to accidental quadratic complexity. Queries like FROM .. | STATS ... VALUES(field) ... BY keyword-field are affected by this performance issue. This change caches a sorted structure - previously used to fix a similar O(N^2) problem when emitting the output block - during the merging phase of the OrdinalGroupingOperator. # Conflicts: # x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/ValuesBytesRefAggregator.java # x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/ValuesDoubleAggregator.java # x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/ValuesFloatAggregator.java # x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/ValuesIntAggregator.java # x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/ValuesLongAggregator.java # x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/aggregation/ValuesBytesRefAggregators.java # x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/aggregation/X-ValuesAggregator.java.st
dnhatn
force-pushed
the
backport/8.19/pr-130576
branch
from
805c831 to
cd7d762
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Backport
This will backport the following commits from
mainto8.19:Questions ?
Please refer to the Backport tool documentation