HIVE-28911: Improve SEARCH expansion to exploit <> operator#6503
Open
rubenada wants to merge 5 commits into
Open
HIVE-28911: Improve SEARCH expansion to exploit <> operator#6503rubenada wants to merge 5 commits into
rubenada wants to merge 5 commits into
Conversation
asf-ci-hive
added
tests pending
tests unstable
and removed
tests unstable
tests pending
labels
asf-ci-hive
added
tests pending
tests passed
and removed
tests unstable
tests pending
labels
…d of 'ref <> value1 AND ref <> value2' since the latter can break statistic propagation on partitioned tables (such as Iceberg). During Conjunctive Normal Form (CNF) expansion, nested inequalities inside 'OR' clauses flatten into structures that Hive's SearchArgument (Sarg) builder and Iceberg's partition-pruning layer cannot natively translate. This may cause the compiler to abandon filter pushdown at the TableScan phase, resetting column statistics from PARTIAL to NONE.
asf-ci-hive
added
tests pending
tests unstable
and removed
tests passed
tests pending
tests unstable
labels
|
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
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
What changes were proposed in this pull request?
Improve SEARCH expansion to exploit <> operator.
SEARCH operator can be used to represent many types of range predicates including the inequality operator (<>).
For example
d_dom <> 10can be represented asSEARCH($9, Sarg[(-∞..10), (10..+∞)]); or cases liked_dom <> 10 and d_dom <> 20can be represented asSEARCH($9, Sarg[(-∞..10), (10..20), (20..+∞)]).Currently, after SEARCH expansion the following expression will be generated:
OR(<($9, 10), >($9, 10))in the first case,OR(<($9, 10), >($9, 20), AND(>($9, 10), <($9, 20)))in the second case. With the proposed change we shall get the simpler<>($9, 10)in case of one value, orNOT (IN ($9, 10, 20))in case of multiple values.Why are the changes needed?
Exploit the inequality operator when expanding ranges to generate simpler and slightly more efficient expressions.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Unit test added. A few test plans adjusted reflecting this change.