HIVE-28911: Improve SEARCH expansion to exploit <> operator#6503
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rubenada wants to merge 3 commits into
Open
HIVE-28911: Improve SEARCH expansion to exploit <> operator#6503rubenada wants to merge 3 commits into
rubenada wants to merge 3 commits into
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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 <> 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, 20), AND(>($9, 10), <($9, 20))); with the proposed change we shall get the original (and simpler)AND(<>($9, 10), <>($9, 20)).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.