Implement `reverse` performance optimization#4056

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selsong wants to merge 17 commits intoopensearch-project:mainfrom

selsong:reverse_pushdown

Commits on Sep 8, 2025

WIP: sort flip collation
Selina Song
committed
Sort collation implemented, added ExplainIT
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spotless
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Add sort double reverse no op test
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update logical plan tests
Selina Song
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add opt rule for sort flip
Selina Song
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restore planutils after merge
Selina Song
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fix conflict with aggregate opt rule
Selina Song
committed

Commits on Sep 9, 2025

add no pushdown IT
Selina Song
committed
spotless format
Selina Song
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Address code review: extend hasSameField to compare all fields and simplify null direction handling
Selina Song
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add UT sparkSQL
Selina Song
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Commits on Sep 10, 2025

rename opt rule, cleanup explain UT
Selina Song
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Commits on Sep 11, 2025

remove Opt Rule, keep collation
Selina Song
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Merge branch 'main' into reverse_pushdown
selsong
authored

Commits on Sep 12, 2025

Add full reverse fallback log plan
Selina Song
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fix ExplainIT
Selina Song
committed