Performance: use `IsSingleShard()` check in `pushDerived` instead of just `engine.EqualUnique` opcode#18974

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ChaitanyaD48 wants to merge 6 commits intovitessio:mainfrom

ChaitanyaD48:perf/pushDerived-use-isSingleShard

Commits on Dec 2, 2025

update condition in pushDerived to check for single shard routing
ChaitanyaD48
committed

Commits on Dec 18, 2025

Merge branch 'main' of github.com:ChaitanyaD48/vitess into perf/pushDerived-use-isSingleShard
ChaitanyaD48
committed
test: add reference case for derived table pushdown optimization
ChaitanyaD48
committed

Commits on Jan 18, 2026

Merge branch 'main' of github.com:ChaitanyaD48/vitess into perf/pushDerived-use-isSingleShard
ChaitanyaD48
committed

Commits on Jan 19, 2026