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[SPARK-48655][SQL] SPJ: Add tests for shuffle skipping for aggregate …
…queries ### What changes were proposed in this pull request? Add unit test in KeyGroupedPartitionSuite to verify that aggregation can also skip shuffle if key matches partition key ### Why are the changes needed? This lacked test coverage ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Ran unit test ### Was this patch authored or co-authored using generative AI tooling? No Closes apache#47015 from szehon-ho/spj_test. Authored-by: Szehon Ho <szehon.apache@gmail.com> Signed-off-by: Chao Sun <chao@openai.com>
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