cloud-fan opened a new pull request #24735: [SPARK-27871][SQL] LambdaVariable should use per-query unique IDs instead of globally unique IDs URL: https://github.com/apache/spark/pull/24735 ## What changes were proposed in this pull request? For simplicity, all `LambdaVariable`s are globally unique, to avoid any potential conflicts. However, this causes a perf problem: we can never hit codegen cache for encoder expressions that deal with collections (which means they contain `LambdaVariable`). To overcome this problem, `LambdaVariable` should have per-query unique IDs. This PR does 2 things: 1. refactor `LambdaVariable` to carry an ID, so that it's easier to change the ID. 2. add an optimizer rule to reassign `LambdaVariable` IDs, which are per-query unique. ## How was this patch tested? new tests
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