yeshengm opened a new pull request #25080: [SPARK-28306] Fix idempotence for optimizer rule NormalizeFloatingNumbers URL: https://github.com/apache/spark/pull/25080 ## What changes were proposed in this pull request? The optimizer rule `NormalizeFloatingNumbers` is not idempotent. It will generate multiple `NormalizeNaNAndZero` and `ArrayTransform` expression nodes for multiple runs. This patch fixed this non-idempotence by adding a marking tag above normalized expressions. It also adds missing UTs for `NormalizeFloatingNumbers`. ## How was this patch tested? New UTs.
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