laurentgo opened a new pull request #1226: [CALCITE-2807] RelOptUtil#pushDownJoinConditions and INDF URL: https://github.com/apache/calcite/pull/1226 RelOptUtil#pushDownJoinConditions do not identify and preserve expanded versions of IS NOT DISTINCT FROM expressions, causing equi-joins to be miscategorized as inequality joins. Modify the function to try to collapse the expression back to an INDF expression if possible before visiting the expression and pushing it below the join.
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