Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3791#discussion_r114183388
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/datastream/DataStreamCorrelateRule.scala
---
@@ -59,10 +59,14 @@ class DataStreamCorrelateRule
case rel: RelSubset =>
convertToCorrelate(rel.getRelList.get(0), condition)
- case calc: FlinkLogicalCalc =>
+ case calc: FlinkLogicalCalc => {
--- End diff --
We have to add a check that the Calc only filters but does not modify the
input attributes (besides renaming fields). Otherwise, we might lose the
projection information (e.g., if one of the table functions attributes is
changed by an expression).
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