slinkydeveloper commented on a change in pull request #17256:
URL: https://github.com/apache/flink/pull/17256#discussion_r708344224
##########
File path:
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/calcite/FlinkPlannerImpl.scala
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@@ -97,6 +97,7 @@ class FlinkPlannerImpl(
typeFactory,
SqlValidator.Config.DEFAULT
.withIdentifierExpansion(true)
+ .withCallRewrite(false) // Disables the rewrite of COALESCE
Review comment:
This creates another issue though, it disables constant folding:
```
optimized rel plan expected:<
LogicalProject([$f0=[CAST(10):INTEGER]], empno=[$0], ename...> but was:<
LogicalProject([deptno=[COALESCE(10, $8)]], empno=[$0], ename...>
```
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