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Stamatis Zampetakis commented on CALCITE-3994:
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I agree with [~julianhyde]. I have the impression that this case is already
handled by {{RexExecutor}} which is normally passed in {{RexSimplify}}. If you
are using the {{ReduceExpressionsRule}} then maybe you did not set an executor
for the planner (check {{RelOptPlanner#setExecutor}}).
> RexSimplify reduce concat calls with constant arguments
> -------------------------------------------------------
>
> Key: CALCITE-3994
> URL: https://issues.apache.org/jira/browse/CALCITE-3994
> Project: Calcite
> Issue Type: Improvement
> Affects Versions: 1.21.0
> Reporter: Jess Balint
> Priority: Minor
>
> would be good to implement support for string concat in RexSimplify
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