danny0405 commented on issue #1862: [CALCITE-3864] Implement Concat function URL: https://github.com/apache/calcite/pull/1862#issuecomment-604882028 > In [CALCITE-3235](https://issues.apache.org/jira/browse/CALCITE-3235), `CONCAT` function with var args is added but not implemented (i.e., the query can only pass validation). > This PR focuses on: > (1) adding Oracle's `CONCAT` function, it accepts only two operands > (2) implementing `CONCAT` function in runtime > (3) fixing the return type inference issue > > Personally, I think "Implement CONCAT function" is ok. > @chunweilei @wenhuitang Do you have any suggestions to cover the topics above? "Supports CONCAT for variable arguments" seems fine to me.
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