yanlin-Lynn commented on issue #1426: [CALCITE-3313] Describe the end-user functionality of REGEXP_REPLACE URL: https://github.com/apache/calcite/pull/1426#issuecomment-526805759 > LGTM~ But I cannot see If `regexp_replace` supports `Char` type in `Mysql`? In the document on [calcite site](https://calcite.apache.org/docs/reference.html). `CHAR(n)` stands for `Fixed-width character string`. And I add a test case for `CHAR(n)`, it works well. So, I think it's OK to add `CHAR` type in the allowed signature string.
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