yanlin-Lynn opened a new pull request #1426: [CALCITE-3313] Override getAllowedSignatures function for SqlRegexpReplaceFunction. URL: https://github.com/apache/calcite/pull/1426 The `getAllowedSignatures` of class `SqlRegexpReplaceFunction` is not overrided, and `operandTypeChecker ` is null. So when using `REGEXP_REPLACE` incorrectly, we get an AssertionError as described in jira: [CALCITE-3306](https://issues.apache.org/jira/browse/CALCITE-3306). This PR tries to implements the getAllowedSignatures.
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