wenhuitang commented on issue #1862: [CALCITE-3864] Add Implementation for SqlLibraryOperators.CONCAT_FUNCTION in SqlFunctions and correct the return type inference of SqlLibraryOperators.CONCAT_FUNCTION URL: https://github.com/apache/calcite/pull/1862#issuecomment-603669239 > (1)In Oracle, `concat` function accepts only two operands. In `SqlLibraryOperators`, We'd better seperate the `CONCAT_FUNCTION` into `CONCAT_FUNCTION` and `ORACLE_CONCAT_FUNCTION`. For `ORACLE_CONCAT_FUNCTION`, we can use `SqlOperandCountRanges.of(2)` to enable the constraint. How about seperate the `CONCAT_FUNCTION` into `CONCAT_FUNCTION` which uses SqlOperandCountRanges.from(3) and `CONCAT2` which uses `SqlOperandCountRanges.of(2)`? And the libraries for `CONCAT_FUNCTION` are PG and MySql. The libraries for `CONCAT2` are Oracle, PG and MySQL .Since currently `CONCAT_FUNCTION` which use SqlOperandCountRanges.from(2) contains the case of concat2 that may lead to confusion.
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