Github user yjshen commented on the pull request: https://github.com/apache/flink/pull/1958#issuecomment-218278581 Hi @fhueske, part of the comments are resolved and updated, two TODOs: - [ ] Type coercion for expressions, for example: - `Add(int, long)` should be auto coerced to `Add(cast(long), long)` - expressions expecting `double` as input but get `int` such as `ln(int)` should be auto cast to `ln (cast(double))` - [ ] `TreeNode`, `FunctionCatalog` etc rewrite.
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