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7a34ba35f7
The SimplifyConditional rule is removing NULL literals from those functions to simplify their evaluation. This happens in the Optimizer and a new instance of the conditional function is generated. Previously, the dataType was not set properly (defaulted to DataType.NULL) for those new instances and since the resolveType() wasn't called again it resulted in returning always null. E.g.: SELECT COALESCE(null, 'foo', null, 'bar') COALESCE(null, 'foo', null, 'bar') ----------------- null This issue was not visible before because the tests always used an alias for the conditional function which caused the resolveType() to be called which sets the dataType properly. E.g.: SELECT COALESCE(null, 'foo', null, 'bar') as c c ----------------- foo (cherry picked from commit c39980a65dd593363f1d8d1b038b26cb0ce02aaf)