fix nullif deduce type
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		| @ -7475,7 +7475,7 @@ select collation(nullif('a', binary'b')); | ||||
| +-----------------------------------+ | ||||
| | collation(nullif('a', binary'b')) | | ||||
| +-----------------------------------+ | ||||
| | binary                            | | ||||
| | utf8mb4_general_ci                | | ||||
| +-----------------------------------+ | ||||
| select NULLIF(14152561829011783680, 1); | ||||
| +---------------------------------+ | ||||
| @ -7661,7 +7661,7 @@ select collation(nullif('a', binary 'b')); | ||||
| +------------------------------------+ | ||||
| | collation(nullif('a', binary 'b')) | | ||||
| +------------------------------------+ | ||||
| | binary                             | | ||||
| | utf8mb4_general_ci                 | | ||||
| +------------------------------------+ | ||||
|  | ||||
| ## test nullif with enumset parameter. | ||||
|  | ||||
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