luoyuxia commented on code in PR #21663: URL: https://github.com/apache/flink/pull/21663#discussion_r1098146682
########## flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/type/NumericOrDefaultReturnTypeInference.java: ########## @@ -56,11 +55,7 @@ public RelDataType inferReturnType(SqlOperatorBinding opBinding) { List<RelDataType> types = new ArrayList<>(); for (int i = startTypeIdx; i < nOperands; i++) { RelDataType type = opBinding.getOperandType(i); - if (SqlTypeUtil.isNumeric(type)) { - types.add(type); - } else { - return opBinding.getOperandType(defaultTypeIdx); - } + types.add(type); Review Comment: Do we really need to skip check for all type? In the fail case, if(b, 'xx', s), where the second operand is `char(2)`, the third operand is `string`, the it wll mistake the return type is `char(2)`, and then in the if code gen, it'll cast all operands to `char(2)`. Maybe we check `if (SqlTypeUtil.isNumeric(type) || SqlTypeUtil.isCharacter(type))` in here? WDYT? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org