luoyuxia commented on code in PR #21927:
URL: https://github.com/apache/flink/pull/21927#discussion_r1106550718
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flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/type/NumericOrDefaultReturnTypeInference.java:
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@@ -56,7 +56,7 @@ 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)) {
+ if (SqlTypeUtil.isNumeric(type) || SqlTypeUtil.isCharacter(type)) {
Review Comment:
May be we need to update the class name and java doc for the class since it
won't be number or default return type any more.
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