hanyuzheng7 commented on code in PR #22922:
URL: https://github.com/apache/flink/pull/22922#discussion_r1252435731
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flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/ArrayComparableElementTypeStrategy.java:
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@@ -67,6 +67,9 @@ public ArgumentCount getArgumentCount() {
public Optional<List<DataType>> inferInputTypes(
CallContext callContext, boolean throwOnFailure) {
final List<DataType> argumentDataTypes =
callContext.getArgumentDataTypes();
+ if (argumentDataTypes.size() < 1) {
+ return Optional.empty();
+ }
Review Comment:
I think we can use
` if (argumentDataTypes.size() < 1) {
return Optional.empty();
}`
to handle empty input situation temporary, because Calcite's stack
inference logic and the argument count check can work except empty argument
input. Once the bug in the Calcite's stack inference logic and the argument
count check solved, we can remove this if statement.
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