hanyuzheng7 commented on code in PR #22922:
URL: https://github.com/apache/flink/pull/22922#discussion_r1251628168
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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:
Yes, we need it. In this situation[
](https://github.com/apache/flink/pull/22922/files/30098f6ed81b8be7b41e7bf75adfcd495a2c6acf#r1251632875)->
SELECT ARRAY_MIN(), although we set argumentCount to one, but
argumentDataTypes.size() == 0, if we do not check whether it is smaller than
one, it report out of boundary exception here
`final DataType argumentType = argumentDataTypes.get(0); `
But if the input arguments number is larger than one, argumentCount will
handle this situation.
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