dawidwys commented on code in PR #22730:
URL: https://github.com/apache/flink/pull/22730#discussion_r1226894432
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinitions.java:
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@@ -272,6 +281,61 @@ ANY, and(logical(LogicalTypeRoot.BOOLEAN), LITERAL)
"org.apache.flink.table.runtime.functions.scalar.ArrayUnionFunction")
.build();
+ public static final BuiltInFunctionDefinition ARRAY_MAX =
+ BuiltInFunctionDefinition.newBuilder()
+ .name("ARRAY_MAX")
+ .kind(SCALAR)
+ .inputTypeStrategy(
+ new InputTypeStrategy() {
Review Comment:
Yes, we should have that in a separate class.
BTW, I don't think the current implementation checks comparability in the
right way. You can take a look (and probably reuse a lot of) at
https://github.com/confluentinc/flink/blob/ff7a0f6f25748933729bc94038444b3d4e233315/flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/ComparableTypeStrategy.java#L59
I'd try to extract as much of the logic from there and reuse it.
In the end I believe we should strive to have something similar to:
https://github.com/confluentinc/flink/blob/ff7a0f6f25748933729bc94038444b3d4e233315/flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/ConstraintArgumentTypeStrategy.java#L35
where the constraint is applied to array's argument.
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