twalthr commented on a change in pull request #18524:
URL: https://github.com/apache/flink/pull/18524#discussion_r811070990
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File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/logical/utils/LogicalTypeCasts.java
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@@ -318,11 +318,17 @@ private static boolean supportsCasting(
// cast between interval and exact numeric is only supported if
interval has a single
// field
return isSingleFieldInterval(targetType);
+ } else if ((sourceType.is(CONSTRUCTED) ||
sourceType.is(STRUCTURED_TYPE))
+ && targetType.is(CHARACTER_STRING)) {
+ return supportsCollectionAndStructuredToStringCasting(sourceType,
allowExplicit);
Review comment:
if we would introduce new types, we need to check all utilities anyway.
it is pretty obvious that a `toString` will be supported by those as well. I
would suggest to keep the code simple.
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