twalthr commented on code in PR #19648:
URL: https://github.com/apache/flink/pull/19648#discussion_r867995052
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/functions/utils/SqlValidatorUtils.java:
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@@ -76,9 +80,25 @@ private static void adjustTypeForMultisetConstructor(
}
private static SqlNode castTo(SqlNode node, RelDataType type) {
- return SqlStdOperatorTable.CAST.createCall(
- SqlParserPos.ZERO,
- node,
-
SqlTypeUtil.convertTypeToSpec(type).withNullable(type.isNullable()));
+ final SqlDataTypeSpec dataTypeSpec;
+ if (SqlTypeUtil.isMap(type)) {
Review Comment:
Isn't this only fixing the top-level problem but not nested problems such as
`ARRAY[ARRAY[MAP]]` or even more complex `ARRAY[MAP[ARRAY[MAP]]]`?
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