sbroeder commented on code in PR #5271:
URL: https://github.com/apache/calcite/pull/5271#discussion_r4135781934
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core/src/main/java/org/apache/calcite/sql/validate/AliasNamespace.java:
##########
@@ -162,6 +163,25 @@ protected AliasNamespace(
}
}
+ /**
+ * Returns whether an UNNEST call's array operand has a struct element type.
+ *
+ * <p>{@link SqlUnnestOperator#inferReturnType} produces a 1-field row for
+ * both struct arrays and scalar arrays. Only the structs have a real field
+ * name worth preserving.
+ */
+ private boolean isUnnestOfStructArray(SqlCall unnestCall) {
+ if (unnestCall.operandCount() != 1) {
+ return false;
+ }
+ if (validator.config().conformance().allowAliasUnnestItems()) {
+ return false;
+ }
+ final RelDataType operandType =
validator.getValidatedNodeType(unnestCall.operand(0));
+ final RelDataType componentType = operandType.getComponentType();
+ return componentType != null && componentType.isStruct();
Review Comment:
Ack. Both addressed.
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