sbroeder commented on code in PR #5271:
URL: https://github.com/apache/calcite/pull/5271#discussion_r4135768937
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core/src/main/java/org/apache/calcite/sql/validate/AliasNamespace.java:
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@@ -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.
Review Comment:
Rewrote the Javadoc along the lines you suggested, and fixed the underlying
bug: isUnnestOfStructArray now checks allowAliasUnnestItems() and returns false
under PRESTO/BIG_QUERY
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