mihaibudiu commented on code in PR #5052:
URL: https://github.com/apache/calcite/pull/5052#discussion_r3487110899
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core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java:
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@@ -5599,6 +5601,14 @@ protected RelDataType validateSelectList(final
SqlNodeList selectItems,
// First pass, ensure that aliases are unique. "*" and "TABLE.*" items
// are ignored.
+ // Rewrite scalar sub-queries whose single select item is an aggregate
+ // over outer columns. The aggregate belongs to the outer query per SQL
+ // standard, but only if the current conformance allows this non-standard
+ // correlated-aggregate construct.
+ if (config.conformance().isCorrelatedAggregateAllowed()) {
Review Comment:
where is an error reported if the conformance does not allow this?
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