xuzifu666 commented on code in PR #4933:
URL: https://github.com/apache/calcite/pull/4933#discussion_r3440102489
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core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java:
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@@ -3261,8 +3069,10 @@ private void registerQuery(
if (orderList != null) {
// If the query is 'SELECT DISTINCT', restrict the columns
// available to the ORDER BY clause.
+ // DISTINCT ON is an exception: ORDER BY may reference columns
+ // not in the SELECT list.
final SqlValidatorScope selectScope3 =
- select.isDistinct()
+ (select.isDistinct() && !select.isDistinctOn())
Review Comment:
`SELECT DISTINCT DISTINCT ON(...) ` is also not support in PostgreSQL, we
can refer this link: https://onecompiler.com/postgresql/44sqp4qfd
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