julianhyde commented on a change in pull request #1556: [CALCITE-3438]
Validator should disallow use of the GROUPING function inside a FILTER clause
URL: https://github.com/apache/calcite/pull/1556#discussion_r348778415
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File path: core/src/main/java/org/apache/calcite/sql/validate/AggVisitor.java
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@@ -44,6 +44,9 @@
* or group auxiliary functions (e.g. {@code TUMBLE_START}). */
protected final boolean group;
protected final SqlNameMatcher nameMatcher;
+ /** Whether to find grouping functions (i.e., {@code GROUP_ID},
+ * {@code GROUPING_ID}, {@code GROUPING}).*/
+ private boolean grouping = false;
Review comment:
The 2nd Actual is fine. But can you add a test
```
sql("select count(*) from emp order by ^group_id()^")
```
and that should give the error "GROUP_ID operator may only occur in SELECT,
HAVING or ORDER BY clause"
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