DonnyZone 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_r347201882
##########
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:
@julianhyde
I noticed that AggVisitor treats grouping functions differently as other
aggregate functions (`!(operator instanceof SqlAbstractGroupFunction)`).
It is implemented in
[CALCITE-2135](https://issues.apache.org/jira/browse/CALCITE-2135).
By default, it ignores these grouping functions. Meanwhile, Calcite
validator also deals with the logic specifically in some places.
For example,
```
sql("select ^group_id()^ from emp")
```
throws `"GROUP_ID operator may only occur in an aggregate query"`
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