Re: [PR] [CALCITE-7010] The well-known count bug [calcite]

["suibianwanwank (via GitHub)" <gi...@apache.org>]

suibianwanwank commented on code in PR #4375:
URL: https://github.com/apache/calcite/pull/4375#discussion_r2126726488


##########
core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java:
##########
@@ -759,6 +758,68 @@ protected RexNode removeCorrelationExpr(
     }
 
     RelNode newRel = relBuilder.build();
+    // Special case where the group by is static (i.e., a select clause with aggregation functions

Review Comment:
   Actually, this isn't exactly the same:
   ```
   select sum(i0) from  (select i0 from test where i1 = 1) a
   
   sum |
   ----+
   null|
   (1 rows)
   ```
   
   ```
   select sum(i0) from  (select i0 from test where i1 = 1) a group by true
   
   sum|
   ---+
   (0 rows)
   ```



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