clintropolis commented on a change in pull request #11115:
URL: https://github.com/apache/druid/pull/11115#discussion_r615150932



##########
File path: 
extensions-core/datasketches/src/test/java/org/apache/druid/query/aggregation/datasketches/hll/sql/HllSketchSqlAggregatorTest.java
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@@ -207,6 +234,9 @@ public void tearDown() throws Exception
   @Test
   public void testApproxCountDistinctHllSketch() throws Exception
   {
+    // Can't vectorize due to CONCAT expression.

Review comment:
       super nit: but this is actually due to `SUBSTRING` i think




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