gianm commented on a change in pull request #8775: Fix NPE for subquery with
limit
URL: https://github.com/apache/incubator-druid/pull/8775#discussion_r341681386
##########
File path: sql/src/test/java/org/apache/druid/sql/calcite/CalciteQueryTest.java
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@@ -7344,6 +7344,36 @@ public void testUsingSubqueryWithExtractionFns() throws
Exception
);
}
+ @Test
+ public void testUsingSubqueryWithLimit() throws Exception
+ {
+ testQuery(
+ "SELECT COUNT(*) AS cnt FROM ( SELECT * FROM druid.foo LIMIT 10 )
tmpA",
Review comment:
Whoa, this looks wrong. The query doesn't have a native query and it returns
an empty result set.
I think that probably, this query should return an error, because it
represents a kind of query structure Druid can't do right now (aggregation on
top of a non-aggregating subquery).
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