[ https://issues.apache.org/jira/browse/SPARK-43760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrey Gubichev updated SPARK-43760: ------------------------------------ Description: The following query: {code:java} select * from ( select t1.id c1, ( select t2.id c from range (1, 2) t2 where t1.id = t2.id ) c2 from range (1, 3) t1 ) t where t.c2 is not null -- !query schema struct<c1:bigint,c2:bigint> -- !query output 1 1 2 NULL {code} should return 1 row, because the second row is supposed to be removed by IsNotNull predicate. However, due to a wrong nullability propagation after subquery decorrelation, the output of the subquery is declared as not-nullable (incorrectly), so the predicate is constant folded into True. was: The following query: {{select *}} {{from range(1, 3) t1}} {{where (select sum(c) from (}} {{ select t2.id * t2.id c}} {{ from range (1, 2) t2 where t1.id = t2.id}} {{ group by t2.id}} {{ )}} {{) is not null;}} should return 1 row, because the second row is supposed to be removed by IsNotNull predicate. However, due to a wrong nullability propagation after subquery decorrelation, the output of the subquery is declared as not-nullable (incorrectly), so the predicate is constant folded into True. > Incorrect attribute nullability after RewriteCorrelatedScalarSubquery leads > to incorrect query results > ------------------------------------------------------------------------------------------------------ > > Key: SPARK-43760 > URL: https://issues.apache.org/jira/browse/SPARK-43760 > Project: Spark > Issue Type: Bug > Components: SQL > Affects Versions: 3.4.0 > Reporter: Andrey Gubichev > Priority: Major > > The following query: > > {code:java} > select * from ( > select t1.id c1, ( > select t2.id c from range (1, 2) t2 > where t1.id = t2.id ) c2 > from range (1, 3) t1 ) t > where t.c2 is not null > -- !query schema > struct<c1:bigint,c2:bigint> > -- !query output > 1 1 > 2 NULL > {code} > > should return 1 row, because the second row is supposed to be removed by > IsNotNull predicate. However, due to a wrong nullability propagation after > subquery decorrelation, the output of the subquery is declared as > not-nullable (incorrectly), so the predicate is constant folded into True. -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org