[
https://issues.apache.org/jira/browse/CALCITE-4074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17140315#comment-17140315
]
Danny Chen commented on CALCITE-4074:
-------------------------------------
It seems the join condition you want is "is not distinct from "
> Wrong plan for IS NULL in join query
> ------------------------------------
>
> Key: CALCITE-4074
> URL: https://issues.apache.org/jira/browse/CALCITE-4074
> Project: Calcite
> Issue Type: Bug
> Reporter: Zhixiong Chen
> Priority: Major
>
> sql:
> {code:java}
> SELECT count(*), T1.NUM
> FROM
> (
> SELECT NUM FROM t6 GROUP BY NUM
> ) AS T1
> INNER JOIN
> (
> SELECT NUM FROM t5 GROUP BY NUM
> ) AS T2
> ON T1.NUM = T2.NUM
> OR ((T1.NUM IS NULL) AND (T2.NUM IS NULL))
> GROUP BY T1.NUM;{code}
> However the plan is
> {code:java}
> ProjectRel(EXPR$0=[$1], NUM=[$0], ctx=[])
> AggregateRel(group-set=[[0]], groups=[null], EXPR$0=[COUNT()], ctx=[])
> ProjectRel(NUM=[$0], ctx=[])
> JoinRel(condition=[=($0, $1)], joinType=[inner], ctx=[])
> AggregateRel(group-set=[[0]], groups=[null], ctx=[0@null])
> ProjectRel(NUM=[$1], ctx=[0@null])
> TableScan(table=[[DEFAULT, T6]], ctx=[0@null], fields=[[0, 1, 2]])
> AggregateRel(group-set=[[0]], groups=[null], ctx=[1@null])
> ProjectRel(NUM=[$1], ctx=[1@null])
> TableScan(table=[[DEFAULT, T5]], ctx=[1@null], fields=[[0, 1, 2]])
> {code}
> It seem the filter IS NULL is optimized , and the plan is wrong.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
