-
Type:
Bug
-
Status: Closed
-
Priority:
Major
-
Resolution: Fixed
-
Affects Version/s: None
-
Fix Version/s: 0.9.0-incubating
-
Component/s: None
-
Labels:None
Semi-join is an important logical relational expression but many query sources (e.g. SqlToRelTranslator) do not generate them. This rule would create SemiJoinRel if it sees a join that aggregates its right input on the join key; a project on top is necessary to be sure that columns from the right side of the join are not being used.
Also, add class JoinInfo and a method on JoinRelBase 'public JoinInfo analyzeCondition()', to make it easier to analyze whether join conditions are equi-joins.
- relates to
-
CALCITE-328 Introduce semi-join-like flag in JoinRelBase
-
- Open
-