xiong duan created CALCITE-6836:
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Summary: Add Rule to convert INTERSECT to EXISTS
Key: CALCITE-6836
URL: https://issues.apache.org/jira/browse/CALCITE-6836
Project: Calcite
Issue Type: Bug
Reporter: xiong duan
The INTERSECT SQL:
{code:java}
SELECT a.CustID FROM tbl1 AS a
INTERSECT
SELECT b.CustID FROM tbl2 AS b {code}
The converted Exists SQL:
{code:java}
SELECT DISTINCT a.CustID FROM tbl1 AS a
WHERE EXISTS (SELECT b.CustID FROM tbl2 b WHERE (a.CustID=b.CustID)) {code}
This optimized method is also described in the paper(The eighth rule in Chapter
Three) [Extensible/rule based query rewrite optimization in
Starburst|https://15799.courses.cs.cmu.edu/spring2025/papers/03-starburst/pirahesh-sigmodrec1992.pdf].
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