Andrey Gubichev created SPARK-49653:
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Summary: Support single joins for full scalar subquery
decorrelation
Key: SPARK-49653
URL: https://issues.apache.org/jira/browse/SPARK-49653
Project: Spark
Issue Type: New Feature
Components: SQL
Affects Versions: 4.0.0
Reporter: Andrey Gubichev
We should introduce Single join operator to fully support scalar subqueries.
The operator would ensure that the scalar subquery returns at most 1 row and
issue a runtime error otherwise.
Design doc:
https://docs.google.com/document/d/1NTsvtBTB9XvvyRvH62QzWIZuw4hXktALUG1fBP7ha1Q/edit
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