Davies Liu created SPARK-13306:
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Summary: Uncorrelated scalar subquery
Key: SPARK-13306
URL: https://issues.apache.org/jira/browse/SPARK-13306
Project: Spark
Issue Type: New Feature
Reporter: Davies Liu
Assignee: Davies Liu
A scalar subquery is a subquery that only generate single row and single
column, could be used as part of expression.
Uncorrelated scalar subquery means it does not has a reference to external
table.
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