Yuming Wang created SPARK-28557:
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Summary: Support empty select list
Key: SPARK-28557
URL: https://issues.apache.org/jira/browse/SPARK-28557
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 3.0.0
Reporter: Yuming Wang
Examples:
{code:sql}
select union select;
select intersect select;
select except select;
{code}
https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/sql/union.sql#L193-L199
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