Yuming Wang created SPARK-27877:
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Summary: Implement SQL-standard LATERAL subqueries
Key: SPARK-27877
URL: https://issues.apache.org/jira/browse/SPARK-27877
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 3.0.0
Reporter: Yuming Wang
Subqueries appearing in {{FROM}} can be preceded by the key word {{LATERAL}}.
This allows them to reference columns provided by preceding {{FROM}} items. A
trivial example of {{LATERAL}} is:
{code:sql}
SELECT * FROM foo, LATERAL (SELECT * FROM bar WHERE bar.id = foo.bar_id) ss;
{code}
More details:
[https://www.postgresql.org/docs/9.3/queries-table-expressions.html#QUERIES-LATERAL]
[https://github.com/postgres/postgres/commit/5ebaaa49445eb1ba7b299bbea3a477d4e4c0430]
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