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Posted to issues@spark.apache.org by "Yuming Wang (JIRA)" <ji...@apache.org> on 2019/05/30 08:27:00 UTC

[jira] [Created] (SPARK-27877) Implement SQL-standard LATERAL subqueries

Yuming Wang created SPARK-27877:
-----------------------------------

             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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