[HIVE-4771] Support subqueries in INSERT for array types

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Query Processor
• Assignee: Unassigned
• Reporter: Michael Malak
• Created: 20/Jun/13 22:08
• Updated: 20/Jun/13 22:08

Description

Since Hive supports SQL1999-style array types for columns, it would be nice for there to be a way to INSERT non-static data into such columns – i.e. from another table based on a complex query as opposed to loading from a static file, loading from hard-coded values within the INSERT query, or copying complete arrays verbatim from another table.

An example can be found at:
http://www.postgresql.org/message-id/[e-mail]

CREATE TABLE table_a(a int, b int, c int[]);

INSERT INTO table_a
SELECT a, b, ARRAY(SELECT c FROM table_c WHERE table_c.parent = table_b.id)
FROM table_b

This should be implemented after regular correlated and uncorrelated subqueries are implemented:

https://issues.apache.org/jira/browse/HIVE-784 "Support uncorrelated subqueries in the WHERE clause"

https://issues.apache.org/jira/browse/HIVE-1799 "Support correlated subqueries in the WHERE clause"