[jira] [Created] (HIVE-18416) Initial support for TABLE function

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

Jesus Camacho Rodriguez created HIVE-18416:
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             Summary: Initial support for TABLE function
                 Key: HIVE-18416
                 URL: https://issues.apache.org/jira/browse/HIVE-18416
             Project: Hive
          Issue Type: Bug
          Components: Parser
    Affects Versions: 3.0.0
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez


Include support for TABLE function derived table. In SQL standard, it is defined as:
{noformat}
<table function derived table> ::=
  TABLE <left paren> <collection value expression> <right paren>
{noformat}
Further, include limited support for its usage as LATERAL derived table.

This will allow Hive to execute queries such as:
{code}
SELECT tf.col1, tf.col2, tf.col3
FROM
  TABLE(VALUES('A', 10, 30.0),('B', 20, 30.0)) AS tf(col1, col2, col3);
SELECT tf.col1, tf.col2, tf.col3
FROM
  (SELECT key, value FROM src) t,
  LATERAL TABLE(VALUES('A', 10, t.key),('B', 20, t.key)) AS tf(col1, col2, col3);
{code}
The idea is to rely on AST rewriting for such cases, as TABLE can be implemented using {{inline}} UDTF with an {{array}} of {{structs}} representing the rows in the {{VALUES}} clause.




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