[jira] [Created] (SPARK-19799) Support WITH clause in subqueries

["Giambattista (JIRA)" <ji...@apache.org>]

Giambattista created SPARK-19799:
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             Summary: Support WITH clause in subqueries
                 Key: SPARK-19799
                 URL: https://issues.apache.org/jira/browse/SPARK-19799
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Giambattista


Because of Spark-17590 it should be relatively easy to support WITH clause in subqueries besides nested CTE definitions.

Here an example of a query that does not run on spark:
create table test (seqno int, k string, v int) using parquet;
insert into TABLE test values (1,'a', 99),(2, 'b', 88),(3, 'a', 77),(4, 'b', 66),(5, 'c', 55),(6, 'a', 44),(7, 'b', 33);
SELECT percentile(b, 0.5) FROM (WITH mavg AS (SELECT k, AVG(v) OVER (PARTITION BY k ORDER BY seqno ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) as b FROM test ORDER BY seqno) SELECT k, MAX(b) as b  FROM mavg GROUP BY k);



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