[jira] [Created] (HIVE-21230) HiveJoinAddNotNullRule bails out for outer joins

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

Jesus Camacho Rodriguez created HIVE-21230:
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             Summary: HiveJoinAddNotNullRule bails out for outer joins
                 Key: HIVE-21230
                 URL: https://issues.apache.org/jira/browse/HIVE-21230
             Project: Hive
          Issue Type: Improvement
          Components: CBO
            Reporter: Jesus Camacho Rodriguez


For instance, given the following query:

{code:sql}
SELECT t0.col0, t0.col1
FROM
  (
    SELECT col0, col1 FROM tab
  ) AS t0
  LEFT JOIN
  (
    SELECT col0, col1 FROM tab
  ) AS t1
ON t0.col0 = t1.col0 AND t0.col1 = t1.col1
{code}

we could still infer that col0 and col1 cannot be null in the right input and introduce the corresponding filter predicate. Currently, the rule just bails out if it is not an inner join.
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveJoinAddNotNullRule.java#L79



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