Disallow OUTER JOIN with partition in WHERE clause in strict mode
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Key: HIVE-832
URL: https://issues.apache.org/jira/browse/HIVE-832
Project: Hadoop Hive
Issue Type: Wish
Reporter: Adam Kramer
There is a wide-range poorly-understood issue in how WHERE and ON clauses work
in the case of outer joins.
The WHERE filter is applied after the join. After an outer join, the INNER
table (the left table in a RIGHT OUTER, or the left table in the LEFT OUTER)
has all columns set to NULL for all rows. As a result, if ANY of them are cited
in the WHERE clause, they will equal NULL. This almost always causes the join
to effectively be an INNER join, even though the user typed the word O-U-T-E-R,
probably for good reason.
In strict mode, we should not allow ANY COLUMNS from the inner table to appear
in the WHERE clause.
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