Brock Noland created HIVE-6913:
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Summary: Hive unable to find the hashtable file during complex
multi-staged map join
Key: HIVE-6913
URL: https://issues.apache.org/jira/browse/HIVE-6913
Project: Hive
Issue Type: Bug
Reporter: Brock Noland
If a query has multiple mapjoins and one of the tables to be mapjoined is
empty, the query can result in a "no such file or directory" when looking for
the hashtable.
This is because when we generate a dummy hash table, we do not close the
TableScan (TS) operator for that table. Additionally, HashTableSinkOperator
(HTSO) outputs it's hash tables in the closeOp method. However, when close is
called on HTSO we check to ensure that all parents are closed:
https://github.com/apache/hive/blob/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java#L333
which is not true on this case, because the TS operator for the empty table was
never closed.
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