Chao created HIVE-8233:
--------------------------
Summary: multi-table insertion doesn't work with ForwardOperator
[Spark Branch]
Key: HIVE-8233
URL: https://issues.apache.org/jira/browse/HIVE-8233
Project: Hive
Issue Type: Bug
Components: Spark
Reporter: Chao
Right now, for multi-table insertion, we will start from multiple
FileSinkOperators, and break from their lowest common ancestor, adding
temporary FileSinkOperator and TableScanOperators. A special case is when the
LCA is a ForwardOperator, in which case we don't break it, since it's already
been optimized.
However, there's a issue, considering the following plan:
{{noformat}}
...
|
FOR
|
RS_0
/ \
RS_1 RS_2
| |
... ...
| |
FS_1 FS_2
{noformat}
In this case, {{FOR}} is the LCA, and the plan will still be a single one.
However, {{RS_0}} leads to both {{RS_1}} and {{RS_2}}. Because of the issue in
HIVE-7731 and HIVE-8118, both downstream branches will get duplicated (and
same) results.
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