ngsg opened a new pull request, #4043:
URL: https://github.com/apache/hive/pull/4043
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### What changes were proposed in this pull request?
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ParallelEdgeFixer refers to RowSchema when inverting columns and updates
RuntimeValueInfo as well as SemiJoinBranchInfo.
### Why are the changes needed?
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Current ParallelEdgeFixer does not update RuntimeValueInfo while
SemiJoinBranchInfo is updated.
Since TezCompiler refers to RuntimeValueInfo when adding SemiJoin edges into
a Tez DAG, the inconsistency between RuntimeValueInfo and SemiJoinBranchInfo
leads to the absence of SemiJoin edge in Tez runtime.
Another problem of ParallelEdgeFixer is incorrect result of
colMappingInverseKeys().
In current implementation, colMappingInverseKeys() depends on
Operator.getColumnExprMap(), but I found that this method sometimes returns an
empty map although the Operator contains some columns. (Also the comment of
this method says that it returns only key columns for RS and GBY operators.)
When this happens, ParallelEdgeFixer inserts a SEL operator without any
column, and its child RS operator eventually fails due to Runtime error like
below message.
```
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException:
java.lang.RuntimeException: cannot find field _col0 from []
at
org.apache.hadoop.hive.ql.exec.ReduceSinkOperator.process(ReduceSinkOperator.java:384)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:888)
at
org.apache.hadoop.hive.ql.exec.SelectOperator.process(SelectOperator.java:94)
```
### Does this PR introduce _any_ user-facing change?
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No
### How was this patch tested?
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I tested the patch manually on cluster using the query described in JIRA and
TPC-DS queries.
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