Code cleanup: ExecMapperContext.inputFileChanged() should only be called by
ExecMapper/MapOperator
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Key: HIVE-1949
URL: https://issues.apache.org/jira/browse/HIVE-1949
Project: Hive
Issue Type: Improvement
Reporter: Namit Jain
Currently, inputFileChanged() will only return true for the first row.
Consider the following scenario:
select /*+ mapjoin(B) */ ... from A join B where A.c1 < 100;
If the first row from A > 100, then the MapJoinOperator will never receive the
first row,
and if MapJoinOperator calls inputFileChanged() - that function will be called
for the
second row, and therefore return false.
It would be cleaner for ExecMapper/MapOperator to check whether input file
changed or not,
and then call some new function for each operator informing them that the input
file has
changed.
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