[jira] [Created] (IMPALA-10785) when union kudu table and hdfs table, union passthrough does not take effect

["pengdou1990 (Jira)" <ji...@apache.org>]

pengdou1990 created IMPALA-10785:
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             Summary: when union kudu table and hdfs table, union passthrough does not take effect
                 Key: IMPALA-10785
                 URL: https://issues.apache.org/jira/browse/IMPALA-10785
             Project: IMPALA
          Issue Type: Improvement
            Reporter: pengdou1990


[IMPALA-3586|https://issues.apache.org/jira/browse/IMPALA-3586] already supports union passthrough, and brings great performance improvements in union， but there is still some problems when union between hdfs table and kudu table ，several points cause the problem:
 # in kudu scanner node output TupleDescriptor, string slot is 16B,while in hdfs scanner node output TupleDescriptor, string slot is 12B,cause tuple memory layout mismatch

 # in kudu scanner node output TupleDescriptor, string slot is 16B, while in Union output TupleDescriptor, string slot is 12B,cause tuple memory layout mismatch

 # in Kudu Scannode, row key slot is not null, while in hdfs node, not null slot can't get from the metadata, cause tuple memory layout mismatch

I hive resolved the 1st and 2nd points, how should I do with the 3rd point?



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