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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