Julian Hyde created OPTIQ-393:
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Summary: If no fields are projected from a table, field trimmer
should project a dummy expression
Key: OPTIQ-393
URL: https://issues.apache.org/jira/browse/OPTIQ-393
Project: Optiq
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
If no fields are projected from a table, field trimmer should project a dummy
expression. Projecting no expressions is wrong, because it confuses other parts
of the system; projecting all fields is wrong, because we would get data volume
stats wrong and lose the opportunity to read less data from disk.
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