Gabor Kaszab created IMPALA-9554:
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Summary: Expose complex type interface through UDFs
Key: IMPALA-9554
URL: https://issues.apache.org/jira/browse/IMPALA-9554
Project: IMPALA
Issue Type: New Feature
Components: Backend, Frontend
Reporter: Gabor Kaszab
Once there is a better understanding of how complex types could be added to
builtin functions then we can expose the complex type support through UDFs by
allowing complex types as parameters or as return values.
The reason this should come as a second step is that once we have exposed these
UDF changes we have to keep backward compatibility in the following releases so
there won’t be much room to adjust.
What brings some complexity is that CollectionVal uses Impala’s internal tuple
representation and it is not trivial to expose through UDFs. There might be 2
ways:
# Expose helper functions to extract tuples, fields, etc.
# For UDFs use a different representation than tuples and translate them to
the internal representation when a UDF is called.
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