Csaba Ringhofer created IMPALA-11340:
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Summary: Support BINARY in persistent legacy Java UDFs
Key: IMPALA-11340
URL: https://issues.apache.org/jira/browse/IMPALA-11340
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Reporter: Csaba Ringhofer
The BINARY implementation in https://gerrit.cloudera.org/#/c/16066/ supports
Java UDFs when the arguments and results are set explicitly, but does not
create functions with BINARY types when only the class is given and Impala is
supposed to create a function for all overloads of evaluate(),
The reason is backwards compatibility - before BINARY support Impala mapped
BytesWritable and BytesArray types to STRING, while Hive maps these types to
BINARY. To avoid breaking existing queries in Impala, we cannot create
functions with BINARY instead.
If BytesWritable/BytesArray is present as argument, we could create functions
with both signatures (on where all these types are mapped to STRING, one where
all are mapped to BINARY), but this would not work if these types are only
present as return type.
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