UDFs should be made aware of their arguments are constants.
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Key: HIVE-2327
URL: https://issues.apache.org/jira/browse/HIVE-2327
Project: Hive
Issue Type: Improvement
Reporter: Adam Kramer
There are a lot of UDFs which would show major performance differences if one
assumes that some of its arguments are constant.
Consider, for example, any UDF that takes a regular expression as input: This
can be complied once (fast) if it's a constant, or once per row (wicked slow)
if it's not a constant.
Or, consider any UDF that reads from a file and/or takes a filename as input;
it would have to re-read the whole file if the filename changes.
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