UDFs should be made aware of their arguments are constants. -----------------------------------------------------------
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. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira