Matthew Jacobs 3939591aa8
IMPALA-5623: Fix lag() on STRING cols to release UDF mem ...
IMPALA-4120 fixed an issue where lead/lag was potentially
operating on memory that the UDA didn't own, resulting in
potentially wrong results. As part of that fix, lead and lag
started allocating 'global' UDF memory (e.g. via Allocate()
rather than AllocateLocal()) in Init() which needs to be freed
in Serialize() or Finalize(), but only lead() was updated to
free the memory. This memory is eventually freed when the
fragment is torn down, but as a result of not freeing the
memory in Serialize or Finalize, the memory may be allocated
longer than necessary.
Change-Id: Id2b69b4ccb9cac076abca19bed6f0b1dd11dfff3
Reviewed-on: http://gerrit.cloudera.org:8080/7371
Reviewed-by: Matthew Jacobs <mj@cloudera.com >
Reviewed-by: Dan Hecht <dhecht@cloudera.com >
Tested-by: Impala Public Jenkins
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3939591aa8