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Posted to dev@trafodion.apache.org by Eric Owhadi <er...@esgyn.com> on 2016/03/29 23:20:26 UTC
is there a file or a documentation describing alignFormat
Hi Trafodioneers,
I am looking at 2 potentially low hanguing fruit optimization with
alignFormat:
- Provide some predicate pushdown support, when columns in
predicate are not nullable or not variable length or not added columns.
- See if we can implement a customFilter to silence nullable
columns, variable length column, or added column that are not needed by the
scan node using the transformCell() step in customFilters…
For these, I need to understand the internal coding of alignFormat…
Would appreciate a pointer on documentation or source file that would
enlighten me on this…
Thanks,
Eric
RE: is there a file or a documentation describing alignFormat
Posted by Anoop Sharma <an...@esgyn.com>.
look at sql/exp/ExpAlignedFormat.h for details.
anoop
-----Original Message-----
From: Eric Owhadi [mailto:eric.owhadi@esgyn.com]
Sent: Tuesday, March 29, 2016 2:20 PM
To: dev@trafodion.incubator.apache.org
Subject: is there a file or a documentation describing alignFormat
Hi Trafodioneers,
I am looking at 2 potentially low hanguing fruit optimization with
alignFormat:
- Provide some predicate pushdown support, when columns in
predicate are not nullable or not variable length or not added columns.
- See if we can implement a customFilter to silence nullable
columns, variable length column, or added column that are not needed by the
scan node using the transformCell() step in customFilters…
For these, I need to understand the internal coding of alignFormat…
Would appreciate a pointer on documentation or source file that would
enlighten me on this…
Thanks,
Eric