Allow NULLS LAST in CREATE INDEX
--------------------------------
Key: CORE-5914
URL: http://tracker.firebirdsql.org/browse/CORE-5914
Project: Firebird Core
Issue Type: Improvement
Components: Engine
Reporter: Karol Bieniaszewski
Add posiibility to specify NULLS LAST/NULLS FIRS directive in index creation
CREATE ASCENDING INDEX IXA_TABLE_FIELD ON TABLE(FIELD) NULLS LAST;
this will help in queries like this
SELECT
*
FROM
TABLE
ORDER BY FIELD NULLS LAST
or
SELECT
*
FROM
TABLE
WHERE
FIELD IS NOT NULL
ORDER BY FIELD
now plan looks like
PLAN (TABLE ORDER IXA_TABLE_FIELD)
which is not efficient because first in index are nulls
But if table have most of nulls but for e.g. 1% contain data, this plan is
inefficient
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://tracker.firebirdsql.org/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
Firebird-Devel mailing list, web interface at
https://lists.sourceforge.net/lists/listinfo/firebird-devel
