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Correct/improve the datetime_precision field in the information schema.

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In particular, always show 0 for the date type instead of null, and show
6 (the default) for time, timestamp, and interval without a declared
precision.  This is now in fuller conformance with the SQL standard.

Also clarify the documentation about this.

discovered and analyzed by Konstantin Izmailov and Tom Lane
This commit is contained in:
Peter Eisentraut
2009-06-10 07:03:34 +00:00
parent 5cca35a68b
commit 208d3a7555
2 changed files with 26 additions and 17 deletions
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10
src/backend/catalog/information_schema.sql
View File

@ -4,7 +4,7 @@
*
* Copyright (c) 2003-2009, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.53 2009/02/24 10:06:32 petere Exp $
* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.54 2009/06/10 07:03:34 petere Exp $
*/
/*
@ -160,12 +160,12 @@ CREATE FUNCTION _pg_datetime_precision(typid oid, typmod int4) RETURNS integer
RETURNS NULL ON NULL INPUT
AS
$$SELECT
CASE WHEN $2 = -1 /* default typmod */
THEN null
CASE WHEN $1 IN (1082) /* date */
THEN 0
WHEN $1 IN (1083, 1114, 1184, 1266) /* time, timestamp, same + tz */
THEN $2
THEN CASE WHEN $2 < 0 THEN 6 ELSE $2 END
WHEN $1 IN (1186) /* interval */
THEN $2 & 65535
THEN CASE WHEN $2 < 0 THEN 6 ELSE $2 & 65535 END
ELSE null
END$$;