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Commit208d3a7

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Correct/improve the datetime_precision field in the information schema.
In particular, always show 0 for the date type instead of null, and show6 (the default) for time, timestamp, and interval without a declaredprecision. 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
1 parent5cca35a commit208d3a7

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2 files changed

+26
-17
lines changed

2 files changed

+26
-17
lines changed

‎doc/src/sgml/information_schema.sgml

Lines changed: 21 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/information_schema.sgml,v 1.38 2009/02/06 21:15:11 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/information_schema.sgml,v 1.39 2009/06/10 07:03:34 petere Exp $ -->
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33
<chapter id="information-schema">
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<title>The Information Schema</title>
@@ -395,9 +395,12 @@
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<entry><literal>datetime_precision</literal></entry>
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<entry><type>cardinal_number</type></entry>
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<entry>
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If <literal>data_type</literal> identifies a date, time, or
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interval type, the declared precision; null for all other data
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types or if no precision was declared.
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If <literal>data_type</literal> identifies a date, time,
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timestamp, or interval type, this column contains the (declared
400+
or implicit) fractional seconds precision of the type for this
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attribute, that is, the number of decimal digits maintained
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following the decimal point in the seconds value. For all
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other data types, this column is null.
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</entry>
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</row>
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@@ -995,9 +998,12 @@
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<entry><literal>datetime_precision</literal></entry>
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<entry><type>cardinal_number</type></entry>
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<entry>
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If <literal>data_type</literal> identifies a date, time, or
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interval type, the declared precision; null for all other data
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types or if no precision was declared.
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If <literal>data_type</literal> identifies a date, time,
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timestamp, or interval type, this column contains the (declared
1003+
or implicit) fractional seconds precision of the type for this
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column, that is, the number of decimal digits maintained
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following the decimal point in the seconds value. For all
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other data types, this column is null.
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</entry>
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</row>
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@@ -1729,7 +1735,7 @@
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<entry><type>cardinal_number</type></entry>
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<entry>
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If the domain has a numeric type, this column contains the
1732-
(declared or implicit) precision of the type for thiscolumn.
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(declared or implicit) precision of the type for thisdomain.
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The precision indicates the number of significant digits. It
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can be expressed in decimal (base 10) or binary (base 2) terms,
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as specified in the column
@@ -1755,7 +1761,7 @@
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<entry><type>cardinal_number</type></entry>
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<entry>
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If the domain has an exact numeric type, this column contains
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the (declared or implicit) scale of the type for thiscolumn.
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the (declared or implicit) scale of the type for thisdomain.
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The scale indicates the number of significant digits to the
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right of the decimal point. It can be expressed in decimal
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(base 10) or binary (base 2) terms, as specified in the column
@@ -1768,9 +1774,12 @@
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<entry><literal>datetime_precision</literal></entry>
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<entry><type>cardinal_number</type></entry>
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<entry>
1771-
If the domain has a date, time, or interval type, the declared
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precision; null for all other data types or if no precision was
1773-
declared.
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If <literal>data_type</literal> identifies a date, time,
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timestamp, or interval type, this column contains the (declared
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or implicit) fractional seconds precision of the type for this
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domain, that is, the number of decimal digits maintained
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following the decimal point in the seconds value. For all
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other data types, this column is null.
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</entry>
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</row>
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‎src/backend/catalog/information_schema.sql

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@
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*
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* Copyright (c) 2003-2009, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.53 2009/02/24 10:06:32 petere Exp $
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* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.54 2009/06/10 07:03:34 petere Exp $
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*/
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/*
@@ -160,12 +160,12 @@ CREATE FUNCTION _pg_datetime_precision(typid oid, typmod int4) RETURNS integer
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RETURNSNULLONNULL INPUT
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AS
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$$SELECT
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CASE WHEN $2=-1/*default typmod*/
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THENnull
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CASE WHEN $1IN (1082)/*date*/
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THEN0
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WHEN $1IN (1083,1114,1184,1266)/* time, timestamp, same + tz*/
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THEN$2
166+
THENCASE WHEN $2<0 THEN6 ELSE $2 END
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WHEN $1IN (1186)/* interval*/
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THEN $2 &65535
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THENCASE WHEN$2<0 THEN6 ELSE $2&65535 END
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ELSEnull
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END$$;
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