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Implement information schema interval_type columns

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Also correct reporting of interval precision when field restrictions
are specified in the typmod.
This commit is contained in:
Peter Eisentraut 2011-07-13 20:30:40 +03:00
parent 80a1d16935
commit 0527a454ec
2 changed files with 51 additions and 7 deletions
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30
doc/src/sgml/information_schema.sgml
View File

@ -483,7 +483,15 @@
<row>
<entry><literal>interval_type</literal></entry>
<entry><type>character_data</type></entry>
<entry>Not yet implemented</entry>
<entry>
If <literal>data_type</literal> identifies an interval type,
this column contains the specification which fields the
intervals include for this attribute, e.g., <literal>YEAR TO
MONTH</literal>, <literal>DAY TO SECOND</literal>, etc. If no
field restrictions were specified (that is, the interval
accepts all fields), and for all other data types, this field
is null.
</entry>
</row>
<row>
@ -1343,7 +1351,15 @@
<row>
<entry><literal>interval_type</literal></entry>
<entry><type>character_data</type></entry>
<entry>Not yet implemented</entry>
<entry>
If <literal>data_type</literal> identifies an interval type,
this column contains the specification which fields the
intervals include for this column, e.g., <literal>YEAR TO
MONTH</literal>, <literal>DAY TO SECOND</literal>, etc. If no
field restrictions were specified (that is, the interval
accepts all fields), and for all other data types, this field
is null.
</entry>
</row>
<row>
@ -2144,7 +2160,15 @@
<row>
<entry><literal>interval_type</literal></entry>
<entry><type>character_data</type></entry>
<entry>Not yet implemented</entry>
<entry>
If <literal>data_type</literal> identifies an interval type,
this column contains the specification which fields the
intervals include for this domain, e.g., <literal>YEAR TO
MONTH</literal>, <literal>DAY TO SECOND</literal>, etc. If no
field restrictions were specified (that is, the interval
accepts all fields), and for all other data types, this field
is null.
</entry>
</row>
<row>

28
src/backend/catalog/information_schema.sql
View File

@ -158,7 +158,18 @@ $$SELECT
WHEN $1 IN (1083, 1114, 1184, 1266) /* time, timestamp, same + tz */
THEN CASE WHEN $2 < 0 THEN 6 ELSE $2 END
WHEN $1 IN (1186) /* interval */
THEN CASE WHEN $2 < 0 THEN 6 ELSE $2 & 65535 END
THEN CASE WHEN $2 < 0 OR $2 & 65535 = 65535 THEN 6 ELSE $2 & 65535 END
ELSE null
END$$;
CREATE FUNCTION _pg_interval_type(typid oid, mod int4) RETURNS text
LANGUAGE sql
IMMUTABLE
RETURNS NULL ON NULL INPUT
AS
$$SELECT
CASE WHEN $1 IN (1186) /* interval */
THEN upper(substring(format_type($1, $2) from 'interval[()0-9]* #"%#"' for '#'))
ELSE null
END$$;
@ -321,7 +332,10 @@ CREATE VIEW attributes AS
AS cardinal_number)
AS datetime_precision,
CAST(null AS character_data) AS interval_type, -- FIXME
CAST(
_pg_interval_type(_pg_truetypid(a, t), _pg_truetypmod(a, t))
AS character_data)
AS interval_type,
CAST(null AS cardinal_number) AS interval_precision,
CAST(current_database() AS sql_identifier) AS attribute_udt_catalog,
@ -670,7 +684,10 @@ CREATE VIEW columns AS
AS cardinal_number)
AS datetime_precision,
CAST(null AS character_data) AS interval_type, -- FIXME
CAST(
_pg_interval_type(_pg_truetypid(a, t), _pg_truetypmod(a, t))
AS character_data)
AS interval_type,
CAST(null AS cardinal_number) AS interval_precision,
CAST(null AS sql_identifier) AS character_set_catalog,
@ -936,7 +953,10 @@ CREATE VIEW domains AS
AS cardinal_number)
AS datetime_precision,
CAST(null AS character_data) AS interval_type, -- FIXME
CAST(
_pg_interval_type(t.typbasetype, t.typtypmod)
AS character_data)
AS interval_type,
CAST(null AS cardinal_number) AS interval_precision,
CAST(t.typdefault AS character_data) AS domain_default,