Fix information schema views to return NULL for precision and scale of
an unconstrained numeric column. Also, factor out some duplicate code into functions, to ease future maintenance.
This commit is contained in:
Tom Lane
parent
5ca40c5d31
commit
1a76550b3b
@ -4,7 +4,7 @@
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*
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* Copyright 2003, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.23 2004/02/03 08:29:56 joe Exp $
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* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.24 2004/06/22 22:30:32 tgl Exp $
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*/
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/*
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@ -26,6 +26,133 @@ CREATE SCHEMA information_schema;
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GRANT USAGE ON SCHEMA information_schema TO PUBLIC;
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SET search_path TO information_schema, public;
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/*
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* A few supporting functions first ...
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*/
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/* This returns the integers from 1 to INDEX_MAX_KEYS/FUNC_MAX_ARGS */
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CREATE FUNCTION _pg_keypositions() RETURNS SETOF integer
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LANGUAGE sql
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IMMUTABLE
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AS 'select g.s
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from generate_series(1,current_setting(''max_index_keys'')::int,1)
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as g(s)';
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CREATE FUNCTION _pg_keyissubset(smallint[], smallint[]) RETURNS boolean
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS 'select $1[1] is null or ($1[1] = any ($2) and coalesce(information_schema._pg_keyissubset($1[2:pg_catalog.array_upper($1,1)], $2), true))';
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CREATE FUNCTION _pg_keysequal(smallint[], smallint[]) RETURNS boolean
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS 'select information_schema._pg_keyissubset($1, $2) and information_schema._pg_keyissubset($2, $1)';
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CREATE FUNCTION _pg_truetypid(pg_attribute, pg_type) RETURNS oid
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS
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$$SELECT CASE WHEN $2.typtype = 'd' THEN $2.typbasetype ELSE $1.atttypid END$$;
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CREATE FUNCTION _pg_truetypmod(pg_attribute, pg_type) RETURNS int4
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS
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$$SELECT CASE WHEN $2.typtype = 'd' THEN $2.typtypmod ELSE $1.atttypmod END$$;
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-- these functions encapsulate knowledge about the encoding of typmod:
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CREATE FUNCTION _pg_char_max_length(typid oid, typmod int4) RETURNS integer
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS
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$$SELECT
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CASE WHEN $2 = -1 /* default typmod */
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THEN null
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WHEN $1 IN (1042, 1043) /* char, varchar */
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THEN $2 - 4
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WHEN $1 IN (1560, 1562) /* bit, varbit */
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THEN $2
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ELSE null
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END$$;
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CREATE FUNCTION _pg_char_octet_length(typid oid, typmod int4) RETURNS integer
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS
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$$SELECT
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CASE WHEN $1 IN (25, 1042, 1043) /* text, char, varchar */
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THEN CAST(2^30 AS integer)
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ELSE null
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END$$;
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CREATE FUNCTION _pg_numeric_precision(typid oid, typmod int4) RETURNS integer
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS
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$$SELECT
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CASE $1
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WHEN 21 /*int2*/ THEN 16
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WHEN 23 /*int4*/ THEN 32
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WHEN 20 /*int8*/ THEN 64
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WHEN 1700 /*numeric*/ THEN
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CASE WHEN $2 = -1
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THEN null
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ELSE (($2 - 4) >> 16) & 65535
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END
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WHEN 700 /*float4*/ THEN 24 /*FLT_MANT_DIG*/
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WHEN 701 /*float8*/ THEN 53 /*DBL_MANT_DIG*/
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ELSE null
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END$$;
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CREATE FUNCTION _pg_numeric_precision_radix(typid oid, typmod int4) RETURNS integer
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS
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$$SELECT
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CASE WHEN $1 IN (21, 23, 20, 700, 701) THEN 2
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WHEN $1 IN (1700) THEN 10
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ELSE null
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END$$;
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CREATE FUNCTION _pg_numeric_scale(typid oid, typmod int4) RETURNS integer
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS
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$$SELECT
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CASE WHEN $1 IN (21, 23, 20) THEN 0
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WHEN $1 IN (1700) THEN
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CASE WHEN $2 = -1
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THEN null
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ELSE ($2 - 4) & 65535
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END
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ELSE null
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END$$;
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CREATE FUNCTION _pg_datetime_precision(typid oid, typmod int4) RETURNS integer
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS
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$$SELECT
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CASE WHEN $2 = -1 /* default typmod */
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THEN null
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WHEN $1 IN (1083, 1114, 1184, 1266) /* time, timestamp, same + tz */
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THEN $2
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WHEN $1 IN (1186) /* interval */
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THEN $2 & 65535
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ELSE null
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END$$;
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-- 20.3 INFORMATION_SCHEMA_CATALOG_NAME view appears later.
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@ -237,7 +364,7 @@ CREATE VIEW columns AS
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CAST(a.attname AS sql_identifier) AS column_name,
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CAST(a.attnum AS cardinal_number) AS ordinal_position,
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CAST(
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CASE WHEN u.usename = current_user THEN a.adsrc ELSE null END
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CASE WHEN u.usename = current_user THEN ad.adsrc ELSE null END
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AS character_data)
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AS column_default,
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CAST(CASE WHEN a.attnotnull OR (t.typtype = 'd' AND t.typnotnull) THEN 'NO' ELSE 'YES' END
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@ -258,83 +385,32 @@ CREATE VIEW columns AS
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AS data_type,
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CAST(
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CASE WHEN t.typtype = 'd' THEN
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CASE WHEN t.typbasetype IN (1042, 1043) AND t.typtypmod <> -1
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THEN t.typtypmod - 4 /* char, varchar */
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WHEN t.typbasetype IN (1560, 1562) AND t.typtypmod <> -1
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THEN t.typtypmod /* bit, varbit */
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ELSE null END
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ELSE
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CASE WHEN a.atttypid IN (1042, 1043) AND a.atttypmod <> -1
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THEN a.atttypmod - 4
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WHEN a.atttypid IN (1560, 1562) AND a.atttypmod <> -1
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THEN a.atttypmod
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ELSE null END
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END
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_pg_char_max_length(_pg_truetypid(a, t), _pg_truetypmod(a, t))
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AS cardinal_number)
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AS character_maximum_length,
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CAST(
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CASE WHEN t.typtype = 'd' THEN
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CASE WHEN t.typbasetype IN (25, 1042, 1043) THEN 2^30 ELSE null END
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ELSE
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CASE WHEN a.atttypid IN (25, 1042, 1043) THEN 2^30 ELSE null END
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END
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_pg_char_octet_length(_pg_truetypid(a, t), _pg_truetypmod(a, t))
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AS cardinal_number)
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AS character_octet_length,
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CAST(
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CASE (CASE WHEN t.typtype = 'd' THEN t.typbasetype ELSE a.atttypid END)
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WHEN 21 /*int2*/ THEN 16
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WHEN 23 /*int4*/ THEN 32
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WHEN 20 /*int8*/ THEN 64
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WHEN 1700 /*numeric*/ THEN ((CASE WHEN t.typtype = 'd' THEN t.typtypmod ELSE a.atttypmod END - 4) >> 16) & 65535
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WHEN 700 /*float4*/ THEN 24 /*FLT_MANT_DIG*/
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WHEN 701 /*float8*/ THEN 53 /*DBL_MANT_DIG*/
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ELSE null END
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_pg_numeric_precision(_pg_truetypid(a, t), _pg_truetypmod(a, t))
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AS cardinal_number)
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AS numeric_precision,
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CAST(
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CASE WHEN t.typtype = 'd' THEN
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CASE WHEN t.typbasetype IN (21, 23, 20, 700, 701) THEN 2
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WHEN t.typbasetype IN (1700) THEN 10
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ELSE null END
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ELSE
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CASE WHEN a.atttypid IN (21, 23, 20, 700, 701) THEN 2
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WHEN a.atttypid IN (1700) THEN 10
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ELSE null END
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END
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_pg_numeric_precision_radix(_pg_truetypid(a, t), _pg_truetypmod(a, t))
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AS cardinal_number)
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AS numeric_precision_radix,
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CAST(
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CASE WHEN t.typtype = 'd' THEN
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CASE WHEN t.typbasetype IN (21, 23, 20) THEN 0
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WHEN t.typbasetype IN (1700) THEN (t.typtypmod - 4) & 65535
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ELSE null END
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ELSE
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CASE WHEN a.atttypid IN (21, 23, 20) THEN 0
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WHEN a.atttypid IN (1700) THEN (a.atttypmod - 4) & 65535
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ELSE null END
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END
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_pg_numeric_scale(_pg_truetypid(a, t), _pg_truetypmod(a, t))
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AS cardinal_number)
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AS numeric_scale,
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CAST(
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CASE WHEN t.typtype = 'd' THEN
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CASE WHEN t.typbasetype IN (1083, 1114, 1184, 1266)
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THEN (CASE WHEN t.typtypmod <> -1 THEN t.typtypmod ELSE null END)
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WHEN t.typbasetype IN (1186)
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THEN (CASE WHEN t.typtypmod <> -1 THEN t.typtypmod & 65535 ELSE null END)
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ELSE null END
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ELSE
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CASE WHEN a.atttypid IN (1083, 1114, 1184, 1266)
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THEN (CASE WHEN a.atttypmod <> -1 THEN a.atttypmod ELSE null END)
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WHEN a.atttypid IN (1186)
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THEN (CASE WHEN a.atttypmod <> -1 THEN a.atttypmod & 65535 ELSE null END)
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ELSE null END
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END
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_pg_datetime_precision(_pg_truetypid(a, t), _pg_truetypmod(a, t))
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AS cardinal_number)
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AS datetime_precision,
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@ -368,7 +444,7 @@ CREATE VIEW columns AS
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CAST(a.attnum AS sql_identifier) AS dtd_identifier,
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CAST('NO' AS character_data) AS is_self_referencing
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FROM (pg_attribute LEFT JOIN pg_attrdef ON attrelid = adrelid AND attnum = adnum) AS a,
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FROM (pg_attribute a LEFT JOIN pg_attrdef ad ON attrelid = adrelid AND attnum = adnum),
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pg_class c, pg_namespace nc, pg_user u,
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(pg_type t JOIN pg_namespace nt ON (t.typnamespace = nt.oid))
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LEFT JOIN (pg_type bt JOIN pg_namespace nbt ON (bt.typnamespace = nbt.oid))
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@ -395,14 +471,6 @@ GRANT SELECT ON columns TO PUBLIC;
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* CONSTRAINT_COLUMN_USAGE view
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*/
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/* This returns the integers from 1 to INDEX_MAX_KEYS/FUNC_MAX_ARGS */
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CREATE FUNCTION _pg_keypositions() RETURNS SETOF integer
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LANGUAGE sql
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IMMUTABLE
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AS 'select g.s
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from generate_series(1,current_setting(''max_index_keys'')::int,1)
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as g(s)';
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CREATE VIEW constraint_column_usage AS
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SELECT CAST(current_database() AS sql_identifier) AS table_catalog,
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CAST(tblschema AS sql_identifier) AS table_schema,
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@ -551,16 +619,12 @@ CREATE VIEW domains AS
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AS data_type,
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CAST(
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CASE WHEN t.typbasetype IN (1042, 1043) AND t.typtypmod <> -1
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THEN t.typtypmod - 4 /* char, varchar */
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WHEN t.typbasetype IN (1560, 1562) AND t.typtypmod <> -1
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THEN t.typtypmod /* bit, varbit */
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ELSE null END
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_pg_char_max_length(t.typbasetype, t.typtypmod)
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AS cardinal_number)
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AS character_maximum_length,
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CAST(
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CASE WHEN t.typbasetype IN (25, 1042, 1043) THEN 2^30 ELSE null END
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_pg_char_octet_length(t.typbasetype, t.typtypmod)
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AS cardinal_number)
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AS character_octet_length,
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@ -573,37 +637,22 @@ CREATE VIEW domains AS
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CAST(null AS sql_identifier) AS collation_name,
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CAST(
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CASE t.typbasetype
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WHEN 21 /*int2*/ THEN 16
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WHEN 23 /*int4*/ THEN 32
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WHEN 20 /*int8*/ THEN 64
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WHEN 1700 /*numeric*/ THEN ((t.typtypmod - 4) >> 16) & 65535
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WHEN 700 /*float4*/ THEN 24 /*FLT_MANT_DIG*/
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WHEN 701 /*float8*/ THEN 53 /*DBL_MANT_DIG*/
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ELSE null END
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_pg_numeric_precision(t.typbasetype, t.typtypmod)
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AS cardinal_number)
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AS numeric_precision,
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CAST(
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CASE WHEN t.typbasetype IN (21, 23, 20, 700, 701) THEN 2
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WHEN t.typbasetype IN (1700) THEN 10
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ELSE null END
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_pg_numeric_precision_radix(t.typbasetype, t.typtypmod)
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AS cardinal_number)
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AS numeric_precision_radix,
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CAST(
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CASE WHEN t.typbasetype IN (21, 23, 20) THEN 0
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WHEN t.typbasetype IN (1700) THEN (t.typtypmod - 4) & 65535
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ELSE null END
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_pg_numeric_scale(t.typbasetype, t.typtypmod)
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AS cardinal_number)
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AS numeric_scale,
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CAST(
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CASE WHEN t.typbasetype IN (1083, 1114, 1184, 1266)
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THEN (CASE WHEN t.typtypmod <> -1 THEN t.typtypmod ELSE null END)
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WHEN t.typbasetype IN (1186)
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THEN (CASE WHEN t.typtypmod <> -1 THEN t.typtypmod & 65535 ELSE null END)
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ELSE null END
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_pg_datetime_precision(t.typbasetype, t.typtypmod)
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AS cardinal_number)
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AS datetime_precision,
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@ -740,18 +789,6 @@ GRANT SELECT ON parameters TO PUBLIC;
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* REFERENTIAL_CONSTRAINTS view
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*/
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CREATE FUNCTION _pg_keyissubset(smallint[], smallint[]) RETURNS boolean
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS 'select $1[1] is null or ($1[1] = any ($2) and coalesce(information_schema._pg_keyissubset($1[2:pg_catalog.array_upper($1,1)], $2), true))';
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CREATE FUNCTION _pg_keysequal(smallint[], smallint[]) RETURNS boolean
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LANGUAGE sql
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IMMUTABLE
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RETURNS NULL ON NULL INPUT
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AS 'select information_schema._pg_keyissubset($1, $2) and information_schema._pg_keyissubset($2, $1)';
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CREATE VIEW referential_constraints AS
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SELECT CAST(current_database() AS sql_identifier) AS constraint_catalog,
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CAST(ncon.nspname AS sql_identifier) AS constraint_schema,
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