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Merge pull request #238 from CartoDB/235-column-names

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Optimize column information functions
This commit is contained in:
Javier Goizueta 2016-04-25 17:30:07 +02:00
commit 18267477da
3 changed files with 22 additions and 27 deletions
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16
scripts-available/CDB_ColumnNames.sql
View File

@ -2,15 +2,13 @@
CREATE OR REPLACE FUNCTION CDB_ColumnNames(REGCLASS)
RETURNS SETOF information_schema.sql_identifier
AS $$
SELECT c.column_name
FROM information_schema.columns c, pg_class _tn, pg_namespace _sn
WHERE table_name = _tn.relname
AND table_schema = _sn.nspname
AND _tn.oid = $1::oid
AND _sn.oid = _tn.relnamespace
ORDER BY ordinal_position;
SELECT
a.attname::information_schema.sql_identifier column_name
FROM pg_class c
LEFT JOIN pg_attribute a ON a.attrelid = c.oid
WHERE c.oid = $1::oid
AND a.attstattarget < 0 -- exclude system columns
ORDER BY a.attnum;
$$ LANGUAGE SQL;
-- This is to migrate from pre-0.2.0 version

16
scripts-available/CDB_ColumnType.sql
View File

@ -2,15 +2,13 @@
CREATE OR REPLACE FUNCTION CDB_ColumnType(REGCLASS, TEXT)
RETURNS information_schema.character_data
AS $$
SELECT c.data_type
FROM information_schema.columns c, pg_class _tn, pg_namespace _sn
WHERE table_name = _tn.relname
AND table_schema = _sn.nspname
AND column_name = $2
AND _tn.oid = $1::oid
AND _sn.oid = _tn.relnamespace;
SELECT
format_type(a.atttypid, NULL)::information_schema.character_data data_type
FROM pg_class c
LEFT JOIN pg_attribute a ON a.attrelid = c.oid
WHERE c.oid = $1::oid
AND a.attname = $2
AND a.attstattarget < 0; -- exclude system columns
$$ LANGUAGE SQL;
-- This is to migrate from pre-0.2.0 version

17
scripts-available/CDB_Overviews.sql
View File

@ -520,15 +520,14 @@ CREATE OR REPLACE FUNCTION _cdb_unlimited_text_column(reloid REGCLASS, col_name
RETURNS BOOLEAN
AS $$
SELECT EXISTS (
SELECT *
FROM information_schema.columns c, pg_class _tn, pg_namespace _sn
WHERE table_name = _tn.relname
AND table_schema = _sn.nspname
AND c.column_name = col_name
AND _tn.oid = reloid
AND _sn.oid = _tn.relnamespace
AND character_maximum_length IS NULL
AND c.data_type IN ('text', 'character varying', 'character')
SELECT a.attname
FROM pg_class c
LEFT JOIN pg_attribute a ON a.attrelid = c.oid
LEFT JOIN pg_type t ON t.oid = a.atttypid
WHERE c.oid = reloid
AND a.attname = col_name
AND format_type(a.atttypid, NULL) IN ('text', 'character varying', 'character')
AND format_type(a.atttypid, NULL) = format_type(a.atttypid, a.atttypmod)
);
$$ LANGUAGE SQL STABLE;