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Move fdw-aware functions to CDB_ForeignTable.sql

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This commit is contained in:
Rafa de la Torre 2016-02-09 13:40:18 +01:00
parent eb84dd04c9
commit ecbdb4a430
2 changed files with 66 additions and 65 deletions
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66
scripts-available/CDB_ForeignTable.sql
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@ -130,3 +130,69 @@ BEGIN
END END
$$ $$
LANGUAGE plpgsql; LANGUAGE plpgsql;
-- Return a set of (dbname, schema_name, table_name, updated_at)
-- It is aware of foreign tables
-- It assumes the local (schema_name, table_name) map to the remote ones with the same name
CREATE OR REPLACE FUNCTION cartodb.CDB_QueryTables_Updated_At(query text)
RETURNS TABLE(db_name text, schema_name text, table_name text, updated_at timestamptz)
AS $$
WITH query_tables AS (
SELECT unnest(CDB_QueryTablesText(query)) schema_table_name
), query_tables_oid AS (
SELECT schema_table_name, schema_table_name::regclass::oid AS reloid
FROM query_tables
),
fqtn AS (
SELECT
(CASE WHEN c.relkind = 'f' THEN _cdb_dbname_of_foreign_table(query_tables_oid.reloid)
ELSE current_database()
END)::text AS dbname,
n.nspname::text schema_name,
c.relname::text table_name,
c.relkind,
query_tables_oid.reloid
FROM query_tables_oid, pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
WHERE c.oid = query_tables_oid.reloid
)
SELECT fqtn.dbname, fqtn.schema_name, fqtn.table_name,
(CASE WHEN relkind = 'f' THEN CDB_Get_Foreign_Updated_At(reloid)
ELSE (SELECT md.updated_at FROM cartodb.CDB_TableMetadata md WHERE md.tabname = reloid)
END) AS updated_at
FROM fqtn;
$$ LANGUAGE SQL;
CREATE OR REPLACE FUNCTION cartodb._cdb_dbname_of_foreign_table(reloid oid)
RETURNS TEXT AS $$
SELECT option_value FROM pg_options_to_table((
SELECT fs.srvoptions
FROM pg_foreign_table ft
LEFT JOIN pg_foreign_server fs ON ft.ftserver = fs.oid
WHERE ft.ftrelid = reloid
)) WHERE option_name='dbname';
$$ LANGUAGE SQL;
-- Return the last updated time of a set of tables
-- It is aware of foreign tables
-- It assumes the local (schema_name, table_name) map to the remote ones with the same name
CREATE OR REPLACE FUNCTION cartodb.CDB_Last_Updated_Time(tables text[])
RETURNS timestamptz AS $$
WITH t AS (
SELECT unnest(tables) AS schema_table_name
), t_oid AS (
SELECT (t.schema_table_name)::regclass::oid as reloid FROM t
), t_updated_at AS (
SELECT
(CASE WHEN relkind = 'f' THEN CDB_Get_Foreign_Updated_At(reloid)
ELSE (SELECT md.updated_at FROM cartodb.CDB_TableMetadata md WHERE md.tabname = reloid)
END) AS updated_at
FROM t_oid
LEFT JOIN pg_catalog.pg_class c ON c.oid = reloid
) SELECT max(updated_at) FROM t_updated_at;
$$ LANGUAGE SQL;

65
scripts-available/CDB_QueryTables.sql
View File

@ -76,68 +76,3 @@ BEGIN
RETURN CDB_QueryTablesText(query)::name[]; RETURN CDB_QueryTablesText(query)::name[];
END END
$$ LANGUAGE 'plpgsql' VOLATILE STRICT; $$ LANGUAGE 'plpgsql' VOLATILE STRICT;
--------------------------------------------------------------------------------
-- Return a set of (dbname, schema_name, table_name, updated_at)
-- This assumes the local (schema_name, table_name) maps to the remote one with the same name
CREATE OR REPLACE FUNCTION CDB_QueryTables_Updated_At(query text)
RETURNS TABLE(db_name text, schema_name text, table_name text, updated_at timestamptz)
AS $$
WITH query_tables AS (
SELECT unnest(CDB_QueryTablesText(query)) schema_table_name
), query_tables_oid AS (
SELECT schema_table_name, schema_table_name::regclass::oid AS reloid
FROM query_tables
),
fqtn AS (
SELECT
(CASE WHEN c.relkind = 'f' THEN _cdb_dbname_of_foreign_table(query_tables_oid.reloid)
ELSE current_database()
END)::text AS dbname,
n.nspname::text schema_name,
c.relname::text table_name,
c.relkind,
query_tables_oid.reloid
FROM query_tables_oid, pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
WHERE c.oid = query_tables_oid.reloid
)
SELECT fqtn.dbname, fqtn.schema_name, fqtn.table_name,
(CASE WHEN relkind = 'f' THEN CDB_Get_Foreign_Updated_At(reloid)
ELSE (SELECT md.updated_at FROM CDB_TableMetadata md WHERE md.tabname = reloid)
END) AS updated_at
FROM fqtn;
$$ LANGUAGE SQL;
CREATE OR REPLACE FUNCTION _cdb_dbname_of_foreign_table(reloid oid)
RETURNS TEXT AS $$
SELECT option_value FROM pg_options_to_table((
SELECT fs.srvoptions
FROM pg_foreign_table ft
LEFT JOIN pg_foreign_server fs ON ft.ftserver = fs.oid
WHERE ft.ftrelid = reloid
)) WHERE option_name='dbname';
$$ LANGUAGE SQL;
-- TODO: move to the right place
-- Return the last updated time of a set of tables
CREATE OR REPLACE FUNCTION CDB_Last_Updated_Time(tables text[])
RETURNS timestamptz AS $$
WITH t AS (
SELECT unnest(tables) AS schema_table_name
), t_oid AS (
SELECT (t.schema_table_name)::regclass::oid as reloid FROM t
), t_updated_at AS (
SELECT
(CASE WHEN relkind = 'f' THEN CDB_Get_Foreign_Updated_At(reloid)
ELSE (SELECT md.updated_at FROM CDB_TableMetadata md WHERE md.tabname = reloid)
END) AS updated_at
FROM t_oid
LEFT JOIN pg_catalog.pg_class c ON c.oid = reloid
) SELECT max(updated_at) FROM t_updated_at;
$$ LANGUAGE SQL;