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|
----
-- Regression test to Global Temporary Table implementation
--
-- Test for GTT with index, the temporary table must have the
-- index too.
--
----
-- Create a GTT like table
CREATE /*GLOBAL*/ TEMPORARY TABLE t_glob_temptable1 (id integer, lbl text) ON COMMIT PRESERVE ROWS;
SET pgtt.enabled TO off;
CREATE INDEX ON pgtt_schema.t_glob_temptable1 (id);
CREATE INDEX ON pgtt_schema.t_glob_temptable1 (lbl);
-- Look at Global Temporary Table definition
SELECT nspname, relname, preserved, code FROM pgtt_schema.pg_global_temp_tables;
nspname | relname | preserved | code
-------------+-------------------+-----------+----------------------
pgtt_schema | t_glob_temptable1 | t | id integer, lbl text
(1 row)
-- A "template" unlogged table should exists
SELECT a.attname,
pg_catalog.format_type(a.atttypid, a.atttypmod),
(SELECT substring(pg_catalog.pg_get_expr(d.adbin, d.adrelid, true) for 128)
FROM pg_catalog.pg_attrdef d
WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef),
a.attnotnull,
pg_catalog.col_description(a.attrelid, a.attnum)
FROM pg_catalog.pg_attribute a
WHERE a.attrelid = (
SELECT c.oid FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace WHERE c.relname = 't_glob_temptable1' AND n.nspname = 'pgtt_schema'
) AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum;
attname | format_type | substring | attnotnull | col_description
---------+-------------+-----------+------------+-----------------
id | integer | | f |
lbl | text | | f |
(2 rows)
-- With indexes still defined
SELECT c2.relname, i.indisprimary, i.indisunique, pg_catalog.pg_get_indexdef(i.indexrelid, 0, true),
pg_catalog.pg_get_constraintdef(con.oid, true), contype
FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i
LEFT JOIN pg_catalog.pg_constraint con ON (conrelid = i.indrelid AND conindid = i.indexrelid AND contype IN ('p','u','x'))
WHERE c.oid = (
SELECT c.oid FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace WHERE c.relname = 't_glob_temptable1' AND n.nspname = 'pgtt_schema'
) AND c.oid = i.indrelid AND i.indexrelid = c2.oid
ORDER BY i.indisprimary DESC, c2.relname;
relname | indisprimary | indisunique | pg_get_indexdef | pg_get_constraintdef | contype
---------------------------+--------------+-------------+-------------------------------------------------------------------------------+----------------------+---------
t_glob_temptable1_id_idx | f | f | CREATE INDEX t_glob_temptable1_id_idx ON t_glob_temptable1 USING btree (id) | |
t_glob_temptable1_lbl_idx | f | f | CREATE INDEX t_glob_temptable1_lbl_idx ON t_glob_temptable1 USING btree (lbl) | |
(2 rows)
SET pgtt.enabled TO on;
-- With the first insert some value in the temporary table
INSERT INTO t_glob_temptable1 VALUES (1, 'One');
-- Look if we have two tables now
SELECT regexp_replace(n.nspname, '\d+', 'x', 'g'), c.relname FROM pg_class c JOIN pg_namespace n ON (c.relnamespace=n.oid) WHERE relname = 't_glob_temptable1';
regexp_replace | relname
----------------+-------------------
pgtt_schema | t_glob_temptable1
pg_temp_x | t_glob_temptable1
(2 rows)
-- and that the temporary table has the indexes too
SELECT tablename, indexname FROM pg_indexes WHERE tablename = 't_glob_temptable1' and schemaname LIKE 'pg_temp_%' ORDER BY tablename, indexname;
tablename | indexname
-------------------+---------------------------
t_glob_temptable1 | t_glob_temptable1_id_idx
t_glob_temptable1 | t_glob_temptable1_lbl_idx
(2 rows)
INSERT INTO t_glob_temptable1 VALUES (2, 'two');
-- Verify that the index is used
SET enable_bitmapscan TO off;
EXPLAIN (COSTS OFF) SELECT * FROM t_glob_temptable1 WHERE id = 2;
QUERY PLAN
----------------------------------------------------------------
Index Scan using t_glob_temptable1_id_idx on t_glob_temptable1
Index Cond: (id = 2)
(2 rows)
-- Reconnect and drop it
\c - -
-- Cleanup
DROP TABLE t_glob_temptable1;
-- Create a GTT like table
CREATE /*GLOBAL*/ TEMPORARY TABLE t_glob_temptable2 (id integer, lbl text) ON COMMIT PRESERVE ROWS;
CREATE INDEX ON t_glob_temptable2 (id);
SELECT * FROM t_glob_temptable2;
id | lbl
----+-----
(0 rows)
-- Must complain that the GTT is in use
CREATE INDEX ON t_glob_temptable2 (lbl);
ERROR: a temporary table has been created and is active, can not add an index on the GTT table in this session.
SELECT pg_catalog.pg_get_indexdef(i.indexrelid, 0, true)
FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i
LEFT JOIN pg_catalog.pg_constraint con ON (conrelid = i.indrelid AND conindid = i.indexrelid AND contype IN ('p','u','x'))
WHERE c.oid = 'pgtt_schema.t_glob_temptable2'::regclass::oid AND c.oid = i.indrelid AND i.indexrelid = c2.oid
ORDER BY i.indisprimary DESC, c2.relname;
pg_get_indexdef
-----------------------------------------------------------------------------------------
CREATE INDEX t_glob_temptable2_id_idx ON pgtt_schema.t_glob_temptable2 USING btree (id)
(1 row)
-- Check that we do not break LIKE ... USING INDEXES
CREATE TABLE tb_with_index (id integer PRIMARY KEY, lbl varchar);
CREATE INDEX ON tb_with_index(lbl);
CREATE TEMPORARY TABLE temptb_with_index (LIKE tb_with_index INCLUDING INDEXES);
SELECT c2.relname, pg_catalog.pg_get_indexdef(i.indexrelid, 0, true), pg_catalog.pg_get_constraintdef(con.oid, true)
FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index i
LEFT JOIN pg_catalog.pg_constraint con ON (conrelid = i.indrelid AND conindid = i.indexrelid AND contype IN ('p','u','x'))
WHERE c.oid = 'temptb_with_index'::regclass AND c.oid = i.indrelid AND i.indexrelid = c2.oid
ORDER BY i.indisprimary DESC, c2.relname;
relname | pg_get_indexdef | pg_get_constraintdef
---------------------------+----------------------------------------------------------------------------------+----------------------
temptb_with_index_pkey | CREATE UNIQUE INDEX temptb_with_index_pkey ON temptb_with_index USING btree (id) | PRIMARY KEY (id)
temptb_with_index_lbl_idx | CREATE INDEX temptb_with_index_lbl_idx ON temptb_with_index USING btree (lbl) |
(2 rows)
\c - -
DROP TABLE t_glob_temptable2;
|
