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abramshabramsh
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Fix expected widths/explain for PG18
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‎test-3.9/expected/multicorn_test_limit_2.out‎

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SET client_min_messages=NOTICE;
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CREATE EXTENSION multicorn;
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CREATE server multicorn_srv foreign data wrapper multicorn options (
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wrapper 'multicorn.testfdw.TestForeignDataWrapper'
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);
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CREATE user mapping FOR current_user server multicorn_srv options (usermapping 'test');
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CREATE foreign table testmulticorn (
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test1 date,
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test2 timestamp
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) server multicorn_srv options (
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option1 'option1',
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test_type 'date',
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canlimit 'true',
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cansort 'true'
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);
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CREATE foreign table testmulticorn_nolimit(
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test1 date,
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test2 timestamp
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) server multicorn_srv options (
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option1 'option1',
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test_type 'date',
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canlimit 'false',
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cansort 'true'
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);
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CREATE foreign table testmulticorn_nosort(
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test1 date,
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test2 timestamp
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) server multicorn_srv options (
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option1 'option1',
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test_type 'date',
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canlimit 'true',
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cansort 'false'
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);
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-- Verify limit and offset are not pushed down when FWD says "no" (but still returns the 1 correct row)
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EXPLAIN SELECT * FROM testmulticorn_nolimit LIMIT 1 OFFSET 1;
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NOTICE: [('canlimit', 'false'), ('cansort', 'true'), ('option1', 'option1'), ('test_type', 'date'), ('usermapping', 'test')]
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NOTICE: [('test1', 'date'), ('test2', 'timestamp without time zone')]
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QUERY PLAN
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------------------------------------------------------------------------------------
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Limit (cost=29.50..49.00 rows=1 width=20)
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-> Foreign Scan on testmulticorn_nolimit (cost=10.00..400.00 rows=20 width=20)
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(2 rows)
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SELECT * FROM testmulticorn_nolimit LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1', 'test2']
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test1 | test2
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------------+--------------------------
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02-03-2011 | Tue Feb 01 14:30:25 2011
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(1 row)
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-- Verify limit and offset are pushed down when FWD says "yes" (returns just 1 row with proper cost)
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EXPLAIN SELECT * FROM testmulticorn LIMIT 1 OFFSET 1;
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NOTICE: [('canlimit', 'true'), ('cansort', 'true'), ('option1', 'option1'), ('test_type', 'date'), ('usermapping', 'test')]
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NOTICE: [('test1', 'date'), ('test2', 'timestamp without time zone')]
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QUERY PLAN
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--------------------------------------------------------------------
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Foreign Scan on testmulticorn (cost=10.00..20.00 rows=1 width=20)
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(1 row)
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SELECT * FROM testmulticorn LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1', 'test2']
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test1 | test2
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------------+--------------------------
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02-03-2011 | Tue Feb 01 14:30:25 2011
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(1 row)
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-- Verify limit and offset w/ sort not pushed down (still returns the 1 correct row)
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EXPLAIN SELECT * FROM testmulticorn_nolimit ORDER BY test1 LIMIT 1 OFFSET 1;
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QUERY PLAN
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------------------------------------------------------------------------------------
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Limit (cost=29.50..49.00 rows=1 width=20)
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-> Foreign Scan on testmulticorn_nolimit (cost=10.00..400.00 rows=20 width=20)
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(2 rows)
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SELECT * FROM testmulticorn_nolimit ORDER BY test1 LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1', 'test2']
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NOTICE: requested sort(s):
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NOTICE: SortKey(attname='test1', attnum=1, is_reversed=False, nulls_first=False, collate=None)
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test1 | test2
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------------+--------------------------
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01-01-2011 | Sun Jan 02 14:30:25 2011
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(1 row)
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-- Verify limit and offset w/ sort are pushed down (returns just 1 row with proper cost)
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EXPLAIN SELECT * FROM testmulticorn ORDER BY test1 LIMIT 1 OFFSET 1;
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QUERY PLAN
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--------------------------------------------------------------------
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Foreign Scan on testmulticorn (cost=10.00..20.00 rows=1 width=20)
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(1 row)
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SELECT * FROM testmulticorn ORDER BY test1 LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1', 'test2']
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NOTICE: requested sort(s):
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NOTICE: SortKey(attname='test1', attnum=1, is_reversed=False, nulls_first=False, collate=None)
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test1 | test2
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------------+--------------------------
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01-01-2011 | Sun Jan 02 14:30:25 2011
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(1 row)
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-- Verify limit and offset are not pushed when sort is not pushed down
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EXPLAIN SELECT * FROM testmulticorn_nosort ORDER BY test1 LIMIT 1 OFFSET 1;
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NOTICE: [('canlimit', 'true'), ('cansort', 'false'), ('option1', 'option1'), ('test_type', 'date'), ('usermapping', 'test')]
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NOTICE: [('test1', 'date'), ('test2', 'timestamp without time zone')]
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QUERY PLAN
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-----------------------------------------------------------------------------------------
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Limit (cost=400.20..400.20 rows=1 width=20)
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-> Sort (cost=400.20..400.25 rows=20 width=20)
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Sort Key: test1
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-> Foreign Scan on testmulticorn_nosort (cost=10.00..400.00 rows=20 width=20)
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(4 rows)
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SELECT * FROM testmulticorn_nosort ORDER BY test1 LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1', 'test2']
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test1 | test2
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------------+--------------------------
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01-01-2011 | Sun Jan 02 14:30:25 2011
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(1 row)
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-- Verify limit and offset are not pushed when sort is partially pushed down
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EXPLAIN SELECT * FROM testmulticorn ORDER BY test1, test2 LIMIT 1 OFFSET 1;
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QUERY PLAN
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----------------------------------------------------------------------------------
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Limit (cost=48.08..66.65 rows=1 width=20)
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-> Incremental Sort (cost=29.51..400.90 rows=20 width=20)
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Sort Key: test1, test2
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Presorted Key: test1
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-> Foreign Scan on testmulticorn (cost=10.00..400.00 rows=20 width=20)
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(5 rows)
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SELECT * FROM testmulticorn ORDER BY test1, test2 LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1', 'test2']
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NOTICE: requested sort(s):
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NOTICE: SortKey(attname='test1', attnum=1, is_reversed=False, nulls_first=False, collate=None)
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test1 | test2
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------------+--------------------------
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01-01-2011 | Sun Jan 02 14:30:25 2011
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(1 row)
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-- Verify limit and offset are not pushed down with where (which we may eventually support in the future)
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EXPLAIN SELECT * FROM testmulticorn WHERE test1 = '02-03-2011' LIMIT 1 OFFSET 1;
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QUERY PLAN
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----------------------------------------------------------------------------
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Limit (cost=29.50..49.00 rows=1 width=20)
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-> Foreign Scan on testmulticorn (cost=10.00..400.00 rows=20 width=20)
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Filter: (test1 = '02-03-2011'::date)
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(3 rows)
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SELECT * FROM testmulticorn WHERE test1 = '02-03-2011' LIMIT 1 OFFSET 1;
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NOTICE: [test1 = 2011-02-03]
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NOTICE: ['test1', 'test2']
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test1 | test2
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------------+--------------------------
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02-03-2011 | Tue Feb 01 14:30:25 2011
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(1 row)
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-- Verify limit and offset are not pushed down with group by
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EXPLAIN SELECT max(test1) FROM testmulticorn GROUP BY test1 LIMIT 1 OFFSET 1;
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QUERY PLAN
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----------------------------------------------------------------------------------
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Limit (cost=19.52..29.03 rows=1 width=8)
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-> GroupAggregate (cost=10.00..200.30 rows=20 width=8)
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Group Key: test1
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-> Foreign Scan on testmulticorn (cost=10.00..200.00 rows=20 width=10)
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(4 rows)
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SELECT max(test1) FROM testmulticorn GROUP BY test1 LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1']
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NOTICE: requested sort(s):
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NOTICE: SortKey(attname='test1', attnum=1, is_reversed=False, nulls_first=False, collate=None)
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max
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------------
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02-03-2011
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(1 row)
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-- Verify limit and offset are not pushed down with window functions
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EXPLAIN SELECT max(test1) OVER (ORDER BY test1) FROM testmulticorn LIMIT 1 OFFSET 1;
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QUERY PLAN
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----------------------------------------------------------------------------------
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Limit (cost=28.55..37.59 rows=1 width=8)
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-> WindowAgg (cost=19.52..200.30 rows=20 width=8)
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Window: w1 AS (ORDER BY test1)
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-> Foreign Scan on testmulticorn (cost=10.00..200.00 rows=20 width=10)
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(4 rows)
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SELECT max(test1) OVER (ORDER BY test1) FROM testmulticorn LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1']
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NOTICE: requested sort(s):
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NOTICE: SortKey(attname='test1', attnum=1, is_reversed=False, nulls_first=False, collate=None)
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max
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------------
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01-01-2011
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(1 row)
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-- Verify limit and offset are not pushed down with joins
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-- TODO: optimize by pushing down limit/offset on one side of the join
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EXPLAIN SELECT * FROM testmulticorn m1 JOIN testmulticorn m2 ON m1.test1 = m2.test1 LIMIT 1 OFFSET 1;
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QUERY PLAN
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-------------------------------------------------------------------------------------------
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Limit (cost=59.30..98.61 rows=1 width=24)
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-> Nested Loop (cost=20.00..806.05 rows=20 width=24)
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Join Filter: (m1.test1 = m2.test1)
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-> Foreign Scan on testmulticorn m1 (cost=10.00..400.00 rows=20 width=20)
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-> Materialize (cost=10.00..400.10 rows=20 width=20)
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-> Foreign Scan on testmulticorn m2 (cost=10.00..400.00 rows=20 width=20)
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(6 rows)
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SELECT * FROM testmulticorn m1 JOIN testmulticorn m2 ON m1.test1 = m2.test1 LIMIT 1 OFFSET 1;
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NOTICE: []
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NOTICE: ['test1', 'test2']
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NOTICE: []
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NOTICE: ['test1', 'test2']
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test1 | test2 | test1 | test2
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------------+--------------------------+------------+--------------------------
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01-01-2011 | Sun Jan 02 14:30:25 2011 | 01-01-2011 | Sun Jan 02 14:30:25 2011
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(1 row)
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DROP USER MAPPING FOR current_user SERVER multicorn_srv;
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DROP EXTENSION multicorn cascade;
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NOTICE: drop cascades to 4 other objects
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DETAIL: drop cascades to server multicorn_srv
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drop cascades to foreign table testmulticorn
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drop cascades to foreign table testmulticorn_nolimit
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drop cascades to foreign table testmulticorn_nosort

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