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This enables external code to create access methods. This is useful so that extensions can add their own access methods which can be formally tracked for dependencies, so that DROP operates correctly. Also, having explicit support makes pg_dump work correctly. Currently only index AMs are supported, but we expect different types to be added in the future. Authors: Alexander Korotkov, Petr Jelínek Reviewed-By: Teodor Sigaev, Petr Jelínek, Jim Nasby Commitfest-URL: https://commitfest.postgresql.org/9/353/ Discussion: https://www.postgresql.org/message-id/CAPpHfdsXwZmojm6Dx+TJnpYk27kT4o7Ri6X_4OSWcByu1Rm+VA@mail.gmail.com
74 lines
2.1 KiB
SQL
74 lines
2.1 KiB
SQL
--
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-- Create access method tests
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--
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-- Make gist2 over gisthandler. In fact, it would be a synonym to gist.
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CREATE ACCESS METHOD gist2 TYPE INDEX HANDLER gisthandler;
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-- Drop old index on fast_emp4000
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DROP INDEX grect2ind;
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-- Try to create gist2 index on fast_emp4000: fail because opclass doesn't exist
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CREATE INDEX grect2ind ON fast_emp4000 USING gist2 (home_base);
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-- Make operator class for boxes using gist2
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CREATE OPERATOR CLASS box_ops DEFAULT
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FOR TYPE box USING gist2 AS
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OPERATOR 1 <<,
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OPERATOR 2 &<,
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OPERATOR 3 &&,
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OPERATOR 4 &>,
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OPERATOR 5 >>,
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OPERATOR 6 ~=,
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OPERATOR 7 @>,
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OPERATOR 8 <@,
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OPERATOR 9 &<|,
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OPERATOR 10 <<|,
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OPERATOR 11 |>>,
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OPERATOR 12 |&>,
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OPERATOR 13 ~,
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OPERATOR 14 @,
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FUNCTION 1 gist_box_consistent(internal, box, smallint, oid, internal),
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FUNCTION 2 gist_box_union(internal, internal),
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FUNCTION 3 gist_box_compress(internal),
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FUNCTION 4 gist_box_decompress(internal),
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FUNCTION 5 gist_box_penalty(internal, internal, internal),
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FUNCTION 6 gist_box_picksplit(internal, internal),
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FUNCTION 7 gist_box_same(box, box, internal),
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FUNCTION 9 gist_box_fetch(internal);
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-- Create gist2 index on fast_emp4000
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CREATE INDEX grect2ind ON fast_emp4000 USING gist2 (home_base);
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-- Now check the results from plain indexscan
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SET enable_seqscan = OFF;
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SET enable_indexscan = ON;
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SET enable_bitmapscan = OFF;
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EXPLAIN (COSTS OFF)
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SELECT * FROM fast_emp4000
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WHERE home_base @ '(200,200),(2000,1000)'::box
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ORDER BY (home_base[0])[0];
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SELECT * FROM fast_emp4000
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WHERE home_base @ '(200,200),(2000,1000)'::box
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ORDER BY (home_base[0])[0];
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EXPLAIN (COSTS OFF)
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SELECT count(*) FROM fast_emp4000 WHERE home_base && '(1000,1000,0,0)'::box;
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SELECT count(*) FROM fast_emp4000 WHERE home_base && '(1000,1000,0,0)'::box;
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EXPLAIN (COSTS OFF)
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SELECT count(*) FROM fast_emp4000 WHERE home_base IS NULL;
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SELECT count(*) FROM fast_emp4000 WHERE home_base IS NULL;
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-- Try to drop access method: fail because of depending objects
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DROP ACCESS METHOD gist2;
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-- Drop access method cascade
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DROP ACCESS METHOD gist2 CASCADE;
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-- Reset optimizer options
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RESET enable_seqscan;
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RESET enable_indexscan;
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RESET enable_bitmapscan;
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