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756ab29124
Author: Andrey Borodin and me Discussion: https://www.postgresql.org/message-id/3E4F9093-A1B5-4DF8-A292-0B48692E3954%40yandex-team.ru
88 lines
5.0 KiB
Plaintext
88 lines
5.0 KiB
Plaintext
CREATE TABLE test_gist AS SELECT point(i,i) p, i::text t FROM
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generate_series(1,1000) i;
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CREATE INDEX test_gist_idx ON test_gist USING gist (p);
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-- Page 0 is the root, the rest are leaf pages
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SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 0));
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lsn | nsn | rightlink | flags
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-----+-----+------------+-------
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0/1 | 0/0 | 4294967295 | {}
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(1 row)
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SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 1));
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lsn | nsn | rightlink | flags
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-----+-----+------------+--------
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0/1 | 0/0 | 4294967295 | {leaf}
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(1 row)
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SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 2));
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lsn | nsn | rightlink | flags
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-----+-----+-----------+--------
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0/1 | 0/0 | 1 | {leaf}
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(1 row)
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SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 0), 'test_gist_idx');
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itemoffset | ctid | itemlen | keys
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------------+-----------+---------+-------------------
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1 | (1,65535) | 40 | (p)=((166,166))
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2 | (2,65535) | 40 | (p)=((332,332))
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3 | (3,65535) | 40 | (p)=((498,498))
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4 | (4,65535) | 40 | (p)=((664,664))
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5 | (5,65535) | 40 | (p)=((830,830))
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6 | (6,65535) | 40 | (p)=((996,996))
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7 | (7,65535) | 40 | (p)=((1000,1000))
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(7 rows)
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SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 1), 'test_gist_idx') LIMIT 5;
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itemoffset | ctid | itemlen | keys
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------------+-------+---------+-------------
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1 | (0,1) | 40 | (p)=((1,1))
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2 | (0,2) | 40 | (p)=((2,2))
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3 | (0,3) | 40 | (p)=((3,3))
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4 | (0,4) | 40 | (p)=((4,4))
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5 | (0,5) | 40 | (p)=((5,5))
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(5 rows)
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SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 2), 'test_gist_idx') LIMIT 5;
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itemoffset | ctid | itemlen | keys
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------------+--------+---------+-----------------
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1 | (1,10) | 40 | (p)=((167,167))
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2 | (1,11) | 40 | (p)=((168,168))
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3 | (1,12) | 40 | (p)=((169,169))
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4 | (1,13) | 40 | (p)=((170,170))
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5 | (1,14) | 40 | (p)=((171,171))
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(5 rows)
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SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 0));
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itemoffset | ctid | itemlen | key_data
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------------+-----------+---------+------------------------------------------------------------------------------------
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1 | (1,65535) | 40 | \x00000100ffff28000000000000c064400000000000c06440000000000000f03f000000000000f03f
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2 | (2,65535) | 40 | \x00000200ffff28000000000000c074400000000000c074400000000000e064400000000000e06440
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3 | (3,65535) | 40 | \x00000300ffff28000000000000207f400000000000207f400000000000d074400000000000d07440
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4 | (4,65535) | 40 | \x00000400ffff28000000000000c084400000000000c084400000000000307f400000000000307f40
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5 | (5,65535) | 40 | \x00000500ffff28000000000000f089400000000000f089400000000000c884400000000000c88440
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6 | (6,65535) | 40 | \x00000600ffff28000000000000208f400000000000208f400000000000f889400000000000f88940
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7 | (7,65535) | 40 | \x00000700ffff28000000000000408f400000000000408f400000000000288f400000000000288f40
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(7 rows)
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SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 1)) LIMIT 5;
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itemoffset | ctid | itemlen | key_data
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------------+-------+---------+------------------------------------------------------------------------------------
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1 | (0,1) | 40 | \x0000000001002800000000000000f03f000000000000f03f000000000000f03f000000000000f03f
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2 | (0,2) | 40 | \x00000000020028000000000000000040000000000000004000000000000000400000000000000040
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3 | (0,3) | 40 | \x00000000030028000000000000000840000000000000084000000000000008400000000000000840
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4 | (0,4) | 40 | \x00000000040028000000000000001040000000000000104000000000000010400000000000001040
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5 | (0,5) | 40 | \x00000000050028000000000000001440000000000000144000000000000014400000000000001440
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(5 rows)
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SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 2)) LIMIT 5;
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itemoffset | ctid | itemlen | key_data
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------------+--------+---------+------------------------------------------------------------------------------------
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1 | (1,10) | 40 | \x000001000a0028000000000000e064400000000000e064400000000000e064400000000000e06440
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2 | (1,11) | 40 | \x000001000b0028000000000000006540000000000000654000000000000065400000000000006540
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3 | (1,12) | 40 | \x000001000c0028000000000000206540000000000020654000000000002065400000000000206540
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4 | (1,13) | 40 | \x000001000d0028000000000000406540000000000040654000000000004065400000000000406540
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5 | (1,14) | 40 | \x000001000e0028000000000000606540000000000060654000000000006065400000000000606540
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(5 rows)
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DROP TABLE test_gist;
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