126 lines
4.9 KiB
Plaintext
126 lines
4.9 KiB
Plaintext
-- The gist_page_opaque_info() function prints the page's LSN.
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-- Use an unlogged index, so that the LSN is predictable.
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CREATE UNLOGGED 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 | dead | keys
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------------+-----------+---------+------+-------------------------------
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1 | (1,65535) | 40 | f | (p)=("(185,185),(1,1)")
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2 | (2,65535) | 40 | f | (p)=("(370,370),(186,186)")
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3 | (3,65535) | 40 | f | (p)=("(555,555),(371,371)")
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4 | (4,65535) | 40 | f | (p)=("(740,740),(556,556)")
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5 | (5,65535) | 40 | f | (p)=("(870,870),(741,741)")
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6 | (6,65535) | 40 | f | (p)=("(1000,1000),(871,871)")
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(6 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 | dead | keys
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------------+-------+---------+------+---------------------
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1 | (0,1) | 40 | f | (p)=("(1,1),(1,1)")
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2 | (0,2) | 40 | f | (p)=("(2,2),(2,2)")
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3 | (0,3) | 40 | f | (p)=("(3,3),(3,3)")
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4 | (0,4) | 40 | f | (p)=("(4,4),(4,4)")
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5 | (0,5) | 40 | f | (p)=("(5,5),(5,5)")
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(5 rows)
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-- gist_page_items_bytea prints the raw key data as a bytea. The output of that is
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-- platform-dependent (endianness), so omit the actual key data from the output.
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SELECT itemoffset, ctid, itemlen FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 0));
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itemoffset | ctid | itemlen
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------------+-----------+---------
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1 | (1,65535) | 40
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2 | (2,65535) | 40
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3 | (3,65535) | 40
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4 | (4,65535) | 40
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5 | (5,65535) | 40
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6 | (6,65535) | 40
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(6 rows)
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-- Suppress the DETAIL message, to allow the tests to work across various
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-- page sizes and architectures.
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\set VERBOSITY terse
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-- Failures with non-GiST index.
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CREATE INDEX test_gist_btree on test_gist(t);
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SELECT gist_page_items(get_raw_page('test_gist_btree', 0), 'test_gist_btree');
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ERROR: "test_gist_btree" is not a GiST index
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SELECT gist_page_items(get_raw_page('test_gist_btree', 0), 'test_gist_idx');
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ERROR: input page is not a valid GiST page
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-- Failure with various modes.
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-- invalid page size
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SELECT gist_page_items_bytea('aaa'::bytea);
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ERROR: invalid page size
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SELECT gist_page_items('aaa'::bytea, 'test_gist_idx'::regclass);
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ERROR: invalid page size
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SELECT gist_page_opaque_info('aaa'::bytea);
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ERROR: invalid page size
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-- invalid special area size
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SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist', 0));
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ERROR: input page is not a valid GiST page
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SELECT gist_page_items_bytea(get_raw_page('test_gist', 0));
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ERROR: input page is not a valid GiST page
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SELECT gist_page_items_bytea(get_raw_page('test_gist_btree', 0));
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ERROR: input page is not a valid GiST page
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\set VERBOSITY default
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-- Tests with all-zero pages.
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SHOW block_size \gset
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SELECT gist_page_items_bytea(decode(repeat('00', :block_size), 'hex'));
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gist_page_items_bytea
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-----------------------
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(0 rows)
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SELECT gist_page_items(decode(repeat('00', :block_size), 'hex'), 'test_gist_idx'::regclass);
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gist_page_items
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-----------------
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(0 rows)
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SELECT gist_page_opaque_info(decode(repeat('00', :block_size), 'hex'));
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gist_page_opaque_info
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-----------------------
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(1 row)
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-- Test gist_page_items with included columns.
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-- Non-leaf pages contain only the key attributes, and leaf pages contain
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-- the included attributes.
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ALTER TABLE test_gist ADD COLUMN i int DEFAULT NULL;
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CREATE INDEX test_gist_idx_inc ON test_gist
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USING gist (p) INCLUDE (t, i);
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-- Mask the value of the key attribute to avoid alignment issues.
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SELECT regexp_replace(keys, '\(p\)=\("(.*?)"\)', '(p)=("<val>")') AS keys_nonleaf_1
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FROM gist_page_items(get_raw_page('test_gist_idx_inc', 0), 'test_gist_idx_inc')
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WHERE itemoffset = 1;
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keys_nonleaf_1
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----------------
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(p)=("<val>")
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(1 row)
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SELECT keys AS keys_leaf_1
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FROM gist_page_items(get_raw_page('test_gist_idx_inc', 1), 'test_gist_idx_inc')
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WHERE itemoffset = 1;
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keys_leaf_1
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------------------------------------------------------
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(p) INCLUDE (t, i)=("(1,1),(1,1)") INCLUDE (1, null)
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(1 row)
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DROP TABLE test_gist;
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