167 lines
5.6 KiB
Plaintext
167 lines
5.6 KiB
Plaintext
--
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-- Test GIN indexes.
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--
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-- There are other tests to test different GIN opclasses. This is for testing
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-- GIN itself.
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-- Create and populate a test table with a GIN index.
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create table gin_test_tbl(i int4[]) with (autovacuum_enabled = off);
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create index gin_test_idx on gin_test_tbl using gin (i)
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with (fastupdate = on, gin_pending_list_limit = 4096);
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insert into gin_test_tbl select array[1, 2, g] from generate_series(1, 20000) g;
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insert into gin_test_tbl select array[1, 3, g] from generate_series(1, 1000) g;
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select gin_clean_pending_list('gin_test_idx')>10 as many; -- flush the fastupdate buffers
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many
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------
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t
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(1 row)
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insert into gin_test_tbl select array[3, 1, g] from generate_series(1, 1000) g;
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vacuum gin_test_tbl; -- flush the fastupdate buffers
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select gin_clean_pending_list('gin_test_idx'); -- nothing to flush
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gin_clean_pending_list
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------------------------
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0
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(1 row)
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-- Test vacuuming
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delete from gin_test_tbl where i @> array[2];
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vacuum gin_test_tbl;
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-- Disable fastupdate, and do more insertions. With fastupdate enabled, most
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-- insertions (by flushing the list pages) cause page splits. Without
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-- fastupdate, we get more churn in the GIN data leaf pages, and exercise the
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-- recompression codepaths.
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alter index gin_test_idx set (fastupdate = off);
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insert into gin_test_tbl select array[1, 2, g] from generate_series(1, 1000) g;
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insert into gin_test_tbl select array[1, 3, g] from generate_series(1, 1000) g;
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delete from gin_test_tbl where i @> array[2];
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vacuum gin_test_tbl;
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-- Test optimization of empty queries
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create temp table t_gin_test_tbl(i int4[], j int4[]);
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create index on t_gin_test_tbl using gin (i, j);
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insert into t_gin_test_tbl
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values
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(null, null),
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('{}', null),
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('{1}', null),
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('{1,2}', null),
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(null, '{}'),
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(null, '{10}'),
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('{1,2}', '{10}'),
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('{2}', '{10}'),
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('{1,3}', '{}'),
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('{1,1}', '{10}');
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set enable_seqscan = off;
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explain (costs off)
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select * from t_gin_test_tbl where array[0] <@ i;
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QUERY PLAN
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---------------------------------------------------
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Bitmap Heap Scan on t_gin_test_tbl
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Recheck Cond: ('{0}'::integer[] <@ i)
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-> Bitmap Index Scan on t_gin_test_tbl_i_j_idx
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Index Cond: (i @> '{0}'::integer[])
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(4 rows)
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select * from t_gin_test_tbl where array[0] <@ i;
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i | j
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---+---
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(0 rows)
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select * from t_gin_test_tbl where array[0] <@ i and '{}'::int4[] <@ j;
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i | j
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---+---
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(0 rows)
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explain (costs off)
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select * from t_gin_test_tbl where i @> '{}';
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QUERY PLAN
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---------------------------------------------------
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Bitmap Heap Scan on t_gin_test_tbl
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Recheck Cond: (i @> '{}'::integer[])
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-> Bitmap Index Scan on t_gin_test_tbl_i_j_idx
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Index Cond: (i @> '{}'::integer[])
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(4 rows)
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select * from t_gin_test_tbl where i @> '{}';
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i | j
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-------+------
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{} |
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{1} |
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{1,2} |
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{1,2} | {10}
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{2} | {10}
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{1,3} | {}
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{1,1} | {10}
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(7 rows)
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create function explain_query_json(query_sql text)
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returns table (explain_line json)
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language plpgsql as
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$$
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begin
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set enable_seqscan = off;
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set enable_bitmapscan = on;
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return query execute 'EXPLAIN (ANALYZE, FORMAT json) ' || query_sql;
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end;
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$$;
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create function execute_text_query_index(query_sql text)
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returns setof text
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language plpgsql
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as
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$$
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begin
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set enable_seqscan = off;
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set enable_bitmapscan = on;
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return query execute query_sql;
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end;
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$$;
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create function execute_text_query_heap(query_sql text)
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returns setof text
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language plpgsql
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as
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$$
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begin
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set enable_seqscan = on;
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set enable_bitmapscan = off;
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return query execute query_sql;
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end;
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$$;
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-- check number of rows returned by index and removed by recheck
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select
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query,
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js->0->'Plan'->'Plans'->0->'Actual Rows' as "return by index",
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js->0->'Plan'->'Rows Removed by Index Recheck' as "removed by recheck",
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(res_index = res_heap) as "match"
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from
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(values
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($$ i @> '{}' $$),
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($$ j @> '{}' $$),
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($$ i @> '{}' and j @> '{}' $$),
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($$ i @> '{1}' $$),
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($$ i @> '{1}' and j @> '{}' $$),
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($$ i @> '{1}' and i @> '{}' and j @> '{}' $$),
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($$ j @> '{10}' $$),
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($$ j @> '{10}' and i @> '{}' $$),
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($$ j @> '{10}' and j @> '{}' and i @> '{}' $$),
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($$ i @> '{1}' and j @> '{10}' $$)
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) q(query),
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lateral explain_query_json($$select * from t_gin_test_tbl where $$ || query) js,
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lateral execute_text_query_index($$select string_agg((i, j)::text, ' ') from t_gin_test_tbl where $$ || query) res_index,
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lateral execute_text_query_heap($$select string_agg((i, j)::text, ' ') from t_gin_test_tbl where $$ || query) res_heap;
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query | return by index | removed by recheck | match
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-------------------------------------------+-----------------+--------------------+-------
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i @> '{}' | 7 | 0 | t
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j @> '{}' | 6 | 0 | t
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i @> '{}' and j @> '{}' | 4 | 0 | t
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i @> '{1}' | 5 | 0 | t
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i @> '{1}' and j @> '{}' | 3 | 0 | t
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i @> '{1}' and i @> '{}' and j @> '{}' | 3 | 0 | t
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j @> '{10}' | 4 | 0 | t
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j @> '{10}' and i @> '{}' | 3 | 0 | t
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j @> '{10}' and j @> '{}' and i @> '{}' | 3 | 0 | t
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i @> '{1}' and j @> '{10}' | 2 | 0 | t
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(10 rows)
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reset enable_seqscan;
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reset enable_bitmapscan;
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drop table t_gin_test_tbl;
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