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- "ANALYZE $stmt" should discard select's output, but it should still
evaluate the output columns (otherwise, subqueries in select list
are not executed)
- SHOW EXPLAIN's code practice of calling JOIN::save_explain_data()
after JOIN::exec() is disastrous for ANALYZE, because it resets
all counters after the first execution. It is stopped
= "Late" test_if_skip_sort_order() calls explicitly update their part
of the query plan.
= Also, I had to rewrite I_S optimization to actually have optimization
and execution stages.
62 lines
1.7 KiB
Text
62 lines
1.7 KiB
Text
#
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# Tests for "ANALYZE $statement" feature (PostgreSQL's analog is called EXPLAIN ANALYZE)
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#
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--disable_warnings
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drop table if exists t0,t1,t2,t3;
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--enable_warnings
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create table t0 (a int) engine=myisam;
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INSERT INTO t0 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int) engine=myisam;
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INSERT INTO t1 select * from t0;
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--echo # Try a few basic selects to see that r_rows and r_filtered columns work
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analyze select * from t1;
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analyze select * from t1 where a<5;
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analyze select * from t1 where a>100;
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--echo # ANALYZE DELETE will delete rows:
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analyze delete from t1 where a in (2,3,4);
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select * from t1;
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drop table t1;
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--echo # ANALYZE UPDATE will make updates:
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create table t1(a int, b int);
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insert into t1 select a,a from t0;
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analyze update t1 set b=100+b where a in (6,7,8);
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select * from t1;
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drop table t1;
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--echo # Check that UNION works
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create table t1(a int, b int);
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insert into t1 select a,a from t0;
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analyze (select * from t1 A where a<5) union (select * from t1 B where a in (5,6));
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analyze (select * from t1 A where a<5) union (select * from t1 B where a in (1,2));
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drop table t1;
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drop table t0;
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--echo #
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--echo # Try a subquery.
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--echo #
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create table t0 (a int, b int);
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insert into t0 values
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(0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
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create table t1 (a int, b int);
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insert into t1 values (1,1),(2,2),(3,3);
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#
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# t1 t0
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# a=1 (0,1) 2 rows
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# a=2 (0,1,2) 3 rows
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# a=3 (0,1,2,3) 4 rows
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#
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# TOTAL TOTAL= 9 rows. 3 executions, avg=3 rows.
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# WHERE is satisfied for 1 row per query, which gives filtered=33.3
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--echo # See .test file for the right values of r_rows and r_filtered.
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analyze select a, a in (select t0.b from t0 where t0.b+1=t1.b+1) from t1;
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drop table t0,t1;
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