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MWL#67: MRR backport

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- Make index condition pushdown be controlled by an @@optimizer_switch flag,
  not by @@engine_condition_pushdown
- Make MRR buffer size be controlled by @@mrr_buffer_size, not 
  by @@read_rnd_buffer_size
- Move parts of code to separate files
- Code cleanup
- Add --sorted_result to some SELECTs in tests.
This commit is contained in:
Sergey Petrunya 2009-12-22 15:33:21 +03:00
commit da5edf5057
33 changed files with 1664 additions and 1613 deletions
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34
mysql-test/t/myisam_mrr.test
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@ -6,12 +6,12 @@
drop table if exists t1, t2, t3;
--enable_warnings
set @read_rnd_buffer_size_save= @@read_rnd_buffer_size;
set read_rnd_buffer_size=79;
set @mrr_buffer_size_save= @@mrr_buffer_size;
set mrr_buffer_size=79;
-- source include/mrr_tests.inc
set @@read_rnd_buffer_size= @read_rnd_buffer_size_save;
set @@mrr_buffer_size= @mrr_buffer_size_save;
#
# BUG#30622: Incorrect query results for MRR + filesort
@ -96,3 +96,31 @@ insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0
explain select * from t1 where a < 20 order by a;
drop table t0, t1;
-- echo #
-- echo # Part of MWL#67: DS-MRR backport: add an @@optimizer_switch flag for
-- echo # index_condition pushdown:
-- echo # - engine_condition_pushdown does not affect ICP
# Check that optimizer_switch is present
select @@optimizer_switch;
# Check if it affects ICP
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int, key(a));
insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0 A, t0 B, t0 C;
-- echo A query that will use ICP:
explain select * from t1 where a < 20;
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='index_condition_pushdown=off';
explain select * from t1 where a < 20;
set optimizer_switch='index_condition_pushdown=on';
explain select * from t1 where a < 20;
set optimizer_switch=@save_optimizer_switch;
drop table t0, t1;