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Added 'records_out' and join_type to POSITION

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records_out is the numbers of rows expected to be accepted from a table.
records_read is in contrast the number of rows that the optimizer excepts
to read from the engine.

This patch causes not plan changes. The differences in test results comes
from renaming "records" to "records_read" and printing of record_out in
the optimizer trace.

Other things:
- Renamed table_cond_selectivity() to table_after_join_selectivity()
  to make the purpose of the function more clear.
This commit is contained in:
Monty
2022-04-11 17:59:36 +03:00
committed by Sergei Petrunia
parent 9db877c9ec
commit 2387ee9b45
13 changed files with 1192 additions and 198 deletions
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34
mysql-test/main/opt_trace.test
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@@ -928,3 +928,37 @@ set optimizer_trace='enabled=off';
--echo # End of 10.6 tests
--echo #
--echo # Testing of records_out
--echo #
set @save_optimizer_switch= @@optimizer_switch;
set @save_use_stat_tables= @@use_stat_tables;
set @save_histogram_size= @@histogram_size;
set @save_optimizer_use_condition_selectivity= @@optimizer_use_condition_selectivity;
set optimizer_switch='rowid_filter=on';
set use_stat_tables='preferably';
set optimizer_use_condition_selectivity=4;
set histogram_size=127;
create table t1 (a int, b int, c int, key(a),key(b));
insert into t1 select seq, seq*2, seq/10 from seq_1_to_1000;
analyze table t1;
--optimizer_trace
explain select * from t1 where a<10 and b between 10 and 50 and c < 10;
drop table t1;
create table three (a int);
insert into three values (1),(2),(3);
create table t1 (a int, b int, c int, key(a),key(b));
insert into t1 select mod(seq,10), seq, seq from seq_1_to_10000;
analyze table t1;
--optimizer_trace
explain format=json select * from three, t1 where t1.a=three.a and t1.b<5000 and t1.c<1000;
drop table three, t1;
set @@optimizer_switch= @save_optimizer_switch;
set @@use_stat_tables= @save_use_stat_tables;
set @@histogram_size= @save_histogram_size;
set @@optimizer_use_condition_selectivity= @save_optimizer_use_condition_selectivity;