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Item::print(): remove redundant parentheses

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by introducing new Item::precedence() method and using it
to decide whether parentheses are required
This commit is contained in:
Sergei Golubchik
2016-11-27 19:50:10 +01:00
parent 1db438c833
commit 180065ebb0
188 changed files with 2684 additions and 2553 deletions
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4
mysql-test/r/func_misc.result
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@ -354,7 +354,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY tv ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY tv system NULL NULL NULL NULL 1 100.00
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` left join (`test`.`tv`) on((`test`.`tv`.`e` = `test`.`t1`.`a`)) where (not(<expr_cache><last_value(NULL,`test`.`tv`.`e`)>(<in_optimizer>(last_value(NULL,`test`.`tv`.`e`),<exists>(select last_value(NULL,'1') from dual where trigcond((<cache>(last_value(NULL,`test`.`tv`.`e`)) = last_value(NULL,'1'))))))))
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` left join (`test`.`tv`) on(`test`.`tv`.`e` = `test`.`t1`.`a`) where !<expr_cache><last_value(NULL,`test`.`tv`.`e`)>(<in_optimizer>(last_value(NULL,`test`.`tv`.`e`),<exists>(select last_value(NULL,'1') from dual where trigcond(<cache>(last_value(NULL,`test`.`tv`.`e`)) = last_value(NULL,'1')))))
explain extended
select a from t1 left join v_merge on (a=e) where e not in (select last_value(NULL,e) from vm);
id select_type table type possible_keys key key_len ref rows filtered Extra
@ -362,7 +362,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY tv ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY tv system NULL NULL NULL NULL 1 100.00
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` left join (`test`.`tv`) on((`test`.`tv`.`e` = `test`.`t1`.`a`)) where (not(<expr_cache><`test`.`tv`.`e`>(<in_optimizer>(`test`.`tv`.`e`,<exists>(select last_value(NULL,'1') from dual where trigcond((<cache>(`test`.`tv`.`e`) = last_value(NULL,'1'))))))))
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` left join (`test`.`tv`) on(`test`.`tv`.`e` = `test`.`t1`.`a`) where !<expr_cache><`test`.`tv`.`e`>(<in_optimizer>(`test`.`tv`.`e`,<exists>(select last_value(NULL,'1') from dual where trigcond(<cache>(`test`.`tv`.`e`) = last_value(NULL,'1')))))
set optimizer_switch=@optimizer_switch_save;
drop view v_merge, vm;
drop table t1,tv;