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23d03a1b1e
use Item->neg to convert generate negative Item_num's
instead of Item_func_neg(Item_num).
Based on the following commit:
Author: Monty <monty@mariadb.org>
Date: Mon May 30 22:44:00 2016 +0300
Make negative number their own token
The negation (-) operator will call Item->neg() one underlying numeric constants
and remove itself (like the NOT() function does today for other NOT functions.
This simplifies things
- -1 is not anymore an expression but a basic_const_item
- improves optimizer
- DEFAULT -1 doesn't need special handling anymore
- When we add DEFAULT expressions, -1 will be treated exactly like 1
- printing of items doesn't anymore put braces around all negative numbers
Other things fixed:
- Fixed that longlong converted to decimal's has a more appropriate size
- Fixed that "-0.0" read into a decimal is interpreted as 0.0
51 lines
2 KiB
Text
51 lines
2 KiB
Text
select 1+1,1-1,1+1*2,8/5,8%5,mod(8,5),mod(8,5)|0,-(1+1)*-2;
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1+1 1-1 1+1*2 8/5 8%5 mod(8,5) mod(8,5)|0 -(1+1)*-2
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2 0 3 1.6000 3 3 3 4
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explain extended select 1+1,1-1,1+1*2,8/5,8%5,mod(8,5),mod(8,5)|0,-(1+1)*-2;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select (1 + 1) AS `1+1`,(1 - 1) AS `1-1`,(1 + (1 * 2)) AS `1+1*2`,(8 / 5) AS `8/5`,(8 % 5) AS `8%5`,(8 % 5) AS `mod(8,5)`,((8 % 5) | 0) AS `mod(8,5)|0`,(-((1 + 1)) * -2) AS `-(1+1)*-2`
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select 1 | (1+1),5 & 3,bit_count(7) ;
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1 | (1+1) 5 & 3 bit_count(7)
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3 1 3
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explain extended select 1 | (1+1),5 & 3,bit_count(7) ;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
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Warnings:
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Note 1003 select (1 | (1 + 1)) AS `1 | (1+1)`,(5 & 3) AS `5 & 3`,bit_count(7) AS `bit_count(7)`
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select 1 << 32,1 << 63, 1 << 64, 4 >> 2, 4 >> 63, 1<< 63 >> 60;
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1 << 32 1 << 63 1 << 64 4 >> 2 4 >> 63 1<< 63 >> 60
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4294967296 9223372036854775808 0 1 0 8
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select -1 | 0, -1 ^ 0, -1 & 0;
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-1 | 0 -1 ^ 0 -1 & 0
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18446744073709551615 18446744073709551615 0
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select -1 | 1, -1 ^ 1, -1 & 1;
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-1 | 1 -1 ^ 1 -1 & 1
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18446744073709551615 18446744073709551614 1
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select 1 | -1, 1 ^ -1, 1 & -1;
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1 | -1 1 ^ -1 1 & -1
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18446744073709551615 18446744073709551614 1
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select 0 | -1, 0 ^ -1, 0 & -1;
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0 | -1 0 ^ -1 0 & -1
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18446744073709551615 18446744073709551615 0
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select -1 >> 0, -1 << 0;
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-1 >> 0 -1 << 0
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18446744073709551615 18446744073709551615
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select -1 >> 1, -1 << 1;
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-1 >> 1 -1 << 1
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9223372036854775807 18446744073709551614
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drop table if exists t1,t2;
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create table t1(a int);
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create table t2(a int, b int);
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insert into t1 values (1), (2), (3);
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insert into t2 values (1, 7), (3, 7);
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SET @save_optimizer_switch=@@optimizer_switch;
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SET optimizer_switch='outer_join_with_cache=off';
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select t1.a, t2.a, t2.b, bit_count(t2.b) from t1 left join t2 on t1.a=t2.a;
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a a b bit_count(t2.b)
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1 1 7 3
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2 NULL NULL NULL
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3 3 7 3
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SET optimizer_switch=@save_optimizer_switch;
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drop table t1, t2;
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