Bug#30237 (Performance regression in boolean expressions)
This is a performance bug, related to the parsing or 'OR' and 'AND' boolean
expressions.
Let N be the number of expressions involved in a OR (respectively AND).
When N=1
For example, "select 1" involve only 1 term: there is no OR operator.
In 4.0 and 4.1, parsing expressions not involving OR had no overhead.
In 5.0, parsing adds some overhead, with Select->expr_list.
With this patch, the overhead introduced in 5.0 has been removed,
so that performances for N=1 should be identical to the 4.0 performances,
which are optimal (there is no code executed at all)
The overhead in 5.0 was in fact affecting significantly some operations.
For example, loading 1 Million rows into a table with INSERTs,
for a table that has 100 columns, leads to parsing 100 Millions of
expressions, which means that the overhead related to Select->expr_list
is executed 100 Million times ...
Considering that N=1 is by far the most probable expression,
this case should be optimal.
When N=2
For example, "select a OR b" involves 2 terms in the OR operator.
In 4.0 and 4.1, parsing expressions involving 2 terms created 1 Item_cond_or
node, which is the expected result.
In 5.0, parsing these expression also produced 1 node, but with some extra
overhead related to Select->expr_list : creating 1 list in Select->expr_list
and another in Item_cond::list is inefficient.
With this patch, the overhead introduced in 5.0 has been removed
so that performances for N=2 should be identical to the 4.0 performances.
Note that the memory allocation uses the new (thd->mem_root) syntax
directly.
The cost of "is_cond_or" is estimated to be neglectable: the real problem
of the performance degradation comes from unneeded memory allocations.
When N>=3
For example, "select a OR b OR c ...", which involves 3 or more terms.
In 4.0 and 4.1, the parser had no significant cost overhead, but produced
an Item tree which is difficult to evaluate / optimize during runtime.
In 5.0, the parser produces a better Item tree, using the Item_cond
constructor that accepts a list of children directly, but at an extra cost
related to Select->expr_list.
With this patch, the code is implemented to take the best of the two
implementations:
- there is no overhead with Select->expr_list
- the Item tree generated is optimized and flattened.
This is achieved by adding children nodes into the Item tree directly,
with Item_cond::add(), which avoids the need for temporary lists and memory
allocation
Note that this patch also provide an extra optimization, that the previous
code in 5.0 did not provide: expressions are flattened in the Item tree,
based on what the expression already parsed is, and not based on the order
in which rules are reduced.
For example : "(a OR b) OR c", "a OR (b OR c)" would both be represented
with 2 Item_cond_or nodes before this patch, and with 1 node only with this
patch. The logic used is based on the mathematical properties of the OR
operator (it's associative), and produces a simpler tree.
sql/item_cmpfunc.h:
Improved performances for parsing boolean expressions
sql/sql_yacc.yy:
Improved performances for parsing boolean expressions
mysql-test/r/parser_precedence.result:
Added test cases to cover boolean operator precedence
mysql-test/t/parser_precedence.test:
Added test cases to cover boolean operator precedence
2007-08-22 19:05:35 +02:00
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--disable_warnings
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drop table if exists t1_30237_bool;
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--enable_warnings
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create table t1_30237_bool(A boolean, B boolean, C boolean);
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insert into t1_30237_bool values
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(FALSE, FALSE, FALSE),
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(FALSE, FALSE, NULL),
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(FALSE, FALSE, TRUE),
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(FALSE, NULL, FALSE),
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(FALSE, NULL, NULL),
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(FALSE, NULL, TRUE),
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(FALSE, TRUE, FALSE),
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(FALSE, TRUE, NULL),
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(FALSE, TRUE, TRUE),
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(NULL, FALSE, FALSE),
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(NULL, FALSE, NULL),
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(NULL, FALSE, TRUE),
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(NULL, NULL, FALSE),
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(NULL, NULL, NULL),
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(NULL, NULL, TRUE),
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(NULL, TRUE, FALSE),
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(NULL, TRUE, NULL),
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(NULL, TRUE, TRUE),
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(TRUE, FALSE, FALSE),
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(TRUE, FALSE, NULL),
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(TRUE, FALSE, TRUE),
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(TRUE, NULL, FALSE),
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(TRUE, NULL, NULL),
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(TRUE, NULL, TRUE),
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(TRUE, TRUE, FALSE),
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(TRUE, TRUE, NULL),
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(TRUE, TRUE, TRUE) ;
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--echo Testing OR, XOR, AND
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select A, B, A OR B, A XOR B, A AND B
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from t1_30237_bool where C is null order by A, B;
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--echo Testing that OR is associative
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select A, B, C, (A OR B) OR C, A OR (B OR C), A OR B OR C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where ((A OR B) OR C) != (A OR (B OR C));
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--echo Testing that XOR is associative
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select A, B, C, (A XOR B) XOR C, A XOR (B XOR C), A XOR B XOR C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where ((A XOR B) XOR C) != (A XOR (B XOR C));
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--echo Testing that AND is associative
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select A, B, C, (A AND B) AND C, A AND (B AND C), A AND B AND C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where ((A AND B) AND C) != (A AND (B AND C));
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--echo Testing that AND has precedence over OR
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select A, B, C, (A OR B) AND C, A OR (B AND C), A OR B AND C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where (A OR (B AND C)) != (A OR B AND C);
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select A, B, C, (A AND B) OR C, A AND (B OR C), A AND B OR C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where ((A AND B) OR C) != (A AND B OR C);
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--echo Testing that AND has precedence over XOR
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select A, B, C, (A XOR B) AND C, A XOR (B AND C), A XOR B AND C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where (A XOR (B AND C)) != (A XOR B AND C);
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select A, B, C, (A AND B) XOR C, A AND (B XOR C), A AND B XOR C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where ((A AND B) XOR C) != (A AND B XOR C);
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--echo Testing that XOR has precedence over OR
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select A, B, C, (A XOR B) OR C, A XOR (B OR C), A XOR B OR C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where ((A XOR B) OR C) != (A XOR B OR C);
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select A, B, C, (A OR B) XOR C, A OR (B XOR C), A OR B XOR C
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from t1_30237_bool order by A, B, C;
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select count(*) from t1_30237_bool
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where (A OR (B XOR C)) != (A OR B XOR C);
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drop table t1_30237_bool;
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2007-08-28 19:16:03 +02:00
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--echo Testing that NOT has precedence over OR
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select (NOT FALSE) OR TRUE, NOT (FALSE OR TRUE), NOT FALSE OR TRUE;
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--echo Testing that NOT has precedence over XOR
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select (NOT FALSE) XOR FALSE, NOT (FALSE XOR FALSE), NOT FALSE XOR FALSE;
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--echo Testing that NOT has precedence over AND
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select (NOT FALSE) AND FALSE, NOT (FALSE AND FALSE), NOT FALSE AND FALSE;
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--echo Testing that NOT is associative
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select NOT NOT TRUE, NOT NOT NOT FALSE;
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--echo Testing that IS has precedence over NOT
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select (NOT NULL) IS TRUE, NOT (NULL IS TRUE), NOT NULL IS TRUE;
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select (NOT NULL) IS NOT TRUE, NOT (NULL IS NOT TRUE), NOT NULL IS NOT TRUE;
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select (NOT NULL) IS FALSE, NOT (NULL IS FALSE), NOT NULL IS FALSE;
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select (NOT NULL) IS NOT FALSE, NOT (NULL IS NOT FALSE), NOT NULL IS NOT FALSE;
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select (NOT TRUE) IS UNKNOWN, NOT (TRUE IS UNKNOWN), NOT TRUE IS UNKNOWN;
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select (NOT TRUE) IS NOT UNKNOWN, NOT (TRUE IS NOT UNKNOWN), NOT TRUE IS NOT UNKNOWN;
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select (NOT TRUE) IS NULL, NOT (TRUE IS NULL), NOT TRUE IS NULL;
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select (NOT TRUE) IS NOT NULL, NOT (TRUE IS NOT NULL), NOT TRUE IS NOT NULL;
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--echo Testing that IS [NOT] TRUE/FALSE/UNKNOWN predicates are not associative
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# Documenting existing behavior in 5.0.48
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-- error ER_PARSE_ERROR
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select TRUE IS TRUE IS TRUE IS TRUE;
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-- error ER_PARSE_ERROR
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select FALSE IS NOT TRUE IS NOT TRUE IS NOT TRUE;
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-- error ER_PARSE_ERROR
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select NULL IS FALSE IS FALSE IS FALSE;
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-- error ER_PARSE_ERROR
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select TRUE IS NOT FALSE IS NOT FALSE IS NOT FALSE;
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-- error ER_PARSE_ERROR
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select FALSE IS UNKNOWN IS UNKNOWN IS UNKNOWN;
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-- error ER_PARSE_ERROR
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select TRUE IS NOT UNKNOWN IS NOT UNKNOWN IS NOT UNKNOWN;
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--echo Testing that IS [NOT] NULL predicates are associative
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# Documenting existing behavior in 5.0.48
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select FALSE IS NULL IS NULL IS NULL;
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select TRUE IS NOT NULL IS NOT NULL IS NOT NULL;
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--echo Testing that comparison operators are left associative
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select 1 <=> 2 <=> 2, (1 <=> 2) <=> 2, 1 <=> (2 <=> 2);
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select 1 = 2 = 2, (1 = 2) = 2, 1 = (2 = 2);
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select 1 != 2 != 3, (1 != 2) != 3, 1 != (2 != 3);
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select 1 <> 2 <> 3, (1 <> 2) <> 3, 1 <> (2 <> 3);
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select 1 < 2 < 3, (1 < 2) < 3, 1 < (2 < 3);
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select 3 <= 2 <= 1, (3 <= 2) <= 1, 3 <= (2 <= 1);
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select 1 > 2 > 3, (1 > 2) > 3, 1 > (2 > 3);
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select 1 >= 2 >= 3, (1 >= 2) >= 3, 1 >= (2 >= 3);
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-- echo Testing that | is associative
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select 0xF0 | 0x0F | 0x55, (0xF0 | 0x0F) | 0x55, 0xF0 | (0x0F | 0x55);
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-- echo Testing that & is associative
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select 0xF5 & 0x5F & 0x55, (0xF5 & 0x5F) & 0x55, 0xF5 & (0x5F & 0x55);
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-- echo Testing that << is left associative
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select 4 << 3 << 2, (4 << 3) << 2, 4 << (3 << 2);
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-- echo Testing that >> is left associative
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select 256 >> 3 >> 2, (256 >> 3) >> 2, 256 >> (3 >> 2);
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--echo Testing that & has precedence over |
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select 0xF0 & 0x0F | 0x55, (0xF0 & 0x0F) | 0x55, 0xF0 & (0x0F | 0x55);
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select 0x55 | 0xF0 & 0x0F, (0x55 | 0xF0) & 0x0F, 0x55 | (0xF0 & 0x0F);
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--echo Testing that << has precedence over |
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select 0x0F << 4 | 0x0F, (0x0F << 4) | 0x0F, 0x0F << (4 | 0x0F);
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select 0x0F | 0x0F << 4, (0x0F | 0x0F) << 4, 0x0F | (0x0F << 4);
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--echo Testing that >> has precedence over |
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select 0xF0 >> 4 | 0xFF, (0xF0 >> 4) | 0xFF, 0xF0 >> (4 | 0xFF);
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select 0xFF | 0xF0 >> 4, (0xFF | 0xF0) >> 4, 0xFF | (0xF0 >> 4);
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--echo Testing that << has precedence over &
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select 0x0F << 4 & 0xF0, (0x0F << 4) & 0xF0, 0x0F << (4 & 0xF0);
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select 0xF0 & 0x0F << 4, (0xF0 & 0x0F) << 4, 0xF0 & (0x0F << 4);
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--echo Testing that >> has precedence over &
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select 0xF0 >> 4 & 0x55, (0xF0 >> 4) & 0x55, 0xF0 >> (4 & 0x55);
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select 0x0F & 0xF0 >> 4, (0x0F & 0xF0) >> 4, 0x0F & (0xF0 >> 4);
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--echo Testing that >> and << have the same precedence
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select 0xFF >> 4 << 2, (0xFF >> 4) << 2, 0xFF >> (4 << 2);
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select 0x0F << 4 >> 2, (0x0F << 4) >> 2, 0x0F << (4 >> 2);
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--echo Testing that binary + is associative
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select 1 + 2 + 3, (1 + 2) + 3, 1 + (2 + 3);
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--echo Testing that binary - is left associative
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select 1 - 2 - 3, (1 - 2) - 3, 1 - (2 - 3);
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--echo Testing that binary + and binary - have the same precedence
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# evaluated left to right
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select 1 + 2 - 3, (1 + 2) - 3, 1 + (2 - 3);
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select 1 - 2 + 3, (1 - 2) + 3, 1 - (2 + 3);
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--echo Testing that binary + has precedence over |
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select 0xF0 + 0x0F | 0x55, (0xF0 + 0x0F) | 0x55, 0xF0 + (0x0F | 0x55);
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select 0x55 | 0xF0 + 0x0F, (0x55 | 0xF0) + 0x0F, 0x55 | (0xF0 + 0x0F);
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--echo Testing that binary + has precedence over &
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select 0xF0 + 0x0F & 0x55, (0xF0 + 0x0F) & 0x55, 0xF0 + (0x0F & 0x55);
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select 0x55 & 0xF0 + 0x0F, (0x55 & 0xF0) + 0x0F, 0x55 & (0xF0 + 0x0F);
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--echo Testing that binary + has precedence over <<
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select 2 + 3 << 4, (2 + 3) << 4, 2 + (3 << 4);
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select 3 << 4 + 2, (3 << 4) + 2, 3 << (4 + 2);
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--echo Testing that binary + has precedence over >>
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select 4 + 3 >> 2, (4 + 3) >> 2, 4 + (3 >> 2);
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select 3 >> 2 + 1, (3 >> 2) + 1, 3 >> (2 + 1);
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--echo Testing that binary - has precedence over |
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select 0xFF - 0x0F | 0x55, (0xFF - 0x0F) | 0x55, 0xFF - (0x0F | 0x55);
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select 0x55 | 0xFF - 0xF0, (0x55 | 0xFF) - 0xF0, 0x55 | (0xFF - 0xF0);
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--echo Testing that binary - has precedence over &
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select 0xFF - 0xF0 & 0x55, (0xFF - 0xF0) & 0x55, 0xFF - (0xF0 & 0x55);
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select 0x55 & 0xFF - 0xF0, (0x55 & 0xFF) - 0xF0, 0x55 & (0xFF - 0xF0);
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--echo Testing that binary - has precedence over <<
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select 16 - 3 << 2, (16 - 3) << 2, 16 - (3 << 2);
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select 4 << 3 - 2, (4 << 3) - 2, 4 << (3 - 2);
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--echo Testing that binary - has precedence over >>
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select 16 - 3 >> 2, (16 - 3) >> 2, 16 - (3 >> 2);
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select 16 >> 3 - 2, (16 >> 3) - 2, 16 >> (3 - 2);
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--echo Testing that * is associative
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select 2 * 3 * 4, (2 * 3) * 4, 2 * (3 * 4);
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--echo Testing that * has precedence over |
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select 2 * 0x40 | 0x0F, (2 * 0x40) | 0x0F, 2 * (0x40 | 0x0F);
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select 0x0F | 2 * 0x40, (0x0F | 2) * 0x40, 0x0F | (2 * 0x40);
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--echo Testing that * has precedence over &
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select 2 * 0x40 & 0x55, (2 * 0x40) & 0x55, 2 * (0x40 & 0x55);
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select 0xF0 & 2 * 0x40, (0xF0 & 2) * 0x40, 0xF0 & (2 * 0x40);
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--echo Testing that * has precedence over <<
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# Actually, can't prove it for the first case,
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# since << is a multiplication by a power of 2,
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# and * is associative
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select 5 * 3 << 4, (5 * 3) << 4, 5 * (3 << 4);
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select 2 << 3 * 4, (2 << 3) * 4, 2 << (3 * 4);
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--echo Testing that * has precedence over >>
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# >> is a multiplication by a (negative) power of 2,
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# see above.
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select 3 * 4 >> 2, (3 * 4) >> 2, 3 * (4 >> 2);
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select 4 >> 2 * 3, (4 >> 2) * 3, 4 >> (2 * 3);
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--echo Testing that * has precedence over binary +
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select 2 * 3 + 4, (2 * 3) + 4, 2 * (3 + 4);
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select 2 + 3 * 4, (2 + 3) * 4, 2 + (3 * 4);
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--echo Testing that * has precedence over binary -
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select 4 * 3 - 2, (4 * 3) - 2, 4 * (3 - 2);
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select 4 - 3 * 2, (4 - 3) * 2, 4 - (3 * 2);
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--echo Testing that / is left associative
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select 15 / 5 / 3, (15 / 5) / 3, 15 / (5 / 3);
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--echo Testing that / has precedence over |
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select 105 / 5 | 2, (105 / 5) | 2, 105 / (5 | 2);
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select 105 | 2 / 5, (105 | 2) / 5, 105 | (2 / 5);
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--echo Testing that / has precedence over &
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select 105 / 5 & 0x0F, (105 / 5) & 0x0F, 105 / (5 & 0x0F);
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select 0x0F & 105 / 5, (0x0F & 105) / 5, 0x0F & (105 / 5);
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--echo Testing that / has precedence over <<
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select 0x80 / 4 << 2, (0x80 / 4) << 2, 0x80 / (4 << 2);
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select 0x80 << 4 / 2, (0x80 << 4) / 2, 0x80 << (4 / 2);
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--echo Testing that / has precedence over >>
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select 0x80 / 4 >> 2, (0x80 / 4) >> 2, 0x80 / (4 >> 2);
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select 0x80 >> 4 / 2, (0x80 >> 4) / 2, 0x80 >> (4 / 2);
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--echo Testing that / has precedence over binary +
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select 0x80 / 2 + 2, (0x80 / 2) + 2, 0x80 / (2 + 2);
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select 0x80 + 2 / 2, (0x80 + 2) / 2, 0x80 + (2 / 2);
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--echo Testing that / has precedence over binary -
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select 0x80 / 4 - 2, (0x80 / 4) - 2, 0x80 / (4 - 2);
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select 0x80 - 4 / 2, (0x80 - 4) / 2, 0x80 - (4 / 2);
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# TODO: %, DIV, MOD
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--echo Testing that ^ is associative
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select 0xFF ^ 0xF0 ^ 0x0F, (0xFF ^ 0xF0) ^ 0x0F, 0xFF ^ (0xF0 ^ 0x0F);
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select 0xFF ^ 0xF0 ^ 0x55, (0xFF ^ 0xF0) ^ 0x55, 0xFF ^ (0xF0 ^ 0x55);
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--echo Testing that ^ has precedence over |
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select 0xFF ^ 0xF0 | 0x0F, (0xFF ^ 0xF0) | 0x0F, 0xFF ^ (0xF0 | 0x0F);
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select 0xF0 | 0xFF ^ 0xF0, (0xF0 | 0xFF) ^ 0xF0, 0xF0 | (0xFF ^ 0xF0);
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--echo Testing that ^ has precedence over &
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select 0xFF ^ 0xF0 & 0x0F, (0xFF ^ 0xF0) & 0x0F, 0xFF ^ (0xF0 & 0x0F);
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select 0x0F & 0xFF ^ 0xF0, (0x0F & 0xFF) ^ 0xF0, 0x0F & (0xFF ^ 0xF0);
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--echo Testing that ^ has precedence over <<
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select 0xFF ^ 0xF0 << 2, (0xFF ^ 0xF0) << 2, 0xFF ^ (0xF0 << 2);
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select 0x0F << 2 ^ 0xFF, (0x0F << 2) ^ 0xFF, 0x0F << (2 ^ 0xFF);
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--echo Testing that ^ has precedence over >>
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select 0xFF ^ 0xF0 >> 2, (0xFF ^ 0xF0) >> 2, 0xFF ^ (0xF0 >> 2);
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select 0xFF >> 2 ^ 0xF0, (0xFF >> 2) ^ 0xF0, 0xFF >> (2 ^ 0xF0);
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--echo Testing that ^ has precedence over binary +
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select 0xFF ^ 0xF0 + 0x0F, (0xFF ^ 0xF0) + 0x0F, 0xFF ^ (0xF0 + 0x0F);
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select 0x0F + 0xFF ^ 0xF0, (0x0F + 0xFF) ^ 0xF0, 0x0F + (0xFF ^ 0xF0);
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--echo Testing that ^ has precedence over binary -
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select 0xFF ^ 0xF0 - 1, (0xFF ^ 0xF0) - 1, 0xFF ^ (0xF0 - 1);
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select 0x55 - 0x0F ^ 0x55, (0x55 - 0x0F) ^ 0x55, 0x55 - (0x0F ^ 0x55);
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--echo Testing that ^ has precedence over *
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select 0xFF ^ 0xF0 * 2, (0xFF ^ 0xF0) * 2, 0xFF ^ (0xF0 * 2);
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select 2 * 0xFF ^ 0xF0, (2 * 0xFF) ^ 0xF0, 2 * (0xFF ^ 0xF0);
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--echo Testing that ^ has precedence over /
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select 0xFF ^ 0xF0 / 2, (0xFF ^ 0xF0) / 2, 0xFF ^ (0xF0 / 2);
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select 0xF2 / 2 ^ 0xF0, (0xF2 / 2) ^ 0xF0, 0xF2 / (2 ^ 0xF0);
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--echo Testing that ^ has precedence over %
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select 0xFF ^ 0xF0 % 0x20, (0xFF ^ 0xF0) % 0x20, 0xFF ^ (0xF0 % 0x20);
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select 0xFF % 0x20 ^ 0xF0, (0xFF % 0x20) ^ 0xF0, 0xFF % (0x20 ^ 0xF0);
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--echo Testing that ^ has precedence over DIV
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select 0xFF ^ 0xF0 DIV 2, (0xFF ^ 0xF0) DIV 2, 0xFF ^ (0xF0 DIV 2);
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select 0xF2 DIV 2 ^ 0xF0, (0xF2 DIV 2) ^ 0xF0, 0xF2 DIV (2 ^ 0xF0);
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--echo Testing that ^ has precedence over MOD
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select 0xFF ^ 0xF0 MOD 0x20, (0xFF ^ 0xF0) MOD 0x20, 0xFF ^ (0xF0 MOD 0x20);
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select 0xFF MOD 0x20 ^ 0xF0, (0xFF MOD 0x20) ^ 0xF0, 0xFF MOD (0x20 ^ 0xF0);
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