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Add support for INDEX hints in SELECT statement #216

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Merged
devenbansod merged 1 commit into from
Dec 23, 2018
Merged

Add support for INDEX hints in SELECT statement #216

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193 changes: 193 additions & 0 deletions src/Components/IndexHint.php
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Original file line number Diff line number Diff line change
@@ -0,0 +1,193 @@
<?php

/**
* Parses an Index hint.
*/

namespace PhpMyAdmin\SqlParser\Components;

use PhpMyAdmin\SqlParser\Component;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;

/**
* Parses an Index hint.
*
* @category Components
*
* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
*/
class IndexHint extends Component
{
/**
* The type of hint (USE/FORCE/IGNORE)
*
* @var string
*/
public $type;

/**
* What the hint is for (INDEX/KEY)
*
* @var string
*/
public $indexOrKey;

/**
* The clause for which this hint is (JOIN/ORDER BY/GROUP BY)
*
* @var string
*/
public $for;

/**
* List of indexes in this hint
*
* @var array
*/
public $indexes = array();

/**
* Constructor.
*
* @param string $type the type of hint (USE/FORCE/IGNORE)
* @param string $indexOrKey What the hint is for (INDEX/KEY)
* @param string $for the clause for which this hint is (JOIN/ORDER BY/GROUP BY)
* @param string $indexes List of indexes in this hint
*/
public function __construct(string $type = null, string $indexOrKey = null, string $for = null, array $indexes = array())
{
$this->type = $type;
$this->indexOrKey = $indexOrKey;
$this->for = $for;
$this->indexes = $indexes;
}

/**
* @param Parser $parser the parser that serves as context
* @param TokensList $list the list of tokens that are being parsed
* @param array $options parameters for parsing
*
* @return IndexHint|Component[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = new self();
$expr->type = isset($options['type']) ? $options['type'] : null;
/**
* The state of the parser.
*
* Below are the states of the parser.
* 0 ----------------- [ USE/IGNORE/FORCE ]-----------------> 1
* 1 -------------------- [ INDEX/KEY ] --------------------> 2
* 2 ----------------------- [ FOR ] -----------------------> 3
* 2 -------------------- [ expr_list ] --------------------> 0
* 3 -------------- [ JOIN/GROUP BY/ORDER BY ] -------------> 4
* 4 -------------------- [ expr_list ] --------------------> 0
* @var int
*/
$state = 0;

// By design, the parser will parse first token after the keyword. So, the keyword
// must be analyzed too, in order to determine the type of this index hint.
if ($list->idx > 0) {
--$list->idx;
}
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*
* @var Token
*/
$token = $list->tokens[$list->idx];

// End of statement.
if ($token->type === Token::TYPE_DELIMITER) {
break;
}
// Skipping whitespaces and comments.
if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}

switch ($state) {
case 0:
if ($token->type === Token::TYPE_KEYWORD) {
if ($token->keyword === 'USE' || $token->keyword === 'IGNORE' || $token->keyword === 'FORCE') {
$expr->type = $token->keyword;
$state = 1;
} else {
break 2;
}
}
break;
case 1:
if ($token->type === Token::TYPE_KEYWORD) {
if ($token->keyword === 'INDEX' || $token->keyword === 'KEY') {
$expr->indexOrKey = $token->keyword;
} else {
$parser->error('Unexpected keyword.', $token);
}
$state = 2;
} else {
// we expect the token to be a keyword
$parser->error('Unexpected token.', $token);
}
break;
case 2:
if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'FOR') {
$state = 3;
} else {
$expr->indexes = ExpressionArray::parse($parser, $list);
$state = 0;
$ret[] = $expr;
$expr = new self();
}
break;
case 3:
if ($token->type === Token::TYPE_KEYWORD) {
if ($token->keyword === 'JOIN' || $token->keyword === 'GROUP BY' || $token->keyword === 'ORDER BY') {
$expr->for = $token->keyword;
} else {
$parser->error('Unexpected keyword.', $token);
}
$state = 4;
} else {
// we expect the token to be a keyword
$parser->error('Unexpected token.', $token);
}
break;
case 4:
$expr->indexes = ExpressionArray::parse($parser, $list);
$state = 0;
$ret[] = $expr;
$expr = new self();
break;
}
}
--$list->idx;

return $ret;
}

/**
* @param ArrayObj|ArrayObj[] $component the component to be built
* @param array $options parameters for building
*
* @return string
*/
public static function build($component, array $options = array())
{
if (is_array($component)) {
return implode(' ', $component);
}

$ret = $component->type . ' ' . $component->indexOrKey . ' ';
if ($component->for !== null) {
$ret .= 'FOR ' . $component->for . ' ';
}
return $ret . ExpressionArray::build($component->indexes);
}
}
12 changes: 12 additions & 0 deletions src/Parser.php
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Expand Up @@ -177,6 +177,10 @@ class Parser extends Core
'field' => 'fields',
'options' => array('parseField' => 'table'),
),
'FORCE' => array(
'class' => 'PhpMyAdmin\\SqlParser\\Components\\IndexHint',
'field' => 'index_hints',
),
'FROM' => array(
'class' => 'PhpMyAdmin\\SqlParser\\Components\\ExpressionArray',
'field' => 'from',
Expand All @@ -190,6 +194,10 @@ class Parser extends Core
'class' => 'PhpMyAdmin\\SqlParser\\Components\\Condition',
'field' => 'having',
),
'IGNORE' => array(
'class' => 'PhpMyAdmin\\SqlParser\\Components\\IndexHint',
'field' => 'index_hints',
),
'INTO' => array(
'class' => 'PhpMyAdmin\\SqlParser\\Components\\IntoKeyword',
'field' => 'into',
Expand Down Expand Up @@ -308,6 +316,10 @@ class Parser extends Core
'field' => 'tables',
'options' => array('parseField' => 'table'),
),
'USE' => array(
'class' => 'PhpMyAdmin\\SqlParser\\Components\\IndexHint',
'field' => 'index_hints',
),
'VALUE' => array(
'class' => 'PhpMyAdmin\\SqlParser\\Components\\Array2d',
'field' => 'values',
Expand Down
11 changes: 11 additions & 0 deletions src/Statement.php
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Expand Up @@ -497,6 +497,17 @@ public function validateClauseOrder($parser, $list)
$clauseType
);

if ($clauseStartIdx !== -1
&& $this instanceof Statements\SelectStatement
&& ($clauseType === 'FORCE'
|| $clauseType === 'IGNORE'
|| $clauseType === 'USE')
) {
// TODO: ordering of clauses in a SELECT statement with
// Index hints is not supported
return true;
}

// Handle ordering of Multiple Joins in a query
if ($clauseStartIdx !== -1) {
if ($minJoin === 0 && stripos($clauseType, 'JOIN')) {
Expand Down
10 changes: 10 additions & 0 deletions src/Statements/SelectStatement.php
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Original file line number Diff line number Diff line change
Expand Up @@ -91,6 +91,9 @@ class SelectStatement extends Statement
'_SELECT' => array('SELECT', 1),
'INTO' => array('INTO', 3),
'FROM' => array('FROM', 3),
'FORCE' => array('FORCE', 1),
'USE' => array('USE', 1),
'IGNORE' => array('IGNORE', 3),
'PARTITION' => array('PARTITION', 3),

'JOIN' => array('JOIN', 1),
Expand Down Expand Up @@ -135,6 +138,13 @@ class SelectStatement extends Statement
*/
public $from = array();

/**
* Index hints
*
* @var IndexHint[]
*/
public $index_hints;

/**
* Partitions used as source for this statement.
*
Expand Down
12 changes: 12 additions & 0 deletions tests/Builder/SelectStatementTest.php
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Expand Up @@ -102,4 +102,16 @@ public function testBuildGroupBy()
$stmt->build()
);
}

public function testBuildIndexHint()
{
$query = 'SELECT * FROM address FORCE INDEX (idx_fk_city_id) IGNORE KEY FOR GROUP BY (a, b,c) WHERE city_id<0 ';
$parser = new Parser($query);
$stmt = $parser->statements[0];

$this->assertEquals(
$query,
$stmt->build()
);
}
}
6 changes: 6 additions & 0 deletions tests/Parser/SelectStatementTest.php
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Expand Up @@ -69,6 +69,12 @@ public function testSelectProvider()
array('parser/parseSelectEndOptionsErr'),
array('parser/parseSelectUnion'),
array('parser/parseSelectUnion2'),
array('parser/parseSelectIndexHint1'),
array('parser/parseSelectIndexHint2'),
array('parser/parseSelectIndexHintErr1'),
array('parser/parseSelectIndexHintErr2'),
array('parser/parseSelectIndexHintErr3'),
array('parser/parseSelectIndexHintErr4'),
);
}
}
1 change: 1 addition & 0 deletions tests/data/parser/parseSelectIndexHint1.in
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SELECT * FROM address FORCE INDEX (idx_fk_city_id) IGNORE KEY FOR GROUP BY (a, b,c) WHERE city_id<0;
1 change: 1 addition & 0 deletions tests/data/parser/parseSelectIndexHint1.out
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1 change: 1 addition & 0 deletions tests/data/parser/parseSelectIndexHint2.in
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SELECT * FROM address USE INDEX (idx_fk_city_id) FORCE KEY FOR GROUP BY (a, b,c) WHERE city_id<0
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