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Add support for INDEX hints in SELECT statement
Signed-off-by: Deven Bansod <[email protected]>
1 parent 09faf92 commit f054eff

18 files changed

+277
-0
lines changed

‎src/Components/IndexHint.php‎

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Original file line numberDiff line numberDiff line change
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<?php
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/**
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* Parses an Index hint.
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*/
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namespace PhpMyAdmin\SqlParser\Components;
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use PhpMyAdmin\SqlParser\Component;
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use PhpMyAdmin\SqlParser\Parser;
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use PhpMyAdmin\SqlParser\Token;
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use PhpMyAdmin\SqlParser\TokensList;
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/**
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* Parses an Index hint.
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*
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* @category Components
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*
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* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
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*/
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class IndexHint extends Component
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{
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/**
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* The type of hint (USE/FORCE/IGNORE)
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*
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* @var string
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*/
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public $type;
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/**
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* What the hint is for (INDEX/KEY)
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*
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* @var string
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*/
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public $indexOrKey;
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/**
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* The clause for which this hint is (JOIN/ORDER BY/GROUP BY)
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*
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* @var string
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*/
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public $for;
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/**
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* List of indexes in this hint
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*
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* @var array
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*/
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public $indexes = array();
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/**
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* Constructor.
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*
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* @param string $type the type of hint (USE/FORCE/IGNORE)
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* @param string $indexOrKey What the hint is for (INDEX/KEY)
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* @param string $for the clause for which this hint is (JOIN/ORDER BY/GROUP BY)
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* @param string $indexes List of indexes in this hint
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*/
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public function __construct(string $type = null, string $indexOrKey = null, string $for = null, array $indexes = array())
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{
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$this->type = $type;
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$this->indexOrKey = $indexOrKey;
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$this->for = $for;
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$this->indexes = $indexes;
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}
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/**
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* @param Parser $parser the parser that serves as context
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* @param TokensList $list the list of tokens that are being parsed
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* @param array $options parameters for parsing
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*
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* @return IndexHint|Component[]
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*/
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public static function parse(Parser $parser, TokensList $list, array $options = array())
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{
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$ret = array();
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$expr = new self();
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$expr->type = isset($options['type']) ? $options['type'] : null;
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/**
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* The state of the parser.
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*
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* Below are the states of the parser.
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*
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* 0 ----------------- [ USE/IGNORE/FORCE ]-----------------> 1
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* 1 -------------------- [ INDEX/KEY ] --------------------> 2
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* 2 ----------------------- [ FOR ] -----------------------> 3
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* 2 -------------------- [ expr_list ] --------------------> 0
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* 3 -------------- [ JOIN/GROUP BY/ORDER BY ] -------------> 4
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* 4 -------------------- [ expr_list ] --------------------> 0
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*
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* @var int
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*/
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$state = 0;
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// By design, the parser will parse first token after the keyword.
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// In this case, the keyword must be analyzed too, in order to determine
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// the type of this hint.
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if ($list->idx > 0) {
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--$list->idx;
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}
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for (; $list->idx < $list->count; ++$list->idx) {
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/**
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* Token parsed at this moment.
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*
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* @var Token
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*/
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$token = $list->tokens[$list->idx];
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// End of statement.
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if ($token->type === Token::TYPE_DELIMITER) {
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break;
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}
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// Skipping whitespaces and comments.
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if (($token->type === Token::TYPE_WHITESPACE)
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|| ($token->type === Token::TYPE_COMMENT)
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) {
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continue;
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}
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switch ($state) {
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case 0:
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if ($token->type === Token::TYPE_KEYWORD) {
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switch ($token->keyword) {
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case 'USE':
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case 'IGNORE':
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case 'FORCE':
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$expr->type = $token->keyword;
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break;
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default:
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break 3;
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}
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$state = 1;
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}
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break;
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case 1:
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if ($token->type === Token::TYPE_KEYWORD) {
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switch ($token->keyword) {
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case 'INDEX':
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case 'KEY':
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$expr->indexOrKey = $token->keyword;
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break;
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default:
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$parser->error('Unexpected keyword.', $token);
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break;
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}
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$state = 2;
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} else {
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// we expect the token to be a keyword
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$parser->error('Unexpected token.', $token);
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}
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break;
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case 2:
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if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'FOR') {
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$state = 3;
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} else {
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$expr->indexes = ExpressionArray::parse($parser, $list);
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$state = 0;
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$ret[] = $expr;
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$expr = new self();
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}
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break;
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case 3:
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if ($token->type === Token::TYPE_KEYWORD) {
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switch ($token->keyword) {
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case 'JOIN':
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case 'GROUP BY':
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case 'ORDER BY':
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$expr->for = $token->keyword;
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break;
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default:
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$parser->error('Unexpected keyword.', $token);
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break;
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}
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$state = 4;
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} else {
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// we expect the token to be a keyword
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$parser->error('Unexpected token.', $token);
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}
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break;
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case 4:
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$expr->indexes = ExpressionArray::parse($parser, $list);
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$state = 0;
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$ret[] = $expr;
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$expr = new self();
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break;
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}
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}
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--$list->idx;
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return $ret;
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}
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/**
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* @param ArrayObj|ArrayObj[] $component the component to be built
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* @param array $options parameters for building
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*
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* @return string
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*/
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public static function build($component, array $options = array())
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{
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if (is_array($component)) {
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return implode(' ', $component);
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}
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$ret = $component->type . ' ' . $component->indexOrKey . ' ';
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if ($component->for !== null) {
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$ret .= 'FOR ' . $component->for . ' ';
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}
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return $ret . ExpressionArray::build($component->indexes);
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}
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}

‎src/Parser.php‎

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@@ -177,6 +177,10 @@ class Parser extends Core
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'field' => 'fields',
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'options' => array('parseField' => 'table'),
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),
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'FORCE' => array(
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'class' => 'PhpMyAdmin\\SqlParser\\Components\\IndexHint',
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'field' => 'index_hints',
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),
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'FROM' => array(
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'class' => 'PhpMyAdmin\\SqlParser\\Components\\ExpressionArray',
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'field' => 'from',
@@ -190,6 +194,10 @@ class Parser extends Core
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'class' => 'PhpMyAdmin\\SqlParser\\Components\\Condition',
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'field' => 'having',
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),
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'IGNORE' => array(
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'class' => 'PhpMyAdmin\\SqlParser\\Components\\IndexHint',
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'field' => 'index_hints',
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),
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'INTO' => array(
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'class' => 'PhpMyAdmin\\SqlParser\\Components\\IntoKeyword',
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'field' => 'into',
@@ -308,6 +316,10 @@ class Parser extends Core
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'field' => 'tables',
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'options' => array('parseField' => 'table'),
310318
),
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'USE' => array(
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'class' => 'PhpMyAdmin\\SqlParser\\Components\\IndexHint',
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'field' => 'index_hints',
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),
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'VALUE' => array(
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'class' => 'PhpMyAdmin\\SqlParser\\Components\\Array2d',
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'field' => 'values',

‎src/Statement.php‎

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@@ -497,6 +497,17 @@ public function validateClauseOrder($parser, $list)
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$clauseType
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);
499499

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if ($clauseStartIdx !== -1
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&& $this instanceof Statements\SelectStatement
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&& ($clauseType === 'FORCE'
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|| $clauseType === 'IGNORE'
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|| $clauseType === 'USE')
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) {
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// TODO: ordering of clauses in a SELECT statement with
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// Index hints is not supported
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return true;
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}
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500511
// Handle ordering of Multiple Joins in a query
501512
if ($clauseStartIdx !== -1) {
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if ($minJoin === 0 && stripos($clauseType, 'JOIN')) {

‎src/Statements/SelectStatement.php‎

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@@ -91,6 +91,9 @@ class SelectStatement extends Statement
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'_SELECT' => array('SELECT', 1),
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'INTO' => array('INTO', 3),
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'FROM' => array('FROM', 3),
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'FORCE' => array('FORCE', 1),
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'USE' => array('USE', 1),
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'IGNORE' => array('IGNORE', 3),
9497
'PARTITION' => array('PARTITION', 3),
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9699
'JOIN' => array('JOIN', 1),
@@ -135,6 +138,13 @@ class SelectStatement extends Statement
135138
*/
136139
public $from = array();
137140

141+
/**
142+
* Index hints
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*
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* @var IndexHint[]
145+
*/
146+
public $index_hints;
147+
138148
/**
139149
* Partitions used as source for this statement.
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*

‎tests/Builder/SelectStatementTest.php‎

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$stmt->build()
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);
104104
}
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public function testBuildIndexHint()
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{
108+
$query = 'SELECT * FROM address FORCE INDEX (idx_fk_city_id) IGNORE KEY FOR GROUP BY (a, b,c) WHERE city_id<0 ';
109+
$parser = new Parser($query);
110+
$stmt = $parser->statements[0];
111+
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$this->assertEquals(
113+
$query,
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$stmt->build()
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);
116+
}
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}

‎tests/Parser/SelectStatementTest.php‎

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@@ -69,6 +69,12 @@ public function testSelectProvider()
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array('parser/parseSelectEndOptionsErr'),
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array('parser/parseSelectUnion'),
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array('parser/parseSelectUnion2'),
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array('parser/parseSelectIndexHint1'),
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array('parser/parseSelectIndexHint2'),
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array('parser/parseSelectIndexHintErr1'),
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array('parser/parseSelectIndexHintErr2'),
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array('parser/parseSelectIndexHintErr3'),
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array('parser/parseSelectIndexHintErr4'),
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);
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}
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}

‎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;

‎tests/data/parser/parseSelectIndexHint1.out‎

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‎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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