src/Database/Query/Condition.php
protected function mapConditionOperator($operator) {
        // $specials does not use drupal_static as its value never changes.
        static $specials = array(
            'BETWEEN' => array('delimiter' => ' AND '),
            'IN' => array('delimiter' => ', ', 'prefix' => '(', 'postfix' => ')'),
            'NOT IN' => array('delimiter' => ', ', 'prefix' => '(', 'postfix' => ')'),
            'EXISTS' => array('prefix' => '(', 'postfix' => ')'),
            'NOT EXISTS' => array('prefix' => '(', 'postfix' => ')'),
            'IS NULL' => array('use_value' => FALSE),
            'IS NOT NULL' => array('use_value' => FALSE),
            // Use backslash for escaping wildcard characters.
            'LIKE' => array('postfix' => " ESCAPE '\\\\'"),
            'NOT LIKE' => array('postfix' => " ESCAPE '\\\\'"),
            // These ones are here for performance reasons.
            '=' => array(),
            '<' => array(),
            '>' => array(),
            '>=' => array(),
            '<=' => array(),
        );
        if (isset($specials[$operator])) {
            $return = $specials[$operator];
        }
        else {
            // We need to upper case because PHP index matches are case sensitive but
            // do not need the more expensive drupal_strtoupper because SQL statements are ASCII.
            $operator = strtoupper($operator);
            $return = isset($specials[$operator]) ? $specials[$operator] : array();
        }

        $return += array('operator' => $operator);

        return $return;
    }
protected function mapConditionOperator($operator) {
        // $specials does not use drupal_static as its value never changes.
        static $specials = array(
            'BETWEEN' => array('delimiter' => ' AND '),
            'IN' => array('delimiter' => ', ', 'prefix' => '(', 'postfix' => ')'),
            'NOT IN' => array('delimiter' => ', ', 'prefix' => '(', 'postfix' => ')'),
            'EXISTS' => array('prefix' => '(', 'postfix' => ')'),
            'NOT EXISTS' => array('prefix' => '(', 'postfix' => ')'),
            'IS NULL' => array('use_value' => FALSE),
            'IS NOT NULL' => array('use_value' => FALSE),
            // Use backslash for escaping wildcard characters.
            'LIKE' => array('postfix' => " ESCAPE '\\\\'"),
            'NOT LIKE' => array('postfix' => " ESCAPE '\\\\'"),
            // These ones are here for performance reasons.
            '=' => array(),
            '<' => array(),
            '>' => array(),
            '>=' => array(),
            '<=' => array(),
        );
        if (isset($specials[$operator])) {
            $return = $specials[$operator];
        }
        else {
            // We need to upper case because PHP index matches are case sensitive but
            // do not need the more expensive drupal_strtoupper because SQL statements are ASCII.
            $operator = strtoupper($operator);
            $return = isset($specials[$operator]) ? $specials[$operator] : array();
        }

        $return += array('operator' => $operator);

        return $return;
    }
protected function mapConditionOperator ( $ operator ) { // $specials does not use drupal_static as its value never changes. static $ specials = array ( 'BETWEEN' => array ( 'delimiter' => ' AND ' ) , 'IN' => array ( 'delimiter' => ', ' , 'prefix' => '(' , 'postfix' => ')' ) , 'NOT IN' => array ( 'delimiter' => ', ' , 'prefix' => '(' , 'postfix' => ')' ) , 'EXISTS' => array ( 'prefix' => '(' , 'postfix' => ')' ) , 'NOT EXISTS' => array ( 'prefix' => '(' , 'postfix' => ')' ) , 'IS NULL' => array ( 'use_value' => FALSE ) , 'IS NOT NULL' => array ( 'use_value' => FALSE ) , // Use backslash for escaping wildcard characters. 'LIKE' => array ( 'postfix' => " ESCAPE '\\\\'" ) , 'NOT LIKE' => array ( 'postfix' => " ESCAPE '\\\\'" ) , // These ones are here for performance reasons. '=' => array ( ) , '<' => array ( ) , '>' => array ( ) , '>=' => array ( ) , '<=' => array ( ) , ) ; if ( isset ( $ specials [ $ operator ] ) ) { $ return = $ specials [ $ operator ] ; } else { // We need to upper case because PHP index matches are case sensitive but // do not need the more expensive drupal_strtoupper because SQL statements are ASCII. $ operator = strtoupper ( $ operator ) ; $ return = isset ( $ specials [ $ operator ] ) ? $ specials [ $ operator ] : array ( ) ; } $ return += array ( 'operator' => $ operator ) ; return $ return ; }
Gets any special processing requirements for the condition operator.

Some condition types require special processing, such as IN, because
the value data they pass in is not a simple value. This is a simple
overridable lookup function.

@param $operator
The condition operator, such as "IN", "BETWEEN", etc. Case-sensitive.

@return
The extra handling directives for the specified operator, or NULL.
Gets any special processing requirements for the condition operator .