[9.x] Add index hinting support to query builder

src/Illuminate/Database/Query/Builder.php

@@ -100,6 +100,13 @@ class Builder implements BuilderContract
      */
     public $from;
 
+    /**
+     * The index hint for the query.
+     *
+     * @var \Illuminate\Database\Query\IndexHint
+     */
+    public $indexHint;
+
     /**
      * The table joins for the query.
      *
@@ -458,6 +465,45 @@ public function from($table, $as = null)
         return $this;
     }
 
+    /**
+     * Add an index hint to suggest a query index.
+     *
+     * @param  string  $index
+     * @return $this
+     */
+    public function useIndex($index)
+    {
+        $this->indexHint = new IndexHint('hint', $index);
+
+        return $this;
+    }
+
+    /**
+     * Add an index hint to force a query index.
+     *
+     * @param  string  $index
+     * @return $this
+     */
+    public function forceIndex($index)
+    {
+        $this->indexHint = new IndexHint('force', $index);
+
+        return $this;
+    }
+
+    /**
+     * Add an index hint to ignore a query index.
+     *
+     * @param  string  $index
+     * @return $this
+     */
+    public function ignoreIndex($index)
+    {
+        $this->indexHint = new IndexHint('ignore', $index);
+
+        return $this;
+    }
+
     /**
      * Add a join clause to the query.
      *

src/Illuminate/Database/Query/Grammars/Grammar.php

@@ -36,6 +36,7 @@ class Grammar extends BaseGrammar
         'aggregate',
         'columns',
         'from',
+        'indexHint',
         'joins',
         'wheres',
         'groups',

src/Illuminate/Database/Query/Grammars/MySqlGrammar.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Database\Query\Grammars;
 
 use Illuminate\Database\Query\Builder;
+use Illuminate\Database\Query\IndexHint;
 use Illuminate\Support\Str;
 
 class MySqlGrammar extends Grammar
@@ -74,6 +75,22 @@ public function whereFullText(Builder $query, $where)
         return "match ({$columns}) against (".$value."{$mode}{$expanded})";
     }
 
+    /**
+     * Compile the index hints for the query.
+     *
+     * @param  \Illuminate\Database\Query\Builder  $query
+     * @param  \Illuminate\Database\Query\IndexHint  $indexHint
+     * @return string
+     */
+    protected function compileIndexHint(Builder $query, $indexHint)
+    {
+        return match ($indexHint->type) {
+            'hint' => "use index ({$indexHint->index})",
+            'force' => "force index ({$indexHint->index})",
+            default => "ignore index ({$indexHint->index})",
+        };
+    }
+
     /**
      * Compile an insert ignore statement into SQL.
      *

src/Illuminate/Database/Query/Grammars/SQLiteGrammar.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Database\Query\Grammars;
 
 use Illuminate\Database\Query\Builder;
+use Illuminate\Database\Query\IndexHint;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Str;
 
@@ -117,6 +118,20 @@ protected function dateBasedWhere($type, Builder $query, $where)
         return "strftime('{$type}', {$this->wrap($where['column'])}) {$where['operator']} cast({$value} as text)";
     }
 
+    /**
+     * Compile the index hints for the query.
+     *
+     * @param  \Illuminate\Database\Query\Builder  $query
+     * @param  \Illuminate\Database\Query\IndexHint  $indexHint
+     * @return string
+     */
+    protected function compileIndexHint(Builder $query, $indexHint)
+    {
+        return $indexHint->type === 'force'
+                ? "indexed by {$indexHint->index}"
+                : '';
+    }
+
     /**
      * Compile a "JSON length" statement into SQL.
      *

src/Illuminate/Database/Query/Grammars/SqlServerGrammar.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Database\Query\Grammars;
 
 use Illuminate\Database\Query\Builder;
+use Illuminate\Database\Query\IndexHint;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Str;
 
@@ -96,6 +97,20 @@ protected function compileFrom(Builder $query, $table)
         return $from;
     }
 
+    /**
+     * Compile the index hints for the query.
+     *
+     * @param  \Illuminate\Database\Query\Builder  $query
+     * @param  \Illuminate\Database\Query\IndexHint  $indexHint
+     * @return string
+     */
+    protected function compileIndexHint(Builder $query, $indexHint)
+    {
+        return $indexHint->type === 'force'
+                    ? "with (index({$indexHint->index}))"
+                    : '';
+    }
+
     /**
      * {@inheritdoc}
      *

src/Illuminate/Database/Query/IndexHint.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Illuminate\Database\Query;
+
+class IndexHint
+{
+    /**
+     * The type of query hint.
+     *
+     * @var string
+     */
+    public $type;
+
+    /**
+     * The name of the index.
+     *
+     * @var string
+     */
+    public $index;
+
+    /**
+     * Create a new index hint instance.
+     *
+     * @param  string  $type
+     * @param  string  $index
+     * @return void
+     */
+    public function __construct($type, $index)
+    {
+        $this->type = $type;
+        $this->index = $index;
+    }
+}

tests/Database/DatabaseQueryBuilderTest.php

@@ -5418,6 +5418,69 @@ public function testFromQuestionMarkOperatorOnPostgres()
         $this->assertSame('select * from "users" where "roles" ??& ?', $builder->toSql());
     }
 
+    public function testUseIndexMySql()
+    {
+        $builder = $this->getMySqlBuilder();
+        $builder->select('foo')->from('users')->useIndex('test_index');
+        $this->assertSame('select `foo` from `users` use index (test_index)', $builder->toSql());
+    }
+
+    public function testForceIndexMySql()
+    {
+        $builder = $this->getMySqlBuilder();
+        $builder->select('foo')->from('users')->forceIndex('test_index');
+        $this->assertSame('select `foo` from `users` force index (test_index)', $builder->toSql());
+    }
+
+    public function testIgnoreIndexMySql()
+    {
+        $builder = $this->getMySqlBuilder();
+        $builder->select('foo')->from('users')->ignoreIndex('test_index');
+        $this->assertSame('select `foo` from `users` ignore index (test_index)', $builder->toSql());
+    }
+
+    public function testUseIndexSqlite()
+    {
+        $builder = $this->getSQLiteBuilder();
+        $builder->select('foo')->from('users')->useIndex('test_index');
+        $this->assertSame('select "foo" from "users"', $builder->toSql());
+    }
+
+    public function testForceIndexSqlite()
+    {
+        $builder = $this->getSQLiteBuilder();
+        $builder->select('foo')->from('users')->forceIndex('test_index');
+        $this->assertSame('select "foo" from "users" indexed by test_index', $builder->toSql());
+    }
+
+    public function testIgnoreIndexSqlite()
+    {
+        $builder = $this->getSQLiteBuilder();
+        $builder->select('foo')->from('users')->ignoreIndex('test_index');
+        $this->assertSame('select "foo" from "users"', $builder->toSql());
+    }
+
+    public function testUseIndexSqlServer()
+    {
+        $builder = $this->getSqlServerBuilder();
+        $builder->select('foo')->from('users')->useIndex('test_index');
+        $this->assertSame('select [foo] from [users]', $builder->toSql());
+    }
+
+    public function testForceIndexSqlServer()
+    {
+        $builder = $this->getSqlServerBuilder();
+        $builder->select('foo')->from('users')->forceIndex('test_index');
+        $this->assertSame('select [foo] from [users] with (index(test_index))', $builder->toSql());
+    }
+
+    public function testIgnoreIndexSqlServer()
+    {
+        $builder = $this->getSqlServerBuilder();
+        $builder->select('foo')->from('users')->ignoreIndex('test_index');
+        $this->assertSame('select [foo] from [users]', $builder->toSql());
+    }
+
     public function testClone()
     {
         $builder = $this->getBuilder();