Move schema part to the index

In SQLite, creating an index in another schema is done by prepending the
index name with the schema, while the table name must be unprefixed.

psalm.xml.dist

@@ -326,6 +326,7 @@
                 <referencedMethod name="Doctrine\DBAL\Platforms\SQLServerPlatform::getListTableForeignKeysSQL"/>
                 <referencedMethod name="Doctrine\DBAL\Platforms\SQLServerPlatform::getListTableIndexesSQL"/>
                 <referencedMethod name="Doctrine\DBAL\Platforms\SQLServerPlatform::getListTableMetadataSQL"/>
+                <referencedMethod name="Doctrine\DBAL\Platforms\SqlitePlatform::disableSchemaEmulation"/>
                 <referencedMethod name="Doctrine\DBAL\Platforms\SqlitePlatform::getListTableColumnsSQL"/>
                 <referencedMethod name="Doctrine\DBAL\Platforms\SqlitePlatform::getListTableForeignKeysSQL"/>
                 <referencedMethod name="Doctrine\DBAL\Platforms\SqlitePlatform::getListTableIndexesSQL"/>

src/Platforms/AbstractPlatform.php

@@ -2477,6 +2477,11 @@ public function getCreateIndexSQL(Index $index, $table)
         $name    = $index->getQuotedName($this);
         $columns = $index->getColumns();
 
+        if ($this instanceof SqlitePlatform && strpos($table, '.') !== false) {
+            [$schema, $table] = explode('.', $table);
+            $name             = $schema . '.' . $name;
+        }
+
         if (count($columns) === 0) {
             throw new InvalidArgumentException(sprintf(
                 'Incomplete or invalid index definition %s on table %s',

tests/Functional/Platform/OtherSchemaTest.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Doctrine\DBAL\Tests\Functional\Platform;
+
+use Doctrine\DBAL\Platforms\SqlitePlatform;
+use Doctrine\DBAL\Schema\Table;
+use Doctrine\DBAL\Tests\FunctionalTestCase;
+use Doctrine\DBAL\Types\Types;
+
+class OtherSchemaTest extends FunctionalTestCase
+{
+    public function testATableCanBeCreatedInAnotherSchema(): void
+    {
+        $databasePlatform = $this->connection->getDatabasePlatform();
+        if (! ($databasePlatform instanceof SqlitePlatform)) {
+            self::markTestSkipped('This test requires SQLite');
+        }
+
+        $this->connection->executeStatement("ATTACH DATABASE '/tmp/test_other_schema.sqlite' AS other");
+        $databasePlatform->disableSchemaEmulation();
+
+        $table = new Table('other.test_other_schema');
+        $table->addColumn('id', Types::INTEGER);
+        $table->addIndex(['id']);
+
+        $this->dropAndCreateTable($table);
+        $this->connection->insert('other.test_other_schema', ['id' => 1]);
+
+        self::assertEquals(1, $this->connection->fetchOne('SELECT COUNT(*) FROM other.test_other_schema'));
+    }
+}

tests/Platforms/SqlitePlatformTest.php

@@ -17,7 +17,10 @@ class SqlitePlatformTest extends AbstractPlatformTestCase
 {
     public function createPlatform(): AbstractPlatform
     {
-        return new SqlitePlatform();
+        $platform =  new SqlitePlatform();
+        $platform->disableSchemaEmulation();
+
+        return $platform;
     }
 
     public function getGenerateTableSql(): string
@@ -768,4 +771,19 @@ public function testGetCreateTableSQLWithColumnCollation(): void
             $this->platform->getCreateTableSQL($table),
         );
     }
+
+    public function testCreateTableInOtherSchema(): void
+    {
+        $table = new Table('other_schema.foo');
+        $table->addColumn('id', Types::INTEGER);
+        $table->addIndex(['id']);
+
+        self::assertSame(
+            [
+                'CREATE TABLE other_schema.foo (id INTEGER NOT NULL)',
+                'CREATE INDEX other_schema.IDX_D9A8AD0DBF396750 ON foo (id)',
+            ],
+            $this->platform->getCreateTableSQL($table),
+        );
+    }
 }