diff --git a/lib/Doctrine/DBAL/Platforms/AbstractPlatform.php b/lib/Doctrine/DBAL/Platforms/AbstractPlatform.php
index aeac616d514..80a002b6072 100644
--- a/lib/Doctrine/DBAL/Platforms/AbstractPlatform.php
+++ b/lib/Doctrine/DBAL/Platforms/AbstractPlatform.php
@@ -1408,7 +1408,9 @@ public function getDropTableSQL($table)
 
         if ($table instanceof Table) {
             $table = $table->getQuotedName($this);
-        } elseif (! is_string($table)) {
+        }
+
+        if (! is_string($table)) {
             throw new InvalidArgumentException('getDropTableSQL() expects $table parameter to be string or \Doctrine\DBAL\Schema\Table.');
         }
 
@@ -1784,7 +1786,7 @@ public function getCreateIndexSQL(Index $index, $table)
             $table = $table->getQuotedName($this);
         }
         $name    = $index->getQuotedName($this);
-        $columns = $index->getQuotedColumns($this);
+        $columns = $index->getColumns();
 
         if (count($columns) === 0) {
             throw new InvalidArgumentException("Incomplete definition. 'columns' required.");
@@ -1795,7 +1797,7 @@ public function getCreateIndexSQL(Index $index, $table)
         }
 
         $query  = 'CREATE ' . $this->getCreateIndexSQLFlags($index) . 'INDEX ' . $name . ' ON ' . $table;
-        $query .= ' (' . $this->getIndexFieldDeclarationListSQL($columns) . ')' . $this->getPartialIndexSQL($index);
+        $query .= ' (' . $this->getIndexFieldDeclarationListSQL($index) . ')' . $this->getPartialIndexSQL($index);
 
         return $query;
     }
@@ -1833,7 +1835,7 @@ protected function getCreateIndexSQLFlags(Index $index)
      */
     public function getCreatePrimaryKeySQL(Index $index, $table)
     {
-        return 'ALTER TABLE ' . $table . ' ADD PRIMARY KEY (' . $this->getIndexFieldDeclarationListSQL($index->getQuotedColumns($this)) . ')';
+        return 'ALTER TABLE ' . $table . ' ADD PRIMARY KEY (' . $this->getIndexFieldDeclarationListSQL($index) . ')';
     }
 
     /**
@@ -2337,7 +2339,7 @@ public function getCheckDeclarationSQL(array $definition)
      */
     public function getUniqueConstraintDeclarationSQL($name, Index $index)
     {
-        $columns = $index->getQuotedColumns($this);
+        $columns = $index->getColumns();
         $name    = new Identifier($name);
 
         if (count($columns) === 0) {
@@ -2345,7 +2347,7 @@ public function getUniqueConstraintDeclarationSQL($name, Index $index)
         }
 
         return 'CONSTRAINT ' . $name->getQuotedName($this) . ' UNIQUE ('
-            . $this->getIndexFieldDeclarationListSQL($columns)
+            . $this->getIndexFieldDeclarationListSQL($index)
             . ')' . $this->getPartialIndexSQL($index);
     }
 
@@ -2362,7 +2364,7 @@ public function getUniqueConstraintDeclarationSQL($name, Index $index)
      */
     public function getIndexDeclarationSQL($name, Index $index)
     {
-        $columns = $index->getQuotedColumns($this);
+        $columns = $index->getColumns();
         $name    = new Identifier($name);
 
         if (count($columns) === 0) {
@@ -2370,7 +2372,7 @@ public function getIndexDeclarationSQL($name, Index $index)
         }
 
         return $this->getCreateIndexSQLFlags($index) . 'INDEX ' . $name->getQuotedName($this) . ' ('
-            . $this->getIndexFieldDeclarationListSQL($columns)
+            . $this->getIndexFieldDeclarationListSQL($index)
             . ')' . $this->getPartialIndexSQL($index);
     }
 
@@ -2392,17 +2394,23 @@ public function getCustomTypeDeclarationSQL(array $columnDef)
      * Obtains DBMS specific SQL code portion needed to set an index
      * declaration to be used in statements like CREATE TABLE.
      *
-     * @param mixed[][] $fields
-     *
-     * @return string
+     * @param mixed[]|Index $columnsOrIndex array declaration is deprecated, prefer passing Index to this method
      */
-    public function getIndexFieldDeclarationListSQL(array $fields)
+    public function getIndexFieldDeclarationListSQL($columnsOrIndex) : string
     {
+        if ($columnsOrIndex instanceof Index) {
+            return implode(', ', $columnsOrIndex->getQuotedColumns($this));
+        }
+
+        if (! is_array($columnsOrIndex)) {
+            throw new InvalidArgumentException('Fields argument should be an Index or array.');
+        }
+
         $ret = [];
 
-        foreach ($fields as $field => $definition) {
+        foreach ($columnsOrIndex as $column => $definition) {
             if (is_array($definition)) {
-                $ret[] = $field;
+                $ret[] = $column;
             } else {
                 $ret[] = $definition;
             }
@@ -3073,6 +3081,14 @@ public function supportsPartialIndexes()
         return false;
     }
 
+    /**
+     * Whether the platform supports indexes with column length definitions.
+     */
+    public function supportsColumnLengthIndexes() : bool
+    {
+        return false;
+    }
+
     /**
      * Whether the platform supports altering tables.
      *
diff --git a/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php b/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
index 744aa08a4bd..e17d3736041 100644
--- a/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
+++ b/lib/Doctrine/DBAL/Platforms/MySqlPlatform.php
@@ -645,7 +645,7 @@ protected function getPreAlterTableIndexForeignKeySQL(TableDiff $diff)
 
                     $query  = 'ALTER TABLE ' . $table . ' DROP INDEX ' . $remIndex->getName() . ', ';
                     $query .= 'ADD ' . $indexClause;
-                    $query .= ' (' . $this->getIndexFieldDeclarationListSQL($addIndex->getQuotedColumns($this)) . ')';
+                    $query .= ' (' . $this->getIndexFieldDeclarationListSQL($addIndex) . ')';
 
                     $sql[] = $query;
 
@@ -1132,4 +1132,12 @@ public function getDefaultTransactionIsolationLevel()
     {
         return TransactionIsolationLevel::REPEATABLE_READ;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsColumnLengthIndexes() : bool
+    {
+        return true;
+    }
 }
diff --git a/lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php b/lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php
index 353cfe0b2a9..88578690d77 100644
--- a/lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php
+++ b/lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php
@@ -320,7 +320,7 @@ public function getCreatePrimaryKeySQL(Index $index, $table)
             $flags = ' NONCLUSTERED';
         }
 
-        return 'ALTER TABLE ' . $table . ' ADD PRIMARY KEY' . $flags . ' (' . $this->getIndexFieldDeclarationListSQL($index->getQuotedColumns($this)) . ')';
+        return 'ALTER TABLE ' . $table . ' ADD PRIMARY KEY' . $flags . ' (' . $this->getIndexFieldDeclarationListSQL($index) . ')';
     }
 
     /**
diff --git a/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php b/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php
index 06ee2c2b2aa..9b917427fd8 100644
--- a/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php
+++ b/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php
@@ -843,17 +843,26 @@ protected function _getPortableTableIndexesList($tableIndexRows, $tableName = nu
             $keyName = strtolower($keyName);
 
             if (! isset($result[$keyName])) {
+                $options = [
+                    'lengths' => [],
+                ];
+
+                if (isset($tableIndex['where'])) {
+                    $options['where'] = $tableIndex['where'];
+                }
+
                 $result[$keyName] = [
                     'name' => $indexName,
-                    'columns' => [$tableIndex['column_name']],
+                    'columns' => [],
                     'unique' => $tableIndex['non_unique'] ? false : true,
                     'primary' => $tableIndex['primary'],
                     'flags' => $tableIndex['flags'] ?? [],
-                    'options' => isset($tableIndex['where']) ? ['where' => $tableIndex['where']] : [],
+                    'options' => $options,
                 ];
-            } else {
-                $result[$keyName]['columns'][] = $tableIndex['column_name'];
             }
+
+            $result[$keyName]['columns'][]            = $tableIndex['column_name'];
+            $result[$keyName]['options']['lengths'][] = $tableIndex['length'] ?? null;
         }
 
         $eventManager = $this->_platform->getEventManager();
diff --git a/lib/Doctrine/DBAL/Schema/Index.php b/lib/Doctrine/DBAL/Schema/Index.php
index cc6bce37a13..bae6d218cb6 100644
--- a/lib/Doctrine/DBAL/Schema/Index.php
+++ b/lib/Doctrine/DBAL/Schema/Index.php
@@ -7,6 +7,7 @@
 use function array_keys;
 use function array_map;
 use function array_search;
+use function array_shift;
 use function count;
 use function is_string;
 use function strtolower;
@@ -97,10 +98,21 @@ public function getColumns()
      */
     public function getQuotedColumns(AbstractPlatform $platform)
     {
+        $subParts = $platform->supportsColumnLengthIndexes() && $this->hasOption('lengths')
+            ? $this->getOption('lengths') : [];
+
         $columns = [];
 
         foreach ($this->_columns as $column) {
-            $columns[] = $column->getQuotedName($platform);
+            $length = array_shift($subParts);
+
+            $quotedColumn = $column->getQuotedName($platform);
+
+            if ($length !== null) {
+                $quotedColumn .= '(' . $length . ')';
+            }
+
+            $columns[] = $quotedColumn;
         }
 
         return $columns;
diff --git a/lib/Doctrine/DBAL/Schema/MySqlSchemaManager.php b/lib/Doctrine/DBAL/Schema/MySqlSchemaManager.php
index 37518cc15ce..d0f25cb6f79 100644
--- a/lib/Doctrine/DBAL/Schema/MySqlSchemaManager.php
+++ b/lib/Doctrine/DBAL/Schema/MySqlSchemaManager.php
@@ -67,6 +67,8 @@ protected function _getPortableTableIndexesList($tableIndexes, $tableName = null
             } elseif (strpos($v['index_type'], 'SPATIAL') !== false) {
                 $v['flags'] = ['SPATIAL'];
             }
+            $v['length'] = $v['sub_part'] ?? null;
+
             $tableIndexes[$k] = $v;
         }
 
diff --git a/tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php b/tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php
index 425039fa023..1c0afc93e66 100644
--- a/tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php
+++ b/tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php
@@ -1555,4 +1555,24 @@ public function testPrimaryKeyAutoIncrement()
 
         $this->assertGreaterThan($lastUsedIdBeforeDelete, $lastUsedIdAfterDelete);
     }
+
+    public function testGenerateAnIndexWithPartialColumnLength() : void
+    {
+        if (! $this->schemaManager->getDatabasePlatform()->supportsColumnLengthIndexes()) {
+            self::markTestSkipped('This test is only supported on platforms that support indexes with column length definitions.');
+        }
+
+        $table = new Table('test_partial_column_index');
+        $table->addColumn('long_column', 'string', ['length' => 40]);
+        $table->addColumn('standard_column', 'integer');
+        $table->addIndex(['long_column'], 'partial_long_column_idx', [], ['lengths' => [4]]);
+        $table->addIndex(['standard_column', 'long_column'], 'standard_and_partial_idx', [], ['lengths' => [null, 2]]);
+
+        $expected = $table->getIndexes();
+
+        $this->schemaManager->dropAndCreateTable($table);
+
+        $onlineTable = $this->schemaManager->listTableDetails('test_partial_column_index');
+        self::assertEquals($expected, $onlineTable->getIndexes());
+    }
 }