Issue #1812056 by chx, byrond: Allow hook_field_schema() implementations to specify indexes for fields based on a column prefix (field sql storage test failing on various MySQL engines due to indexing unbound text fields)

3 files changed, 27 insertions, 4 deletions

diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 9857e213a..399757910 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,6 +1,9 @@
 
 Drupal 7.37, xxxx-xx-xx (development version)
 -----------------------
+- Allowed hook_field_schema() implementations to specify indexes for fields
+  based on a fixed-length column prefix (rather than the entire column), as was
+  already allowed in hook_schema() implementations.
 - Fixed PDO exceptions on PostgreSQL when accessing invalid entity URLs.
 - Added a sites/all/libraries folder to the codebase, with instructions for
   using it.
diff --git a/modules/field/modules/field_sql_storage/field_sql_storage.module b/modules/field/modules/field_sql_storage/field_sql_storage.module
index c7201dd78..842893ad7 100644
--- a/modules/field/modules/field_sql_storage/field_sql_storage.module
+++ b/modules/field/modules/field_sql_storage/field_sql_storage.module
@@ -223,7 +223,17 @@ function _field_sql_storage_schema($field) {
   foreach ($field['indexes'] as $index_name => $columns) {
     $real_name = _field_sql_storage_indexname($field['field_name'], $index_name);
     foreach ($columns as $column_name) {
-      $current['indexes'][$real_name][] = _field_sql_storage_columnname($field['field_name'], $column_name);
+      // Indexes can be specified as either a column name or an array with
+      // column name and length. Allow for either case.
+      if (is_array($column_name)) {
+        $current['indexes'][$real_name][] = array(
+          _field_sql_storage_columnname($field['field_name'], $column_name[0]),
+          $column_name[1],
+        );
+      }
+      else {
+        $current['indexes'][$real_name][] = _field_sql_storage_columnname($field['field_name'], $column_name);
+      }
     }
   }
 
@@ -332,7 +342,17 @@ function field_sql_storage_field_storage_update_field($field, $prior_field, $has
         $real_name = _field_sql_storage_indexname($field['field_name'], $name);
         $real_columns = array();
         foreach ($columns as $column_name) {
-          $real_columns[] = _field_sql_storage_columnname($field['field_name'], $column_name);
+          // Indexes can be specified as either a column name or an array with
+          // column name and length. Allow for either case.
+          if (is_array($column_name)) {
+            $real_columns[] = array(
+              _field_sql_storage_columnname($field['field_name'], $column_name[0]),
+              $column_name[1],
+            );
+          }
+          else {
+            $real_columns[] = _field_sql_storage_columnname($field['field_name'], $column_name);
+          }
         }
         db_add_index($table, $real_name, $real_columns);
         db_add_index($revision_table, $real_name, $real_columns);
diff --git a/modules/field/modules/field_sql_storage/field_sql_storage.test b/modules/field/modules/field_sql_storage/field_sql_storage.test
index 072739cbb..7c88ac776 100644
--- a/modules/field/modules/field_sql_storage/field_sql_storage.test
+++ b/modules/field/modules/field_sql_storage/field_sql_storage.test
@@ -355,14 +355,14 @@ class FieldSqlStorageTestCase extends DrupalWebTestCase {
     field_attach_insert('test_entity', $entity);
 
     // Add an index
-    $field = array('field_name' => $field_name, 'indexes' => array('value' => array('value')));
+    $field = array('field_name' => $field_name, 'indexes' => array('value' => array(array('value', 255))));
     field_update_field($field);
     foreach ($tables as $table) {
       $this->assertTrue(Database::getConnection()->schema()->indexExists($table, "{$field_name}_value"), format_string("Index on value created in %table", array('%table' => $table)));
     }
 
     // Add a different index, removing the existing custom one.
-    $field = array('field_name' => $field_name, 'indexes' => array('value_format' => array('value', 'format')));
+    $field = array('field_name' => $field_name, 'indexes' => array('value_format' => array(array('value', 127), array('format', 127))));
     field_update_field($field);
     foreach ($tables as $table) {
       $this->assertTrue(Database::getConnection()->schema()->indexExists($table, "{$field_name}_value_format"), format_string("Index on value_format created in %table", array('%table' => $table)));