Issue #2477413 by daffie, Crell, bzrudi71, stefan.r, catch, mradcliffe, chx:...

Issue #2477413 by daffie, Crell, bzrudi71, stefan.r, catch, mradcliffe, chx: Increase minimum version requirement for Postgres to 9.1.2

core/lib/Drupal/Core/Database/Driver/pgsql/Install/Tasks.php

@@ -51,7 +51,7 @@ public function name() {
    * {@inheritdoc}
    */
   public function minimumVersion() {
-    return '8.3';
+    return '9.1.2';
   }
 
   /**

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

@@ -329,7 +329,7 @@ protected function processField($field) {
     }
 
     if (!empty($field['unsigned'])) {
-      // Unsigned datatypes are not supported in PostgreSQL 8.3. In MySQL,
+      // Unsigned datatypes are not supported in PostgreSQL 9.1. In MySQL,
       // they are used to ensure a positive number is inserted and it also
       // doubles the maximum integer size that can be stored in a field.
       // The PostgreSQL schema in Drupal creates a check constraint
@@ -569,7 +569,7 @@ public function fieldSetNoDefault($table, $field) {
   }
 
   public function indexExists($table, $name) {
-    // Details http://www.postgresql.org/docs/8.3/interactive/view-pg-indexes.html
+    // Details http://www.postgresql.org/docs/9.1/interactive/view-pg-indexes.html
     $index_name = $this->ensureIdentifiersLength($table, $name, 'idx');
     // Remove leading and trailing quotes because the index name is in a WHERE
     // clause and not used as an identifier.