[5.5] Fix column listing for postgres db driver.

src/Illuminate/Database/Schema/Grammars/PostgresGrammar.php

@@ -41,12 +41,11 @@ public function compileTableExists()
     /**
      * Compile the query to determine the list of columns.
      *
-     * @param  string  $table
      * @return string
      */
-    public function compileColumnListing($table)
+    public function compileColumnListing()
     {
-        return "select column_name from information_schema.columns where table_name = '$table'";
+        return 'select column_name from information_schema.columns where table_schema = ? and table_name = ?';
     }
 
     /**

src/Illuminate/Database/Schema/PostgresBuilder.php

@@ -58,4 +58,27 @@ protected function getAllTables()
             $this->grammar->compileGetAllTables($this->connection->getConfig('schema'))
         );
     }
+
+    /**
+     * Get the column listing for a given table.
+     *
+     * @param  string  $table
+     * @return array
+     */
+    public function getColumnListing($table)
+    {
+        if (is_array($schema = $this->connection->getConfig('schema'))) {
+            $schema = head($schema);
+        }
+
+        $schema = $schema ? $schema : 'public';
+
+        $table = $this->connection->getTablePrefix().$table;
+
+        $results = $this->connection->select(
+            $this->grammar->compileColumnListing(), [$schema, $table]
+        );
+
+        return $this->connection->getPostProcessor()->processColumnListing($results);
+    }
 }