+ /**
+ * IGNORE INDEX clause. Unlikely to be useful for anything but MySQL. This
+ * is only needed because a) MySQL must be as efficient as possible due to
+ * its use on Wikipedia, and b) MySQL 4.0 is kind of dumb sometimes about
+ * which index to pick. Anyway, other databases might have different
+ * indexes on a given table. So don't bother overriding this unless you're
+ * MySQL.
+ * @param string $index
+ * @return string
+ */
+ public function ignoreIndexClause( $index ) {
+ return '';
+ }
+