+ /**
+ * Add a new index to an existing table if none of the given indexes exist
+ *
+ * @param string $table Name of the table to modify
+ * @param string[] $indexes Name of the indexes to check. $indexes[0] should
+ * be the one actually being added.
+ * @param string $patch Path to the patch file
+ * @param bool $fullpath Whether to treat $patch path as a relative or not
+ * @return bool False if this was skipped because schema changes are skipped
+ */
+ protected function addIndexIfNoneExist( $table, $indexes, $patch, $fullpath = false ) {
+ if ( !$this->doTable( $table ) ) {
+ return true;
+ }
+
+ if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
+ $this->output( "...skipping: '$table' table doesn't exist yet.\n" );
+ return true;
+ }
+
+ $newIndex = $indexes[0];
+ foreach ( $indexes as $index ) {
+ if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
+ $this->output(
+ "...skipping index $newIndex because index $index already set on $table table.\n"
+ );
+ return true;
+ }
+ }
+
+ return $this->applyPatch( $patch, $fullpath, "Adding index $index to table $table" );
+ }
+