adding extreme debugging when wp_debug is true

wp-content/db.php

@@ -416,6 +416,11 @@ class hyperdb extends wpdb {
 
 		$this->run_callbacks( 'dataset_found', $dataset );
 
+        if (WP_DEBUG === true) {
+            $_ai_msg = sprintf("We choose dataset %s for query '%s'", $this->dataset, $query);
+            $this->print_error($_ai_msg);
+        }
+
 		if ( empty( $this->hyper_servers ) ) {
 			if ( $this->is_mysql_connection( $this->dbh ) )
 				return $this->dbh;