fix token consumption so we dont get random data at the end

dynamodb/filter.odin

@@ -184,7 +184,17 @@ parse_filter_expression :: proc(
 ) -> (node: ^Filter_Node, ok: bool) {
 	t := tokenizer_init(expression)
 	node, ok = parse_or_expr(&t, attribute_names, attribute_values)
-	return
+	if !ok {
+		return nil, false
+	}
+
+	// Verify all tokens were consumed (no trailing garbage)
+	if trailing := tokenizer_next(&t); trailing != nil {
+		filter_node_destroy(node)
+		return nil, false
+	}
+
+	return node, true
 }
 
 parse_or_expr :: proc(