}
void assignASTParams() throws HblException {
Validate.notNull(selectAST, "statement not prepared");
if (prepper == null) {
prepper = new HBLQueryPrep(new CommonTreeNodeStream(selectAST));
prepper.setHblParams(parameters);
prepper.setQueryVisitor(qVisitor);
prepper.setErrorReporter(prepperErrors);
} else {
prepper.reset();