/**
* Parses a module.
*
* @param io input reference
* @return query parser
* @throws QueryException query exception
*/
final QueryParser parseQuery(final IO io) throws QueryException {
try (final QueryContext qctx = new QueryContext(qc)) {
final String input = string(io.read());
// parse query
final QueryParser qp = new QueryParser(input, io.path(), qctx, null);
module = QueryProcessor.isLibrary(input) ? qp.parseLibrary(true) : qp.parseMain();
return qp;
} catch (final IOException | QueryException ex) {
throw IOERR_X.get(info, ex);
}
}
/** @param args */
public static void main(String[] args) throws Exception {
// read serialised catalogue from file and parse
String catFile = args[0];
Catalogue cat = new Catalogue();
CatalogueParser catParser = new CatalogueParser(catFile, cat);
catParser.parse();
// read stdin, parse, and build canonical query plan
QueryParser queryParser = new QueryParser(cat, new InputStreamReader(System.in));
Operator plan = queryParser.parse();
System.out.println("Query Plan: " + plan.toString());
// create estimator visitor and apply it to canonical plan
Estimator est = new Estimator();
// plan.accept(est);
// create optimised plan
Optimiser opt = new Optimiser(cat);
Operator optPlan = opt.optimise(plan);
System.out.println("Optimised Plan: " + optPlan.toString());
}