Examples of org.apache.tajo.engine.parser.HiveQLAnalyzer$ANTLRNoCaseStringStream

org.apache.tajo.engine.parser.HiveQLAnalyzer

This class provides and implementation for a case insensitive token checker for the lexical analysis part of antlr. By converting the token stream into upper case at the time when lexical rules are checked, this class ensures that the lexical rules need to just match the token with upper case letters as opposed to combination of upper case and lower case characteres. This is purely used for matching lexical rules. The actual token text is stored in the same way as the user input without actually converting it into an upper case. The token values are generated by the consume() function of the super class ANTLRStringStream. The LA() function is the lookahead funtion and is purely used for matching lexical rules. This also means that the grammar will only accept capitalized tokens in case it is run from other tools like antlrworks which do not have the ANTLRNoCaseStringStream implementation.

  }


  public void start() {
    try  {
      analyzer = new SQLAnalyzer();
      converter = new HiveQLAnalyzer();
      preVerifier = new PreLogicalPlanVerifier(context.getCatalog());
      planner = new LogicalPlanner(context.getCatalog());
      optimizer = new LogicalOptimizer(context.getConf());
      annotatedPlanVerifier = new LogicalPlanVerifier(context.getConf(), context.getCatalog());

      CatalogService catalog = getQueryTaskContext().getQueryMasterContext().getWorkerContext().getCatalog();
      LogicalPlanner planner = new LogicalPlanner(catalog);
      LogicalOptimizer optimizer = new LogicalOptimizer(systemConf);
      Expr expr;
      if (queryContext.isHiveQueryMode()) {
        HiveQLAnalyzer HiveQLAnalyzer = new HiveQLAnalyzer();
        expr = HiveQLAnalyzer.parse(sql);
      } else {
        SQLAnalyzer analyzer = new SQLAnalyzer();
        expr = analyzer.parse(sql);
      }
      LogicalPlan plan = planner.createPlan(session, expr);

Examples of org.apache.tajo.engine.parser.HiveQLAnalyzer$ANTLRNoCaseStringStream

Related Classes of org.apache.tajo.engine.parser.HiveQLAnalyzer$ANTLRNoCaseStringStream