Esempio n. 1
0
  private MSorter createNewMSorter(
      FragmentContext context,
      List<Ordering> orderings,
      VectorAccessible batch,
      MappingSet mainMapping,
      MappingSet leftMapping,
      MappingSet rightMapping)
      throws ClassTransformationException, IOException, SchemaChangeException {
    CodeGenerator<MSorter> cg =
        CodeGenerator.get(
            MSorter.TEMPLATE_DEFINITION, context.getFunctionRegistry(), context.getOptions());
    ClassGenerator<MSorter> g = cg.getRoot();
    g.setMappingSet(mainMapping);

    for (Ordering od : orderings) {
      // first, we rewrite the evaluation stack for each side of the comparison.
      ErrorCollector collector = new ErrorCollectorImpl();
      final LogicalExpression expr =
          ExpressionTreeMaterializer.materialize(
              od.getExpr(), batch, collector, context.getFunctionRegistry());
      if (collector.hasErrors()) {
        throw new SchemaChangeException(
            "Failure while materializing expression. " + collector.toErrorString());
      }
      g.setMappingSet(leftMapping);
      HoldingContainer left = g.addExpr(expr, ClassGenerator.BlkCreateMode.FALSE);
      g.setMappingSet(rightMapping);
      HoldingContainer right = g.addExpr(expr, ClassGenerator.BlkCreateMode.FALSE);
      g.setMappingSet(mainMapping);

      // next we wrap the two comparison sides and add the expression block for the comparison.
      LogicalExpression fh =
          FunctionGenerationHelper.getOrderingComparator(
              od.nullsSortHigh(), left, right, context.getFunctionRegistry());
      HoldingContainer out = g.addExpr(fh, ClassGenerator.BlkCreateMode.FALSE);
      JConditional jc = g.getEvalBlock()._if(out.getValue().ne(JExpr.lit(0)));

      if (od.getDirection() == Direction.ASCENDING) {
        jc._then()._return(out.getValue());
      } else {
        jc._then()._return(out.getValue().minus());
      }
      g.rotateBlock();
    }

    g.rotateBlock();
    g.getEvalBlock()._return(JExpr.lit(0));

    return context.getImplementationClass(cg);
  }
Esempio n. 2
0
  private void generateComparisons(ClassGenerator<?> g, VectorAccessible batch)
      throws SchemaChangeException {
    g.setMappingSet(MAIN_MAPPING);

    for (Ordering od : popConfig.getOrderings()) {
      // first, we rewrite the evaluation stack for each side of the comparison.
      ErrorCollector collector = new ErrorCollectorImpl();
      final LogicalExpression expr =
          ExpressionTreeMaterializer.materialize(
              od.getExpr(), batch, collector, context.getFunctionRegistry());
      if (collector.hasErrors()) {
        throw new SchemaChangeException(
            "Failure while materializing expression. " + collector.toErrorString());
      }
      g.setMappingSet(LEFT_MAPPING);
      HoldingContainer left = g.addExpr(expr, ClassGenerator.BlkCreateMode.FALSE);
      g.setMappingSet(RIGHT_MAPPING);
      HoldingContainer right = g.addExpr(expr, ClassGenerator.BlkCreateMode.FALSE);
      g.setMappingSet(MAIN_MAPPING);

      // next we wrap the two comparison sides and add the expression block for the comparison.
      LogicalExpression fh =
          FunctionGenerationHelper.getOrderingComparator(
              od.nullsSortHigh(), left, right, context.getFunctionRegistry());
      HoldingContainer out = g.addExpr(fh, ClassGenerator.BlkCreateMode.FALSE);
      JConditional jc = g.getEvalBlock()._if(out.getValue().ne(JExpr.lit(0)));

      if (od.getDirection() == Direction.ASCENDING) {
        jc._then()._return(out.getValue());
      } else {
        jc._then()._return(out.getValue().minus());
      }
      g.rotateBlock();
    }

    g.rotateBlock();
    g.getEvalBlock()._return(JExpr.lit(0));
  }