Package org.apache.drill.common.expression

Examples of org.apache.drill.common.expression.TypedNullConstant

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          //            2) the parameter of matchedFuncHolder allows null input, or func's null_handling is NULL_IF_NULL (means null and non-null are exchangable).
          //        then replace NullExpression with a TypedNullConstant
          if (currentArg.equals(NullExpression.INSTANCE) &&
            ( parmType.getMode().equals(TypeProtos.DataMode.OPTIONAL) ||
              matchedFuncHolder.getNullHandling() == FunctionTemplate.NullHandling.NULL_IF_NULL)) {
            argsWithCast.add(new TypedNullConstant(parmType));
          } else if (Types.softEquals(parmType, currentArg.getMajorType(), matchedFuncHolder.getNullHandling() == FunctionTemplate.NullHandling.NULL_IF_NULL) ||
                     matchedFuncHolder.isFieldReader(i)) {
            //Case 2: argument and parameter matches, or parameter is FieldReader.  Do nothing.
            argsWithCast.add(currentArg);
          } else {
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      return matchedConvertToNullableFuncHolder.getExpr(funcName, args, ExpressionPosition.UNKNOWN);
    }

    private LogicalExpression rewriteNullExpression(LogicalExpression expr, MajorType type) {
      if(expr instanceof NullExpression) {
        return new TypedNullConstant(type);
      } else {
        return expr;
      }
    }
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      if (newMinor == MinorType.LATE) {
        // if the type still isn't fully bound, leave as cast expression.
        return new CastExpression(input, e.getMajorType(), e.getPosition());
      } else if (newMinor == MinorType.NULL) {
        // if input is a NULL expression, remove cast expression and return a TypedNullConstant directly.
        return new TypedNullConstant(Types.optional(e.getMajorType().getMinorType()));
      } else {
        // if the type is fully bound, convert to functioncall and materialze the function.
        MajorType type = e.getMajorType();

        // Get the cast function name from the map
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      }
    }
  }

  private static final TypedNullConstant createNullExpr(MinorType type) {
    return new TypedNullConstant(Types.optional(type));
  }
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      // materialize value vector readers from join expression
      LogicalExpression materializedLeftExpr;
      if (worker == null || status.isLeftPositionAllowed()) {
        materializedLeftExpr = ExpressionTreeMaterializer.materialize(leftFieldExpr, left, collector, context.getFunctionRegistry());
      } else {
        materializedLeftExpr = new TypedNullConstant(Types.optional(MinorType.INT));
      }
      if (collector.hasErrors())
        throw new ClassTransformationException(String.format(
            "Failure while trying to materialize incoming left field.  Errors:\n %s.", collector.toErrorString()));

      LogicalExpression materializedRightExpr;
      if (worker == null || status.isRightPositionAllowed()) {
        materializedRightExpr = ExpressionTreeMaterializer.materialize(rightFieldExpr, right, collector, context.getFunctionRegistry());
      } else {
        materializedRightExpr = new TypedNullConstant(Types.optional(MinorType.INT));
      }
      if (collector.hasErrors())
        throw new ClassTransformationException(String.format(
            "Failure while trying to materialize incoming right field.  Errors:\n %s.", collector.toErrorString()));
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      }
    }
  }

  private static final TypedNullConstant createNullExpr(MinorType type) {
    return new TypedNullConstant(Types.optional(type));
  }
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Related Classes of org.apache.drill.common.expression.TypedNullConstant

  • org.apache.drill.exec.expr.ExpressionTreeMaterializer
  • org.apache.drill.exec.expr.ExpressionTreeMaterializer$MaterializeVisitor
  • org.apache.drill.exec.physical.impl.join.MergeJoinBatch
  • org.apache.drill.exec.physical.impl.TestSimpleFunctions
  • org.apache.drill.exec.planner.logical.DrillOptiq
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