@Override
    public Object process(
        Node nd, Stack<Node> stack, NodeProcessorCtx procCtx, Object... nodeOutputs)
        throws SemanticException {

      JoinTypeCheckCtx ctx = (JoinTypeCheckCtx) procCtx;
      if (ctx.getError() != null) {
        return null;
      }

      ASTNode expr = (ASTNode) nd;
      ASTNode parent = stack.size() > 1 ? (ASTNode) stack.get(stack.size() - 2) : null;

      if (expr.getType() != HiveParser.TOK_TABLE_OR_COL) {
        ctx.setError(ErrorMsg.INVALID_COLUMN.getMsg(expr), expr);
        return null;
      }

      assert (expr.getChildCount() == 1);
      String tableOrCol = BaseSemanticAnalyzer.unescapeIdentifier(expr.getChild(0).getText());

      boolean qualifiedAccess = (parent != null && parent.getType() == HiveParser.DOT);

      ColumnInfo colInfo = null;
      if (!qualifiedAccess) {
        colInfo = getColInfo(ctx, null, tableOrCol, expr);
        // It's a column.
        return new ExprNodeColumnDesc(colInfo);
      } else if (hasTableAlias(ctx, tableOrCol, expr)) {
        return null;
      } else {
        // Qualified column access for which table was not found
        throw new SemanticException(ErrorMsg.INVALID_TABLE_ALIAS.getMsg(expr));
      }
    }
    @Override
    protected ExprNodeColumnDesc processQualifiedColRef(
        TypeCheckCtx ctx, ASTNode expr, Object... nodeOutputs) throws SemanticException {
      String tableAlias =
          BaseSemanticAnalyzer.unescapeIdentifier(expr.getChild(0).getChild(0).getText());
      // NOTE: tableAlias must be a valid non-ambiguous table alias,
      // because we've checked that in TOK_TABLE_OR_COL's process method.
      ColumnInfo colInfo =
          getColInfo(
              (JoinTypeCheckCtx) ctx,
              tableAlias,
              ((ExprNodeConstantDesc) nodeOutputs[1]).getValue().toString(),
              expr);

      if (colInfo == null) {
        ctx.setError(ErrorMsg.INVALID_COLUMN.getMsg(expr.getChild(1)), expr);
        return null;
      }
      return new ExprNodeColumnDesc(
          colInfo.getType(), colInfo.getInternalName(), tableAlias, colInfo.getIsVirtualCol());
    }
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  public void validate() throws SemanticException {

    if ((this.getCols() == null) || (this.getCols().size() == 0)) {
      // for now make sure that serde exists
      if (StringUtils.isEmpty(this.getSerName())
          || !SerDeUtils.shouldGetColsFromSerDe(this.getSerName())) {
        throw new SemanticException(ErrorMsg.INVALID_TBL_DDL_SERDE.getMsg());
      }
      return;
    }

    if (this.getStorageHandler() == null) {
      try {
        Class<?> origin = Class.forName(this.getOutputFormat(), true, JavaUtils.getClassLoader());
        Class<? extends HiveOutputFormat> replaced =
            HiveFileFormatUtils.getOutputFormatSubstitute(origin);
        if (replaced == null) {
          throw new SemanticException(ErrorMsg.INVALID_OUTPUT_FORMAT_TYPE.getMsg());
        }
      } catch (ClassNotFoundException e) {
        throw new SemanticException(ErrorMsg.INVALID_OUTPUT_FORMAT_TYPE.getMsg());
      }
    }

    List<String> colNames = ParseUtils.validateColumnNameUniqueness(this.getCols());

    if (this.getBucketCols() != null) {
      // all columns in cluster and sort are valid columns
      Iterator<String> bucketCols = this.getBucketCols().iterator();
      while (bucketCols.hasNext()) {
        String bucketCol = bucketCols.next();
        boolean found = false;
        Iterator<String> colNamesIter = colNames.iterator();
        while (colNamesIter.hasNext()) {
          String colName = colNamesIter.next();
          if (bucketCol.equalsIgnoreCase(colName)) {
            found = true;
            break;
          }
        }
        if (!found) {
          throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg());
        }
      }
    }

    if (this.getSortCols() != null) {
      // all columns in cluster and sort are valid columns
      Iterator<Order> sortCols = this.getSortCols().iterator();
      while (sortCols.hasNext()) {
        String sortCol = sortCols.next().getCol();
        boolean found = false;
        Iterator<String> colNamesIter = colNames.iterator();
        while (colNamesIter.hasNext()) {
          String colName = colNamesIter.next();
          if (sortCol.equalsIgnoreCase(colName)) {
            found = true;
            break;
          }
        }
        if (!found) {
          throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg());
        }
      }
    }

    if (this.getPartCols() != null) {
      // there is no overlap between columns and partitioning columns
      Iterator<FieldSchema> partColsIter = this.getPartCols().iterator();
      while (partColsIter.hasNext()) {
        FieldSchema fs = partColsIter.next();
        String partCol = fs.getName();
        PrimitiveObjectInspectorUtils.PrimitiveTypeEntry pte =
            PrimitiveObjectInspectorUtils.getTypeEntryFromTypeName(fs.getType());
        if (null == pte) {
          throw new SemanticException(
              ErrorMsg.PARTITION_COLUMN_NON_PRIMITIVE.getMsg()
                  + " Found "
                  + partCol
                  + " of type: "
                  + fs.getType());
        }
        Iterator<String> colNamesIter = colNames.iterator();
        while (colNamesIter.hasNext()) {
          String colName = BaseSemanticAnalyzer.unescapeIdentifier(colNamesIter.next());
          if (partCol.equalsIgnoreCase(colName)) {
            throw new SemanticException(ErrorMsg.COLUMN_REPEATED_IN_PARTITIONING_COLS.getMsg());
          }
        }
      }
    }

    /* Validate skewed information. */
    ValidationUtility.validateSkewedInformation(
        colNames, this.getSkewedColNames(), this.getSkewedColValues());
  }