@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));
      }
    }
Пример #2
0
 private ASTNode getQueryASTNode(ASTNode node) {
   while (node != null && node.getType() != HiveParser.TOK_QUERY) {
     node = (ASTNode) node.getParent();
   }
   return node;
 }