DescribeQuery (children 1)
 TableExpression (children 1)
  Function mergeTreeIndex (children 1)
   ExpressionList (children 3)
    Function currentDatabase (children 1)
     ExpressionList
    Identifier t_merge_tree_index
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier with_marks
      Literal Bool_1
