SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t2_00856
   Function if (children 1)
    ExpressionList (children 3)
     Literal UInt64_1
     Literal UInt64_1
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier n
       Literal UInt64_0
