SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier mt
   Function equals (children 1)
    ExpressionList (children 2)
     Function toUInt64 (children 1)
      ExpressionList (children 1)
       Function substr (children 1)
        ExpressionList (children 3)
         Identifier _part
         Literal UInt64_1
         Function minus (children 1)
          ExpressionList (children 2)
           Function position (children 1)
            ExpressionList (children 2)
             Identifier _part
             Literal \'_\'
           Literal UInt64_1
     Literal UInt64_1