SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function mapAdd (children 1)
     ExpressionList (children 3)
      Function CAST (children 1)
       ExpressionList (children 2)
        Identifier m
        Literal \'Map(UInt8, UInt8)\'
      Function map (children 1)
       ExpressionList (children 2)
        Literal UInt64_1
        Literal UInt64_1
      Function map (children 1)
       ExpressionList (children 2)
        Literal UInt64_2
        Literal UInt64_2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
