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 map
        Literal \'Tuple(Array(UInt8), Array(UInt8))\'
      Function tuple (children 1)
       ExpressionList (children 2)
        Literal Array_[UInt64_1]
        Literal Array_[UInt64_1]
      Function tuple (children 1)
       ExpressionList (children 2)
        Literal Array_[UInt64_2]
        Literal Array_[UInt64_2]
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
