SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function mapAdd (children 1)
     ExpressionList (children 2)
      Function tuple (children 1)
       ExpressionList (children 2)
        Function array (children 1)
         ExpressionList (children 2)
          Function toUInt64 (children 1)
           ExpressionList (children 1)
            Literal UInt64_1
          Literal UInt64_2
        Function array (children 1)
         ExpressionList (children 1)
          Function toInt32 (children 1)
           ExpressionList (children 1)
            Literal UInt64_1
      Identifier map
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
