SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Identifier number
    Function dictGet (alias a) (children 1)
     ExpressionList (children 3)
      Literal \'executable_simple\'
      Literal \'a\'
      Identifier number
    Function dictGet (alias b) (children 1)
     ExpressionList (children 3)
      Literal \'executable_simple\'
      Literal \'b\'
      Identifier number
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function numbers (children 1)
       ExpressionList (children 1)
        Literal UInt64_1000000
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier number
     Literal UInt64_999999