SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Identifier b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_lwu_sequence
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier a
     Literal UInt64_5
   Set
