SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Identifier t1.k
    Identifier t2.x
    Identifier t3.x
   TablesInSelectQuery (children 3)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier adaptive_spill_03277_1 (alias t1)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier adaptive_spill_03277_2 (alias t2)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1.k
        Identifier t2.k
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier adaptive_spill_03277_3 (alias t3)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1.k
        Identifier t3.k
 Identifier Null
