Github user windpiger commented on the issue:
    For test case 
      test("intersect") {
        checkSQL("SELECT * FROM t0 INTERSECT SELECT * FROM t0", "intersect")

    when `placeholder` & `childPlan` are `PlanLater MetaStoreRelation[#87] 
default t0`,
    and `candicate p` is `PlanLater MetaStoreRelation[#88] default t0`, 
    these two will be equal `without` output compare, that is `p == 
placeholder`, it will transform to `childPlan`.
    That will cause Exception 
    `Could't find id#88L in [id#87L]`.
    If we don't change the equal, it will be OK.
    I think we should not change the MetaStoreRelation equal logic

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