Github user windpiger commented on the issue:
https://github.com/apache/spark/pull/16549
For test case
```
test("intersect") {
checkSQL("SELECT * FROM t0 INTERSECT SELECT * FROM t0", "intersect")
}
```
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/QueryPlanner.scala#L83
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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