Wenchen Fan

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what if the shuffle stage is being reused by other places? I don't think we can cancel it without a ref counting to prove it's not used anywhere.

I think it's more complicated than what you implemented now: what if the reuse stage is completed before we want to cancel the original stage? What if the reuse stage...

Does this change anything when MERGE_INTO_NESTED_TYPE_COERCION_ENABLED is false?

Is it possible to add a unit test by building physical plans directly? e.g. `RDDScanExec` can host a 0-partition RDD.

can we add some test cases following the geo types blocking PRs?

I removed all client side checks as it's not very meaningful. People can use the `TimeType` class directly and there is no point to only block SQL. People can use...