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Don't duplicate parallel seqscan shmem sizing logic in nbtree.
This is architecturally mildly problematic, which becomes more
pronounced with the upcoming introduction of pluggable storage.
To fix, teach heap_parallelscan_estimate() to deal with SnapshotAny
snapshots, and then use it from _bt_parallel_estimate_shared().
Author: Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de
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