Add a new TransactionDBOptions txn_commit_bypass_memtable_threshold
#13304
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Summary: ... to makes it easier to use the new transaction feature
commit_bypass_memtable
. Instead of needing to specify the option when creating a transaction, this option allows users to specify a threshold on the number of updates in a transaction to determine when to skip memtables writes for a transaction.Test plan: a new unit test for the new option