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由 Heikki Linnakangas 提交于
We used to scan the list of LocalDistribXactData objects, in shared memory, to find the distributed XID corresponding a local XID, during visibility checks. That turns out to be unnecessary: at the point when we scanned the list, the distributed log SLRU has already been updated, so we might as well check that directly. Thanks to @ashwinstar for pointing this out.
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