Improve comments referring snapshot's subxip array.
It was referred to as subxact array in a few places and subxip array in others. By changing it to subxip array, we make it consistent with similar references to xip array. Author: Japin Li Reviewd by: Julien Rouhaud, Richard Guo Discussion: https://postgr.es/m/MEYP282MB1669DCE7AC193A947CED2A95B6009@MEYP282MB1669.AUSP282.PROD.OUTLOOK.COM
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@ -2409,7 +2409,7 @@ GetSnapshotData(Snapshot snapshot)
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* We could try to store xids into xip[] first and then into subxip[]
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* if there are too many xids. That only works if the snapshot doesn't
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* overflow because we do not search subxip[] in that case. A simpler
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* way is to just store all xids in the subxact array because this is
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* way is to just store all xids in the subxip array because this is
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* by far the bigger array. We just leave the xip array empty.
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*
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* Either way we need to change the way XidInMVCCSnapshot() works
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@ -2345,7 +2345,7 @@ XidInMVCCSnapshot(TransactionId xid, Snapshot snapshot)
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else
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{
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/*
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* In recovery we store all xids in the subxact array because it is by
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* In recovery we store all xids in the subxip array because it is by
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* far the bigger array, and we mostly don't know which xids are
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* top-level and which are subxacts. The xip array is empty.
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*
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