Re: 2nd nested trasanctions supporting patch

Alvaro Herrera wrote:
>
> Hackers,
>
> This is the second patch for the nested transactions stuff. This one
> removes the global variables used in Snapshots (QuerySnapshot,
> SerializableSnapshot, SnapshotDirty, RecentXmin, RecentGlobalXmin and
> ReferentialIntegritySnapshotOverride) and puts the whole bunch in a
> single struct.
>
> It also adds some accesor functions so that other functions can read and
> modify what they need.

What's the performance impact caused by the accessor functions? I
thought most of the tuple visibility code is done in macros for some
reason.

Jan

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