[PATCH v2 4/7] vinyl: allow to skip certain statements on read

[Konstantin Osipov]

* Vladimir Davydov <vdavydov.dev at gmail.com> [18/08/21 15:19]:
> In the scope of #2129 we will defer insertion of certain DELETE
> statements into secondary indexes until primary index compaction.
> However, by the time we invoke compaction, new statements might
> have been inserted into the space for the same set of keys.
> If that happens, insertion of a deferred DELETE will break the
> invariant which the read iterator relies upon: that for any key
> older sources store older statements. To avoid that, let's add
> a new per statement flag, VY_STMT_SKIP_READ, and make the read
> iterator ignore statements marked with it.

It's ok to push. Perhaps we could mark such statements with
max-lsn - 1, as discussed, but we can refactor the code to do it
later.

 

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Konstantin Osipov, Moscow, Russia, +7 903 626 22 32
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