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[refactor](sink) move where clase on mv to row distribution
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For better performance and elasticity, we move memtable from loadchannel to
sink, VTabletSinkV2 is introduced, then there are VTabletWriter and
VTabletSinkV2 distributing rows to tablets. where clauses on mvs are
executed in VTabletWriter, while VTabletSinkV2 needs it too. So common code
is moved to row distribution.

Actually, we can layer code by rows' data flow, then the code is much more
understood and maintainable.

ScanNode -> Sink/Writer (RowDistribution -> IndexChannel / DeltaWriter)
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@dataroaring
dataroaring committed Nov 7, 2023
1 parent ed0feb8 commit cba3380
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