question about SnapBuild

[ifquant]

i am some pullzed by Snapbuild.c
it seem some code can not reach  for ever.
SnapBuildCommitTxn
{
        //can not reach there
if (builder->state == SNAPBUILD_START ||
(builder->state == SNAPBUILD_BUILDING_SNAPSHOT &&
TransactionIdPrecedes(xid, SnapBuildNextPhaseAt(builder))))
}


 DecodeXactOp  {
if (SnapBuildCurrentState(builder) < SNAPBUILD_FULL_SNAPSHOT)
return;  //returned 
        }
}
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ifquant
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ifqu...@163.com
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