Greetings,

I have been looking through the code and I can't find any place where
columns are removed from an sstable.   I have found that rows can be
deleted.  Columns can be marked as deleted.  But I have found no place
where the deleted cell is removed from the row.  Is there the concept of
completely removing all traces of the column from the table?

The specific case I am working on is downgrading v4.x system.local table to
v3.1 format.  This involves the removal of the broadcast_port column so
that the hardcoded definition of the v3.1 table can read the sstable from
disk.

Any assistance or pointers would be appreciated,
Claude

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