CASSANDRA-19590 If legacy cell is dropped, avoid creating a buffer cell #3283
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When the legacy data (2.2) satisfies a certain condition
Read in 3.0/3.11 for the corresponding table run into the assertion error
assert column.isComplex() == (path != null);in BufferCell.java because the column is a complex type while the cell is not a complex type.This patch tries to check whether the cell is dropped first. If dropped, skip the creation of the BufferCell.