SliceMap() not returning exact Cassandra table data, copies previous row values when column value is nil

Hi,

I encountered a problem when executing gocql iter.SliceMap for TimeStamp based columns. For the rows having columns with null values in Cassandra, SliceMap returning result set by copying previous row's column value. I observed this for TimeStamp based column types, not sure about other column types. I'm not getting this issue with iter.MapScan(). Anybody please help..

Start by reproducing the issue through iter.SliceMap with Cassandra rows containing nil timestamp values, then compare its results with iter.MapScan. Investigate why SliceMap copies a previous row's value; done when nil columns retain their correct values and the behavior is covered by a regression test.

Written by the indexing model from the issue text.