[mdb-dev] NULL column support

[Brian B. <ca...@um...>]

Hi all,
 
I've added support for null columns to data.c  It's still preliminary and   
needs a better way to pass the information back up to the utilities 
(currently it copys a zero length string when binding during the call to 
mdb_fetch_row()).
 
The way it works is this:  At the end of each data row there is a bitmask of
1 byte per 8 columns.  Each bit indicates the presence of a data value for  
that column (1 indicates value present, 0 indicates a NULL).  Column 1 is 
the low order bit in the first byte. So for a 12 column table with nulls in 
columns 6 and 12 the bitmask would be 0xbf07 (extra bits are 0'd).

After making sure mdb-export is returning the proper number of rows, I'd
like to make a new release (0.1 I guess), unless there are any objections. 

Brian