On 6/13/2011 9:25 AM, Stephen Connolly wrote:
On 13 June 2011 16:14, AJ<a...@dude.podzone.net> wrote:
On 6/13/2011 7:03 AM, Stephen Connolly wrote:
It returns the set of columns for the set of rows... how do you
determine the difference between a completely empty row and a row that
just does not have any of the matching columns?
I would expect it to not return anything (no row at all) for both of those
cases. Are you saying that an empty row is returned for rows that do not
match the predicate? So, if I perform a range slice where the range is
every row of the CF and the slice equates to no matches and I have 1 million
rows in the CF, then I will get a result set of 1 million empty rows?
No I am saying that for each row that matches, you will get a result,
even if the columns that you request happen to be empty for that
specific row.
Ok, this I understand I guess. If I query a range of rows and want only
a certain column and a row does not have that column, I would like to
know that.
Likewise, any deleted rows in the same row range will show as empty
because C* would have a tone of work to figure out the difference
between being deleted and being empty.
But, if a row does indeed have the column, but that row was deleted, why
would I get an empty row? You say because of a ton of work. So, the
tombstone for the row is not stored "close-by" for quick access... or
something like that? At any rate, how do I figure out if the empty row
is empty because it was deleted? Sorry if I'm being dense.
