Hi All I've just started reading about Cassandra and writing simple tests using Cassandra 0.6.5 to see if we can use it for our product.
I have a data store with a set of columns, like C1, C2, C3, and C4, but the columns aren't mandatory. For example, there can be a list of (k.v) pairs with only C1 and C2, but no C3 and C4. At the same time, there can be a set of records with all the columns present. It's possible to consider them as three sets A (with all columns), B (with C1 and C2) and C (with C3 and C4). And I'm trying to find out the following: 1. A - B (all records who don't have C3 and C4) and A - C (all record who don't have C1 and C2) 2. records for whom C2 != C4 It's possible to pick all records and do this processing in my client code - but that won't perform well. Is there any way to do these within Cassandra? For example, by passing a list of column names so that cassandra returns the records with only those columns? Regards Arijit
