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I am relatively new to columnar database, please forgive ignorance. Lets say I have 1,000,000 columns. I would like to return a random sample of 10% of those columns (ie c0, c10, c20…c999,980, c999,990)
In HBase they have column filters, I could write a column filter that returned every tenth result. Can I do this in Pycassa/Cassanda?
Thank you
The only thing you can do server side is slices. So you can read starting at column=C10 limit=10 to get columns 10-19. Or you can ask for specific columns, so you could ask for every 10th column manually if you knew how many columns there were.