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3e8795494e
To produce a streamed_mutation for the next partition, we need to read its key and the tombstone. Currently we always do that by consuming the partition header from the data file. In some cases that may cause unnecessary IO. It's better to obtain partition information from the index if we already have it. We can save on IO if the user will skip past the front of partition immediately after. It is also better to pay the cost of reading the index if we know that we will need to use the index anyway soon. This patch predicts that by checking if there are any clustering restrictions. If there are any, we will almost surely need_skip() and use the index anyway. This change also lays the ground for unification of multi and single partiton queries without loss of performance.