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Add the index recommender API #510
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What is the context for this pull request?
This PR introduces an API for Hyperspace index recommender. Specific implementations will be introduced in later PR's.
What changes were proposed in this pull request?
The index recommender takes as input a workload, and returns a collection of indexes as well as their impact on the estimated execution cost of the workload.
Does this PR introduce any user-facing change?
No
How was this patch tested?
It is just an interface without any implementation. We will introduce concrete index recommenders in follow-up PR's and test them thoroughly.