• Noel Grandin's avatar
    make the index costing sensitive to size of index · 1e48ee39
    Noel Grandin 提交于
    revamp the selection of indexes to move the bulk of the costing into
    BaseIndex.
    In the process, clean it up and modify the costing so that when using a
    covering index, we pick the index with the least number of columns.
    Smaller indexes are faster to load, leading to lower retrieval costs.
    1e48ee39
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