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  1. IMPALA
  2. IMPALA-9317

Improve number of instances estimate for scans in planner

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      Currently the number of instances (used for various estimates) is calculated as estimated # hosts * mt_dop. This is suboptimal, because in many cases there isn't enough input data to allow creating that many instances per host.

      The per-host estimate for scans actually already handles this correctly by capping the hosts estimate at the number of input splits - we should use the same approach for number of instance estimates.

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            tarmstrong Tim Armstrong
            tarmstrong Tim Armstrong
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