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  1. HPCC
  2. HPCC-15101

Add a hint to a filter to indicate how likely it is to remove a row

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    • Compatibility:
      Major

      Description

      Currently if a spill file is filtered and used by multiple other subgraphs, the code generator assumes that the filter is expensive, and therefore generates a diskread, filter, disk write.

      Often this assumption is not correct - the test is inexpensive and removes few records so it would be better to read the entire file and filter it each time.

      Needs more thought on the exact names of options/hints to use.

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              • Assignee:
                shamser Shamser Ahmed
                Reporter:
                ghalliday Gavin Halliday
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                • Created:
                  Updated:
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