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Posted to oak-issues@jackrabbit.apache.org by "Alex Parvulescu (JIRA)" <ji...@apache.org> on 2013/11/08 09:35:18 UTC

[jira] [Created] (OAK-1155) PropertyIndex cost calculation is faulty

Alex Parvulescu created OAK-1155:
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             Summary: PropertyIndex cost calculation is faulty
                 Key: OAK-1155
                 URL: https://issues.apache.org/jira/browse/OAK-1155
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: core, query
            Reporter: Alex Parvulescu


The cost calculation can easily go out of bounds when it needs to estimate (whenever there are more than 100 nodes).
The high value it returns can be higher than the traversal index which has a max of 10M, but can be less smaller.


For example:
  100 nodes in the index:
  with a single level /content cost is 6250000
  adding a second level /content/data cost jumps to 1.544804416E9

  101 nodes in the index:
  with a single level /content cost is 100
  adding a second level /content/data stays at 100

  100 nodes, 12 levels deep, cost is 2.147483647E9
  101 nodes, 12 levels deep, cost is 6.7108864E7



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