Thomas Mueller created OAK-439:
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Summary: Query: if a result limit is set, avoid reading all rows
in memory to sort
Key: OAK-439
URL: https://issues.apache.org/jira/browse/OAK-439
Project: Jackrabbit Oak
Issue Type: Bug
Reporter: Thomas Mueller
Assignee: Thomas Mueller
Priority: Minor
Queries that use "order by" currently load all nodes in memory. Having to read
all data in memory can be avoided if the index used returns the data in sorted
order (currently not implemented), but in some cases, for example if there is
no such index, the data needs to be read. In many cases this isn't actually a
problem. However, if the result is large, it is a problem.
To limit the memory usage, instead of reading all data in memory, only a number
of nodes could be read, then sorted, the result truncated, more data read,
sorted, and so on.
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