Thomas Mueller created OAK-6391:
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Summary: With FastQuerySize, getSize() returns -1 if there are
exactly 21 rows
Key: OAK-6391
URL: https://issues.apache.org/jira/browse/OAK-6391
Project: Jackrabbit Oak
Issue Type: Bug
Components: query
Reporter: Thomas Mueller
Assignee: Thomas Mueller
Priority: Critical
Fix For: 1.8
If FastQuerySize is enabled, and the query result has exactly 21 rows, then
getSize() returns -1. With 20 or 22 rows, the correct value is returned.
Comment:
One can not assume getSize() _always_ returns a value larger than 0. Sometimes,
getSize() returns too many, it could also return too few; it is just an
estimate. The loop used to read the rows should _only_ have "it.hasNext() && i
< maxCount" as a condition. With maxCount for example 30. If the number of rows
read is smaller than 30, then that's the real row count. If it's 30, then you
can use getSize() as an estimation. That can still be -1 for "unknown", even
with FastQuerySize enabled.
But it's true that -1 is unexpected in this case.
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