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This commit closes issue #3698, at least for now, since the root cause
was not fixed: the bounding box function, for huge radiuses, does not
return a correct bounding box, there are points still within the radius
that are left outside.
So when using GEORADIUS queries with radiuses in the order of 5000 km or
more, it was possible to see, at the edge of the area, certain points
not correctly reported.
Because the bounding box for now was used just as an optimization, and
such huge radiuses are not common, for now the optimization is just
switched off when the radius is near such magnitude.
Three test cases found by the Continuous Integration test were added, so
that we can easily trigger the bug again, both for regression testing
and in order to properly fix it as some point in the future.
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A bug was reported in the context in issue #3631. The root cause of the
bug was that certain neighbor boxes were zeroed after the "inside the
bounding box or not" check, simply because the bounding box computation
function was wrong.
A few debugging infos where enhanced and moved in other parts of the
code. A check to avoid steps=0 was added, but is unrelated to this
issue and I did not verified it was an actual bug in practice.
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By grepping the continuous integration errors log a number of GEORADIUS
tests failures were detected.
Fortunately when a GEORADIUS failure happens, the test suite logs enough
information in order to reproduce the problem: the PRNG seed,
coordinates and radius of the query.
By reproducing the issues, three different bugs were discovered and
fixed in this commit. This commit also improves the already good
reporting of the fuzzer and adds the failure vectors as regression
tests.
The issues found:
1. We need larger squares around the poles in order to cover the area
requested by the user. There were already checks in order to use a
smaller step (larger squares) but the limit set (+/- 67 degrees) is not
enough in certain edge cases, so 66 is used now.
2. Even near the equator, when the search area center is very near the
edge of the square, the north, south, west or ovest square may not be
able to fully cover the specified radius. Now a test is performed at the
edge of the initial guessed search area, and larger squares are used in
case the test fails.
3. Because of rounding errors between Redis and Tcl, sometimes the test
signaled false positives. This is now addressed.
Whenever possible the original code was improved a bit in other ways. A
debugging example stanza was added in order to make the next debugging
session simpler when the next bug is found.
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The function removed also had potential bugs related to signess of the
expression, and is not used anyway.
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Without the right feature macros M_PI is not defined in math.h.
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They were under /deps since they originate from a different source tree,
however at this point they are very modified and we took ownership of
both the files making changes, fixing bugs, so there is no upgrade path
from the original code tree.
Given that, better to move the code under /src with proper dependencies
and with a more simpler editing experience.
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