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In Redis MULTIWORDCOMMANDNAME are mapped to functions where the command
name is all lowercase: multiwordcommandnameCommand().
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The GIS standard and all the major DBs implementing GIS related
functions take coordinates as x,y that is longitude,latitude.
It was a bad start for Redis to do things differently, so even if this
means that existing users of the Geo module will be required to change
their code, Redis now conforms to the standard.
Usually Redis is very backward compatible, but this is not an exception
to this rule, since this is the first Geo implementation entering the
official Redis source code. It is not wise to try to be backward
compatible with code forks... :-)
Close #2637.
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This commit simplifies the implementation in a few ways:
1. zsetScore implementation improved a bit and moved into t_zset.c where
is now also used to implement the ZSCORE command.
2. Range extraction from the sorted set remains a separated
implementation from the one in t_zset.c, but was hyper-specialized in
order to avoid accumulating results into a list and remove the ones
outside the radius.
3. A new type is introduced: geoArray, which can accumulate geoPoint
structures in a vector with power of two expansion policy. This is
useful since we have to call qsort() against it before returning the
result to the user.
4. As a result of 1, 2, 3, the two files zset.c and zset.h are now
removed, including the function to merge two lists (now handled with
functions that can add elements to existing geoArray arrays) and
the machinery used in order to pass zset results.
5. geoPoint structure simplified because of the general code structure
simplification, so we no longer need to take references to objects.
6. Not counting the JSON removal the refactoring removes 200 lines of
code for the same functionalities, with a simpler to read
implementation.
7. GEORADIUS is now 2.5 times faster testing with 10k elements and a
radius resulting in 124 elements returned. However this is mostly a
side effect of the refactoring and simplification. More speed gains
can be achieved by trying to optimize the code.
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The command can only return data in the normal Redis protocol. It is up
to the caller to translate to JSON if needed.
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Current todo:
- replace functions in zset.{c,h} with a new unified Redis
zset access API.
Once we get the zset interface fixed, we can squash
relevant commits in this branch and have one nice commit
to merge into unstable.
This commit adds:
- Geo commands
- Tests; runnable with: ./runtest --single unit/geo
- Geo helpers in deps/geohash-int/
- src/geo.{c,h} and src/geojson.{c,h} implementing geo commands
- Updated build configurations to get everything working
- TEMPORARY: src/zset.{c,h} implementing zset score and zset
range reading without writing to client output buffers.
- Modified linkage of one t_zset.c function for use in zset.c
Conflicts:
src/Makefile
src/redis.c
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