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Fix GEOHASH last character: always output '0' for Redis compatibility #1635

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Fix GEOHASH last character: always output '0' for Redis compatibility #1635

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1545037
Initial plan
Copilot Mar 17, 2026
4c55847
Fix GEOHASH last character to always return '0' for Redis compatibility
Copilot Mar 17, 2026
f52707b
Revert global.json SDK version change
Copilot Apr 1, 2026
e7af1d5
Merge branch 'main' into copilot/fix-geohash-last-character
badrishc Apr 7, 2026
040fc19
Refactor GetGeoHashCode per PaulusParssinen's suggestion
Copilot Apr 7, 2026
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6 changes: 5 additions & 1 deletion libs/server/Objects/SortedSetGeo/GeoHash.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -237,7 +237,11 @@ public static string GetGeoHashCode(long hash)
{
var base32Chars = "0123456789bcdefghjkmnpqrstuvwxyz"u8;

for (var i = 0; i < chars.Length; i++)
// We have just 52 bits, but the API outputs an 11-character geohash (55 bits).
// For compatibility with Redis, the last character is always '0'.
chars[^1] = '0';

for (var i = 0; i < chars.Length - 1; i++)
{
// Shift and mask the five most significant bits for index to the base-32 table.
chars[i] = (char)base32Chars[(int)(hash >> (BitsOfPrecision - 5)) & 0x1F];
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17 changes: 9 additions & 8 deletions test/Garnet.test/GeoHashTests.cs
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Expand Up @@ -42,15 +42,15 @@ public void CanEncodeAndDecodeCoordinates(double latitude, double longitude)
}

[Test]
[TestCase(30.5388942218, 104.0555758833, 4024744861876082, "wm3vxz6vywh")]
[TestCase(27.988056, 86.925278, 3636631039000829, "tuvz4p141z8")]
[TestCase(30.5388942218, 104.0555758833, 4024744861876082, "wm3vxz6vyw0")]
[TestCase(27.988056, 86.925278, 3636631039000829, "tuvz4p141z0")]
[TestCase(37.502669, 15.087269, 3476216502357864, "sqdtr74hyu0")]
[TestCase(38.115556, 13.361389, 3476004292229755, "sqc8b49rnys")]
[TestCase(38.918250, -77.427944, 1787100258949719, "dqbvqhfenps")]
[TestCase(38.115556, 13.361389, 3476004292229755, "sqc8b49rny0")]
[TestCase(38.918250, -77.427944, 1787100258949719, "dqbvqhfenp0")]
[TestCase(0.0, 0.0, 0xC000000000000, "s0000000000")]
[TestCase(-90.0, -180.0, 0, "00000000000")]
[TestCase(90.0, 180.0, 0xFFFFFFFFFFFFF, "zzzzzzzzzzs")]
[TestCase(89.99999999999999, 179.99999999999997, 0xFFFFFFFFFFFFF, "zzzzzzzzzzs")]
[TestCase(90.0, 180.0, 0xFFFFFFFFFFFFF, "zzzzzzzzzz0")]
[TestCase(89.99999999999999, 179.99999999999997, 0xFFFFFFFFFFFFF, "zzzzzzzzzz0")]
public void CanEncodeAndDecodeCoordinatesWithGeoHashCode(
double latitude,
double longitude,
Expand All @@ -62,8 +62,9 @@ public void CanEncodeAndDecodeCoordinatesWithGeoHashCode(

ClassicAssert.AreEqual(expectedHashInteger, hashInteger);

// Note: while we are comparing the entire textual representation of geohash (11 characters)
// we are comparing in 52-bit precision, not 55-bit that is expected from GeoHash standard.
// Note: while we are comparing the entire textual representation of geohash (11 characters),
// the data is stored in 52-bit precision (not 55-bit as required by the GeoHash standard).
// For compatibility with Redis, the last character is always '0'.
ClassicAssert.AreEqual(expectedHash, hash);
}
}
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8 changes: 4 additions & 4 deletions test/Garnet.test/RespSortedSetGeoTests.cs
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Expand Up @@ -221,7 +221,7 @@ public void CanUseGeoPos()

var responseHash = db.GeoHash(new RedisKey("SecondKey"), ["Palermo"]);
ClassicAssert.AreEqual(1, responseHash.Length);
ClassicAssert.AreEqual("sqc8b49rnys", responseHash[0]);
ClassicAssert.AreEqual("sqc8b49rny0", responseHash[0]);

memresponse = db.Execute("MEMORY", "USAGE", "SecondKey");
actualValue = ResultType.Integer == memresponse.Resp2Type ? Int32.Parse(memresponse.ToString()) : -1;
Expand Down Expand Up @@ -590,16 +590,16 @@ public void CanUseGeoHash(int bytesSent)
var response = lightClientRequest.Execute("GEOADD Sicily 13.361389 38.115556 Palermo 15.087269 37.502669 Catania", "PING", expectedResponse.Length, bytesSent);
ClassicAssert.AreEqual(expectedResponse, response);

expectedResponse = "*3\r\n$11\r\nsqc8b49rnys\r\n$11\r\nsqdtr74hyu0\r\n$-1\r\n+PONG\r\n";
expectedResponse = "*3\r\n$11\r\nsqc8b49rny0\r\n$11\r\nsqdtr74hyu0\r\n$-1\r\n+PONG\r\n";
response = lightClientRequest.Execute("GEOHASH Sicily Palermo Catania Unknown", "PING", expectedResponse.Length, bytesSent);
ClassicAssert.AreEqual(expectedResponse, response);

expectedResponse = "*3\r\n$11\r\nsqc8b49rnys\r\n$11\r\nsqdtr74hyu0\r\n$-1\r\n";
expectedResponse = "*3\r\n$11\r\nsqc8b49rny0\r\n$11\r\nsqdtr74hyu0\r\n$-1\r\n";
response = lightClientRequest.Execute("GEOHASH Sicily Palermo Catania Unknown", expectedResponse.Length, bytesSent);
ClassicAssert.AreEqual(expectedResponse, response);

// Execute command in chunks
expectedResponse = "*1\r\n$11\r\nsqc8b49rnys\r\n";
expectedResponse = "*1\r\n$11\r\nsqc8b49rny0\r\n";
response = lightClientRequest.Execute("GEOHASH Sicily Palermo", expectedResponse.Length, bytesSent);
ClassicAssert.AreEqual(expectedResponse, response);
}
Expand Down