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// Test $minDistance option for $near and $nearSphere queries, and geoNear command. SERVER-9395.
(function() {
"use strict";
load("jstests/libs/geo_math.js");
var t = db.geo_mindistance;
t.drop();
const km = 1000;
/**
* Asserts that two numeric values are equal within some absolute error.
*/
function assertApproxEqual(rhs, lhs, error, msg) {
assert.lt(Math.abs(rhs - rhs), error, msg);
}
/**
* Count documents within some radius of (0, 0), in kilometers. With this function we can use
* the existing $maxDistance option to test the newer $minDistance option's behavior.
*/
function n_docs_within(radius_km) {
// geoNear's distances are in meters for geoJSON points.
var cmdResult = db.runCommand({
geoNear: t.getName(),
near: {type: 'Point', coordinates: [0, 0]},
spherical: true,
maxDistance: radius_km * km,
num: 1000
});
return cmdResult.results.length;
}
//
// Setup.
//
/**
* Make 121 points from long, lat = (0, 0) (in Gulf of Guinea) to (10, 10) (inland Nigeria).
*/
for (var x = 0; x <= 10; x += 1) {
for (var y = 0; y <= 10; y += 1) {
t.insert({loc: [x, y]});
}
}
t.ensureIndex({loc: "2dsphere"});
var n_docs = t.count(), geoJSONPoint = {type: 'Point', coordinates: [0, 0]},
legacyPoint = [0, 0];
//
// Test $near with GeoJSON point (required for $near with 2dsphere index). min/maxDistance are
// in meters.
//
var n_min1400_count =
t.find({loc: {$near: {$geometry: geoJSONPoint, $minDistance: 1400 * km}}}).count();
assert.eq(n_docs - n_docs_within(1400),
n_min1400_count,
"Expected " + (n_docs - n_docs_within(1400)) +
" points $near (0, 0) with $minDistance 1400 km, got " + n_min1400_count);
var n_bw500_and_1000_count =
t.find({
loc: {
$near:
{$geometry: geoJSONPoint, $minDistance: 500 * km, $maxDistance: 1000 * km}
}
}).count();
assert.eq(n_docs_within(1000) - n_docs_within(500),
n_bw500_and_1000_count,
"Expected " + (n_docs_within(1000) - n_docs_within(500)) +
" points $near (0, 0) with $minDistance 500 km and $maxDistance 1000 km, got " +
n_bw500_and_1000_count);
//
// $nearSphere with 2dsphere index can take a legacy or GeoJSON point. First test $nearSphere
// with legacy point. min/maxDistance are in radians.
//
n_min1400_count =
t.find({loc: {$nearSphere: legacyPoint, $minDistance: metersToRadians(1400 * km)}}).count();
assert.eq(n_docs - n_docs_within(1400),
n_min1400_count,
"Expected " + (n_docs - n_docs_within(1400)) +
" points $nearSphere (0, 0) with $minDistance 1400 km, got " + n_min1400_count);
n_bw500_and_1000_count = t.find({
loc: {
$nearSphere: legacyPoint,
$minDistance: metersToRadians(500 * km),
$maxDistance: metersToRadians(1000 * km)
}
}).count();
assert.eq(
n_docs_within(1000) - n_docs_within(500),
n_bw500_and_1000_count,
"Expected " + (n_docs_within(1000) - n_docs_within(500)) +
" points $nearSphere (0, 0) with $minDistance 500 km and $maxDistance 1000 km, got " +
n_bw500_and_1000_count);
//
// Test $nearSphere with GeoJSON point. min/maxDistance are in meters.
//
n_min1400_count = t.find({loc: {$nearSphere: geoJSONPoint, $minDistance: 1400 * km}}).count();
assert.eq(n_docs - n_docs_within(1400),
n_min1400_count,
"Expected " + (n_docs - n_docs_within(1400)) +
" points $nearSphere (0, 0) with $minDistance 1400 km, got " + n_min1400_count);
n_bw500_and_1000_count =
t.find({
loc: {$nearSphere: geoJSONPoint, $minDistance: 500 * km, $maxDistance: 1000 * km}
}).count();
assert.eq(
n_docs_within(1000) - n_docs_within(500),
n_bw500_and_1000_count,
"Expected " + (n_docs_within(1000) - n_docs_within(500)) +
" points $nearSphere (0, 0) with $minDistance 500 km and $maxDistance 1000 km, got " +
n_bw500_and_1000_count);
//
// Test geoNear command with GeoJSON point. Distances are in meters.
//
var cmdResult = db.runCommand({
geoNear: t.getName(),
near: {type: 'Point', coordinates: [0, 0]},
minDistance: 1400 * km,
spherical: true // spherical required for 2dsphere index
});
assert.eq(n_docs - n_docs_within(1400),
cmdResult.results.length,
"Expected " + (n_docs - n_docs_within(1400)) +
" points geoNear (0, 0) with $minDistance 1400 km, got " +
cmdResult.results.length);
cmdResult = db.runCommand({
geoNear: t.getName(),
near: {type: 'Point', coordinates: [0, 0]},
minDistance: 500 * km,
maxDistance: 1000 * km,
spherical: true
});
assert.eq(n_docs_within(1000) - n_docs_within(500),
cmdResult.results.length,
"Expected " + (n_docs_within(1000) - n_docs_within(500)) +
" points geoNear (0, 0) with $minDistance 500 km and $maxDistance 1000 km, got " +
cmdResult.results.length);
//
// Test geoNear command with legacy point. Distances are in radians.
//
cmdResult = db.runCommand({
geoNear: t.getName(),
near: legacyPoint,
minDistance: metersToRadians(1400 * km),
spherical: true // spherical required for 2dsphere index
});
assert.eq(n_docs - n_docs_within(1400),
cmdResult.results.length,
"Expected " + (n_docs - n_docs_within(1400)) +
" points geoNear (0, 0) with $minDistance 1400 km, got " +
cmdResult.results.length);
cmdResult = db.runCommand({
geoNear: t.getName(),
near: legacyPoint,
minDistance: metersToRadians(500 * km),
maxDistance: metersToRadians(1000 * km),
spherical: true
});
assert.eq(n_docs_within(1000) - n_docs_within(500),
cmdResult.results.length,
"Expected " + (n_docs_within(1000) - n_docs_within(500)) +
" points geoNear (0, 0) with $minDistance 500 km and $maxDistance 1000 km, got " +
cmdResult.results.length);
t.drop();
assert.commandWorked(t.createIndex({loc: "2d"}));
assert.writeOK(t.insert({loc: [0, 40]}));
assert.writeOK(t.insert({loc: [0, 41]}));
assert.writeOK(t.insert({loc: [0, 42]}));
// Test minDistance for 2d index with $near.
assert.eq(3, t.find({loc: {$near: [0, 0]}}).itcount());
assert.eq(1, t.find({loc: {$near: [0, 0], $minDistance: 41.5}}).itcount());
// Test minDistance for 2d index with $nearSphere. Distances are in radians.
assert.eq(3, t.find({loc: {$nearSphere: [0, 0]}}).itcount());
assert.eq(1, t.find({loc: {$nearSphere: [0, 0], $minDistance: deg2rad(41.5)}}).itcount());
// Test minDistance for 2d index with geoNear command and spherical=false.
cmdResult = db.runCommand({geoNear: t.getName(), near: [0, 0], spherical: false});
assert.commandWorked(cmdResult);
assert.eq(3, cmdResult.results.length);
assert.eq(40, cmdResult.results[0].dis);
assert.eq(41, cmdResult.results[1].dis);
assert.eq(42, cmdResult.results[2].dis);
cmdResult =
db.runCommand({geoNear: t.getName(), near: [0, 0], minDistance: 41.5, spherical: false});
assert.commandWorked(cmdResult);
assert.eq(1, cmdResult.results.length);
assert.eq(42, cmdResult.results[0].dis);
// Test minDistance for 2d index with geoNear command and spherical=true. Distances are in
// radians.
cmdResult = db.runCommand({geoNear: t.getName(), near: [0, 0], spherical: true});
assert.commandWorked(cmdResult);
assert.eq(3, cmdResult.results.length);
assertApproxEqual(deg2rad(40), cmdResult.results[0].dis, 1e-3);
assertApproxEqual(deg2rad(41), cmdResult.results[1].dis, 1e-3);
assertApproxEqual(deg2rad(42), cmdResult.results[2].dis, 1e-3);
cmdResult = db.runCommand(
{geoNear: t.getName(), near: [0, 0], minDistance: deg2rad(41.5), spherical: true});
assert.commandWorked(cmdResult);
assert.eq(1, cmdResult.results.length);
assertApproxEqual(deg2rad(42), cmdResult.results[0].dis, 1e-3);
}());
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