mirror of https://github.com/mongodb/mongo
102 lines
2.8 KiB
JavaScript
102 lines
2.8 KiB
JavaScript
// @tags: [requires_fcv_44]
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t = db.distinct_array1;
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t.drop();
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t.save({a: [1, 2, 3]});
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t.save({a: [2, 3, 4]});
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t.save({a: [3, 4, 5]});
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t.save({a: 9});
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// Without index.
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res = t.distinct("a").sort();
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assert.eq("1,2,3,4,5,9", res.toString());
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// Array element 0 without index.
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res = t.distinct("a.0").sort();
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assert.eq("1,2,3", res.toString());
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// Array element 1 without index.
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res = t.distinct("a.1").sort();
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assert.eq("2,3,4", res.toString());
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// With index.
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t.ensureIndex({a: 1});
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res = t.distinct("a").sort();
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assert.eq("1,2,3,4,5,9", res.toString());
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// Array element 0 with index.
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res = t.distinct("a.0").sort();
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assert.eq("1,2,3", res.toString());
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// Array element 1 with index.
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res = t.distinct("a.1").sort();
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assert.eq("2,3,4", res.toString());
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t.save({a: [{b: "a"}, {b: "d"}], c: 12});
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t.save({a: [{b: "b"}, {b: "d"}], c: 12});
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t.save({a: [{b: "c"}, {b: "e"}], c: 12});
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t.save({a: [{b: "c"}, {b: "f"}], c: 12});
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t.save({a: [], c: 12});
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t.save({a: {b: "z"}, c: 12});
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// Without index.
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res = t.distinct("a.b").sort();
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assert.eq("a,b,c,d,e,f,z", res.toString());
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// Array element 0 without index
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res = t.distinct("a.0.b").sort();
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assert.eq("a,b,c", res.toString());
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// Array element 1 without index
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res = t.distinct("a.1.b").sort();
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assert.eq("d,e,f", res.toString());
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// With index.
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t.ensureIndex({"a.b": 1});
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res = t.distinct("a.b");
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res.sort();
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// TODO SERVER-14832 The presence of an index may change results, but only if the index is not
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// multikey.
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// In a sharded scenario, an unlucky distribution of data will cause all the arrays to go to one
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// shard, and one shard be left with only non-multikey documents, including one with {a: 9}, which
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// will generate a null result.
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if (res.includes(null)) {
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// The default sorting of an array is by string, so null will appear in an odd position.
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assert.eq(res, ["a", "b", "c", "d", "e", "f", null, "z"]);
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} else {
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assert.eq("a,b,c,d,e,f,z", res.toString());
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}
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// _id as an document containing an array
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t.save({_id: {a: [1, 2, 3]}});
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t.save({_id: {a: [2, 3, 4]}});
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t.save({_id: {a: [3, 4, 5]}});
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t.save({_id: {a: 9}});
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// Without index.
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res = t.distinct("_id.a").sort();
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assert.eq("1,2,3,4,5,9", res.toString());
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// Array element 0 without index.
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res = t.distinct("_id.a.0").sort();
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assert.eq("1,2,3", res.toString());
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// Array element 1 without index.
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res = t.distinct("_id.a.1").sort();
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assert.eq("2,3,4", res.toString());
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// With index.
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t.ensureIndex({"_id.a": 1});
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res = t.distinct("_id.a").sort();
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// TODO SERVER-14832: distinct() may incorrectly return null in presence of index.
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assert.eq([1, 2, 3, 4, 5, 9, null], res);
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// Array element 0 with index.
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res = t.distinct("_id.a.0").sort();
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assert.eq("1,2,3", res.toString());
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// Array element 1 with index.
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res = t.distinct("_id.a.1").sort();
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assert.eq("2,3,4", res.toString());
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