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// Tests that mapReduce preserves the indexes of the output collection, even when replacing it.
// @tags: [
// # mapReduce does not support afterClusterTime.
// does_not_support_causal_consistency,
// does_not_support_stepdowns,
// sbe_incompatible,
// uses_map_reduce_with_temp_collections,
// ]
(function() {
"use strict";
const coll = db.mr_preserve_indexes;
coll.drop();
const outName = "mr_preserve_indexes_out";
const out = db[outName];
out.drop();
assert.commandWorked(coll.insert([
{tags: [1]},
{tags: [1, 2]},
{tags: [1, 2, 3]},
{tags: [3]},
{tags: [2, 3]},
{tags: [2, 3]},
{tags: [1, 2]}
]));
const mapFn = function() {
for (let tag of this.tags)
emit(tag, 1);
};
const reduceFn = function(k, vs) {
return Array.sum(vs);
};
assert.commandWorked(coll.mapReduce(mapFn, reduceFn, {out: outName}));
assert.eq(1, out.getIndexes().length, () => tojson(out.getIndexes()));
assert.commandWorked(out.createIndex({value: 1}));
assert.eq(2, out.getIndexes().length, () => tojson(out.getIndexes()));
assert.commandWorked(coll.mapReduce(mapFn, reduceFn, {out: outName}));
assert.eq(2, out.getIndexes().length, () => tojson(out.getIndexes()));
}());
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