jstests/sharding/wildcard_index_banned_for_shard_key.js


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//
// Confirms that a wildcard index cannot be used to support a shard key.
//

(function() {
    'use strict';

    const st = new ShardingTest({mongos: 1, shards: 2});
    const kDbName = 'wildcard_index_banned_for_shard_key';
    const mongos = st.s0;

    function assertCannotShardCollectionOnWildcardIndex(keyDoc) {
        assert.commandWorked(mongos.adminCommand({enableSharding: kDbName}));

        assert.commandFailedWithCode(
            mongos.adminCommand({shardCollection: `${kDbName}.foo`, key: keyDoc}),
            ErrorCodes.InvalidOptions);

        assert.eq(mongos.getDB('config').collections.count({_id: `${kDbName}.foo`}), 0);
        assert.commandWorked(mongos.getDB(kDbName).dropDatabase());
    }

    // Can't shard on a path supported by a general wildcard index.
    assert.commandWorked(mongos.getDB(kDbName).foo.createIndex({"$**": 1}));
    assert.commandWorked(mongos.getDB(kDbName).foo.insert({a: 1}));
    assertCannotShardCollectionOnWildcardIndex({a: 1});

    // Can't shard on a path supported by a targeted wildcard index.
    assert.commandWorked(mongos.getDB(kDbName).foo.createIndex({"a.$**": 1}));
    assert.commandWorked(mongos.getDB(kDbName).foo.insert({a: 1}));
    assertCannotShardCollectionOnWildcardIndex({a: 1});

    // Can't shard on a path supported by wildcard index with projection option.
    assert.commandWorked(
        mongos.getDB(kDbName).foo.createIndex({"$**": 1}, {wildcardProjection: {a: 1}}));
    assert.commandWorked(mongos.getDB(kDbName).foo.insert({a: 1}));
    assertCannotShardCollectionOnWildcardIndex({a: 1});

    st.stop();
})();