mongodb/jstests/core/oro.js

// @tags: [requires_getmore, requires_collstats]

// Test $or query with several clauses on separate indexes.

t = db.jstests_oro;
t.drop();

orClauses = [];
for (idxKey = 'a'; idxKey <= 'aaaaaaaaaa'; idxKey += 'a') {
    idx = {};
    idx[idxKey] = 1;
    t.ensureIndex(idx);
    for (i = 0; i < 200; ++i) {
        t.insert(idx);
    }
    orClauses.push(idx);
}

printjson(t.find({$or: orClauses}).explain());
c = t.find({$or: orClauses}).batchSize(100);
count = 0;

while (c.hasNext()) {
    for (i = 0; i < 50 && c.hasNext(); ++i, c.next(), ++count)
        ;
    // Interleave with another operation.
    t.stats();
}

assert.eq(10 * 200, count);