jstests/core/ord.js


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// check that we don't crash if an index used by an earlier or clause is dropped

// Dropping an index kills all cursors on the indexed namespace, not just those
// cursors using the dropped index.  This test is to serve as a reminder that
// the $or implementation may need minor adjustments (memory ownership) if this
// behavior is changed.

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

t.ensureIndex({a: 1});
t.ensureIndex({b: 1});

for (i = 0; i < 80; ++i) {
    t.save({a: 1});
}

for (i = 0; i < 100; ++i) {
    t.save({b: 1});
}

c = t.find({$or: [{a: 1}, {b: 1}]}).batchSize(100);
for (i = 0; i < 90; ++i) {
    c.next();
}
// At this point, our initial query has ended and there is a client cursor waiting
// to read additional documents from index {b:1}.  Deduping is performed against
// the index key {a:1}.

t.dropIndex({a: 1});

// Dropping an index kills all cursors on the indexed namespace, not just those
// cursors using the dropped index.
assert.throws(c.next());