mongo/jstests/core/single_batch.js

22 lines
558 B
JavaScript

// Test the "single batch" semantics of negative limit.
(function() {
'use strict';
var coll = db.jstests_single_batch;
coll.drop();
// Approximately 1 MB.
var padding = new Array(1024 * 1024).join("x");
// Insert ~20 MB of data.
for (var i = 0; i < 20; i++) {
assert.commandWorked(coll.insert({_id: i, padding: padding}));
}
// The limit is 18, but we should end up with fewer documents since 18 docs won't fit in a
// single 16 MB batch.
var numResults = coll.find().limit(-18).itcount();
assert.lt(numResults, 18);
assert.gt(numResults, 0);
})();