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// Test basic query stage collection scan functionality.
t = db.stages_collection_scan;
t.drop();
var collname = "stages_collection_scan";
var N = 50;
for (var i = 0; i < N; ++i) {
t.insert({foo: i});
}
forward = {cscan: {args: {direction: 1}}};
res = db.runCommand({stageDebug: {collection: collname, plan: forward}});
assert.eq(res.ok, 1);
assert.eq(res.results.length, N);
assert.eq(res.results[0].foo, 0);
assert.eq(res.results[49].foo, 49);
// And, backwards.
backward = {cscan: {args: {direction: -1}}};
res = db.runCommand({stageDebug: {collection: collname, plan: backward}});
assert.eq(res.ok, 1);
assert.eq(res.results.length, N);
assert.eq(res.results[0].foo, 49);
assert.eq(res.results[49].foo, 0);
forwardFiltered = {cscan: {args: {direction: 1},
filter: {foo: {$lt: 25}}}};
res = db.runCommand({stageDebug: {collection: collname, plan: forwardFiltered}});
assert.eq(res.ok, 1);
assert.eq(res.results.length, 25);
assert.eq(res.results[0].foo, 0);
assert.eq(res.results[24].foo, 24);
backwardFiltered = {cscan: {args: {direction: -1},
filter: {foo: {$lt: 25}}}};
res = db.runCommand({stageDebug: {collection: collname, plan: backwardFiltered}});
assert.eq(res.ok, 1);
assert.eq(res.results.length, 25);
assert.eq(res.results[0].foo, 24);
assert.eq(res.results[24].foo, 0);
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