SERVER-10026 fetch limit skip or

1 files changed, 34 insertions, 0 deletions

diff --git a/jstests/stages_limit_skip.js b/jstests/stages_limit_skip.js
new file mode 100644
index 00000000000..9441e4cd65b
--- /dev/null
+++ b/jstests/stages_limit_skip.js
@@ -0,0 +1,34 @@
+// Test limit and skip
+t = db.stages_limit_skip;
+t.drop();
+
+var N = 50;
+for (var i = 0; i < N; ++i) {
+    t.insert({foo: i, bar: N - i, baz: i});
+}
+
+t.ensureIndex({foo: 1})
+
+// foo <= 20, decreasing
+// Limit of 5 results.
+ixscan1 = {ixscan: {args:{name: "stages_limit_skip", keyPattern:{foo: 1},
+                          startKey: {"": 20},
+                          endKey: {}, endKeyInclusive: true,
+                          direction: -1}}};
+limit1 = {limit: {args: {node: ixscan1, num: 5}}}
+res = db.runCommand({stageDebug: limit1});
+assert(!db.getLastError());
+assert.eq(res.ok, 1);
+assert.eq(res.results.length, 5);
+assert.eq(res.results[0].foo, 20);
+assert.eq(res.results[4].foo, 16);
+
+// foo <= 20, decreasing
+// Skip 5 results.
+skip1 = {skip: {args: {node: ixscan1, num: 5}}}
+res = db.runCommand({stageDebug: skip1});
+assert(!db.getLastError());
+assert.eq(res.ok, 1);
+assert.eq(res.results.length, 16);
+assert.eq(res.results[0].foo, 15);
+assert.eq(res.results[res.results.length - 1].foo, 0);