Revert "SERVER-40755 Expose statistics which indicate how many collection scans have executed"

This reverts commit a4ef14ef41f0700ef07e5b57b0345d2396a44604.

1 files changed, 0 insertions, 83 deletions

diff --git a/jstests/aggregation/sources/collStats/query_exec_stats.js b/jstests/aggregation/sources/collStats/query_exec_stats.js
deleted file mode 100644
index 920f3ed84a6..00000000000
--- a/jstests/aggregation/sources/collStats/query_exec_stats.js
+++ /dev/null
@@ -1,83 +0,0 @@
-// Test that queryExecStats within a $collStats stage returns the correct execution stats.
-// @tags: [assumes_no_implicit_collection_creation_after_drop]
-(function() {
-    "use strict";
-
-    if (jsTest.options().storageEngine === "mobile") {
-        print("Skipping test because storage engine isn't mobile");
-        return;
-    }
-
-    load("jstests/aggregation/extras/utils.js");  // For "assertErrorCode".
-    load("jstests/libs/fixture_helpers.js");      // For "FixtureHelpers".
-
-    const nDocs = 32;
-
-    const testDB = db.getSiblingDB("aggregation_query_exec_stats");
-    const coll = testDB.aggregation_query_exec_stats;
-    coll.drop();
-    assert.commandWorked(
-        testDB.createCollection("aggregation_query_exec_stats", {capped: true, size: nDocs * 100}));
-
-    for (let i = 0; i < nDocs; i++) {
-        assert.commandWorked(coll.insert({a: i}));
-    }
-
-    // Run a bunch of collection scans on the server.
-    for (let i = 0; i < nDocs; i++) {
-        assert.eq(coll.find({a: i}).itcount(), 1);
-    }
-
-    // Test that an error is returned if queryExecStats is not an object.
-    let pipeline = [{$collStats: {queryExecStats: 1}}];
-    assertErrorCode(coll, pipeline, 31141, "queryExecStats spec must be an object");
-    pipeline = [{$collStats: {queryExecStats: "1"}}];
-    assertErrorCode(coll, pipeline, 31141, "queryExecStats spec must be an object");
-
-    // Test the accuracy of the result of queryExecStats as a standalone option.
-    pipeline = [{$collStats: {queryExecStats: {}}}];
-    let result = coll.aggregate(pipeline).next();
-    assert.eq(nDocs, result.queryExecStats.collectionScans.total);
-    assert.eq(nDocs, result.queryExecStats.collectionScans.nonTailable);
-
-    // Test tailable collection scans update collectionScans counters appropriately.
-    for (let i = 0; i < nDocs; i++) {
-        assert.eq(coll.find({a: i}).tailable().itcount(), 1);
-    }
-    result = coll.aggregate(pipeline).next();
-    assert.eq(nDocs * 2, result.queryExecStats.collectionScans.total);
-    assert.eq(nDocs, result.queryExecStats.collectionScans.nonTailable);
-
-    // Run a query which will require the client to fetch multiple batches from the server. Ensure
-    // that the getMore commands don't increment the counter of collection scans.
-    assert.eq(coll.find({}).batchSize(2).itcount(), nDocs);
-    result = coll.aggregate(pipeline).next();
-    assert.eq((nDocs * 2) + 1, result.queryExecStats.collectionScans.total);
-    assert.eq(nDocs + 1, result.queryExecStats.collectionScans.nonTailable);
-
-    // Create index to test that index scans don't up the collection scan counter.
-    assert.commandWorked(coll.createIndex({a: 1}));
-    // Run a bunch of index scans.
-    for (let i = 0; i < nDocs; i++) {
-        assert.eq(coll.find({a: i}).itcount(), 1);
-    }
-    result = coll.aggregate(pipeline).next();
-    // Assert that the number of collection scans hasn't increased.
-    assert.eq((nDocs * 2) + 1, result.queryExecStats.collectionScans.total);
-    assert.eq(nDocs + 1, result.queryExecStats.collectionScans.nonTailable);
-
-    // Test that we error when the collection does not exist.
-    coll.drop();
-    pipeline = [{$collStats: {queryExecStats: {}}}];
-    assertErrorCode(coll, pipeline, 31142);
-
-    // Test that we error when the database does not exist.
-    // TODO SERVER-33039 When running against a mongos, a non-existent database will cause all
-    // aggregations to return an empty result set.
-    assert.commandWorked(testDB.dropDatabase());
-    if (FixtureHelpers.isMongos(testDB)) {
-        assert.eq([], coll.aggregate(pipeline).toArray());
-    } else {
-        assertErrorCode(coll, pipeline, 31142);
-    }
-}());