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// @tags: [
// # Cannot implicitly shard accessed collections because of following errmsg: A single
// # update/delete on a sharded collection must contain an exact match on _id or contain the shard
// # key.
// assumes_unsharded_collection,
// # TODO SERVER-30466
// does_not_support_causal_consistency,
// ]
/**
* Tests running explain on a variety of explainable commands (find, update, remove, etc.) when
* there are multiple plans available. This is a regression test for SERVER-20849 and SERVER-21376.
*/
(function() {
"use strict";
var coll = db.explainMultiPlan;
coll.drop();
// Create indices to ensure there are multiple plans available.
assert.commandWorked(coll.createIndex({a: 1, b: 1}));
assert.commandWorked(coll.createIndex({a: 1, b: -1}));
// Insert some data to work with.
var bulk = coll.initializeOrderedBulkOp();
var nDocs = 100;
for (var i = 0; i < nDocs; ++i) {
bulk.insert({a: i, b: nDocs - i});
}
bulk.execute();
// SERVER-20849: The following commands should not crash the server.
assert.doesNotThrow(function() {
coll.explain("allPlansExecution").update({a: {$gte: 1}}, {$set: {x: 0}});
});
assert.doesNotThrow(function() {
coll.explain("allPlansExecution").remove({a: {$gte: 1}});
});
assert.doesNotThrow(function() {
coll.explain("allPlansExecution").findAndModify({query: {a: {$gte: 1}}, remove: true});
});
assert.doesNotThrow(function() {
coll.explain("allPlansExecution").findAndModify({query: {a: {$gte: 1}}, update: {y: 1}});
});
assert.doesNotThrow(function() {
coll.explain("allPlansExecution").find({a: {$gte: 1}}).finish();
});
assert.doesNotThrow(function() {
coll.explain("allPlansExecution").count({a: {$gte: 1}});
});
assert.doesNotThrow(function() {
coll.explain("allPlansExecution").distinct("a", {a: {$gte: 1}});
});
// SERVER-21376: Make sure the 'rejectedPlans' field is filled in appropriately.
function assertHasRejectedPlans(explainOutput) {
var queryPlannerOutput = explainOutput.queryPlanner;
// The 'rejectedPlans' section will be in a different place if passed through a mongos.
if ("SINGLE_SHARD" == queryPlannerOutput.winningPlan.stage) {
var shards = queryPlannerOutput.winningPlan.shards;
shards.forEach(function assertShardHasRejectedPlans(shard) {
assert.gt(shard.rejectedPlans.length, 0);
});
} else {
assert.gt(queryPlannerOutput.rejectedPlans.length, 0);
}
}
var res = coll.explain("queryPlanner").find({a: {$gte: 1}}).finish();
assert.commandWorked(res);
assertHasRejectedPlans(res);
res = coll.explain("executionStats").find({a: {$gte: 1}}).finish();
assert.commandWorked(res);
assertHasRejectedPlans(res);
}());
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