text: /**
   * Tests the pipeline-style update is accepted by the findAndModify command.
   * @tags: [requires_non_retryable_writes]
   */
  (function() {
  "use strict";
  
  load("jstests/libs/fixture_helpers.js");  // For isMongos.
  load("jstests/libs/analyze_plan.js");     // For planHasStage().
  
  const coll = db.find_and_modify_pipeline_update;
  coll.drop();
  
  // Test that it generally works.
  assert.commandWorked(coll.insert([{_id: 0}, {_id: 1}, {_id: 2}, {_id: 3}, {_id: 4}]));
  let found = coll.findAndModify({query: {_id: 0}, update: [{$set: {y: 1}}]});
  assert.eq(found, {_id: 0});
  found = coll.findAndModify({query: {_id: 0}, update: [{$set: {z: 2}}], new: true});
  assert.eq(found, {_id: 0, y: 1, z: 2});
  
  found = coll.findAndModify({query: {_id: 0}, update: [{$unset: ["z"]}], new: true});
  assert.eq(found, {_id: 0, y: 1});
  
  // Test that pipeline-style update supports the 'fields' argument.
  assert(coll.drop());
  assert.commandWorked(coll.insert([{_id: 0, x: 0}, {_id: 1, x: 1}, {_id: 2, x: 2}, {_id: 3, x: 3}]));
  found = coll.findAndModify({query: {_id: 0}, update: [{$set: {y: 0}}], fields: {x: 0}});
  assert.eq(found, {_id: 0});
  
  found = coll.findAndModify({query: {_id: 1}, update: [{$set: {y: 1}}], fields: {x: 1}});
  assert.eq(found, {_id: 1, x: 1});
  
  found = coll.findAndModify({query: {_id: 2}, update: [{$set: {y: 2}}], fields: {x: 0}, new: true});
  assert.eq(found, {_id: 2, y: 2});
  
  found = coll.findAndModify({query: {_id: 3}, update: [{$set: {y: 3}}], fields: {x: 1}, new: true});
  assert.eq(found, {_id: 3, x: 3});
  
  //
  // Tests for explain using findAndModify with an _id equality query.
  //
  {
      let explain =
          coll.explain("queryPlanner").findAndModify({query: {_id: 3}, update: [{$set: {y: 999}}]});
      assert(planHasStage(db, explain.queryPlanner.winningPlan, "IDHACK"));
      assert(planHasStage(db, explain.queryPlanner.winningPlan, "UPDATE"));
  
      // Run explain with execution-level verbosity.
      explain =
          coll.explain("executionStats").findAndModify({query: {_id: 3}, update: [{$set: {y: 999}}]});
      assert.eq(explain.executionStats.nReturned, 1);
      // UPDATE stage would modify one document.
      const updateStage = getPlanStage(explain.executionStats.executionStages, "UPDATE");
      assert.eq(updateStage.nWouldModify, 1);
  
      // Check that no write was performed.
      assert.eq(coll.find({y: 999}).count(), 0);
  }
  
  // We skip the following tests for sharded fixtures as it will fail as the query when
  // findAndModify doesn't contain the shard key.
  if (!FixtureHelpers.isMongos(db)) {
      //
      // Tests for explain with a query that requires a COLLSCAN.
      //
      let explain =
          coll.explain("queryPlanner").findAndModify({query: {y: 3}, update: [{$set: {y: 999}}]});
      assert(planHasStage(db, explain.queryPlanner.winningPlan, "COLLSCAN"));
      assert(planHasStage(db, explain.queryPlanner.winningPlan, "UPDATE"));
  
      // Run explain with execution-level verbosity.
      explain =
          coll.explain("executionStats").findAndModify({query: {y: 3}, update: [{$set: {y: 999}}]});
      assert.eq(explain.executionStats.nReturned, 1);
      // UPDATE stage would modify one document.
      const updateStage = getPlanStage(explain.executionStats.executionStages, "UPDATE");
      assert.eq(updateStage.nWouldModify, 1);
  
      // Check that no write was performed.
      assert.eq(coll.find({y: 999}).count(), 0);
  
      //
      // Test that 'sort' works with pipeline-style update.
      //
      assert(coll.drop());
      assert.commandWorked(
          coll.insert([{_id: 0, x: 'b'}, {_id: 1, x: 'd'}, {_id: 2, x: 'a'}, {_id: 3, x: 'c'}]));
      found = coll.findAndModify({update: [{$set: {foo: "bar"}}], sort: {x: -1}, new: true});
      assert.eq(found, {_id: 1, x: 'd', foo: "bar"});
  }
  
  // Test that it rejects the combination of arrayFilters and a pipeline-style update.
  let err =
      assert.throws(() => coll.findAndModify(
                        {query: {_id: 1}, update: [{$set: {y: 1}}], arrayFilters: [{"i.x": 4}]}));
  assert.eq(err.code, ErrorCodes.FailedToParse);
  }());
  