97 lines
4.2 KiB
JavaScript
97 lines
4.2 KiB
JavaScript
/**
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* Test aggregation explain of $merge and $out pipelines.
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*
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* The $out stage is not allowed with a sharded output collection. Explain of $out or $merge does
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* not accept writeConcern.
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* @tags: [assumes_unsharded_collection, assumes_write_concern_unchanged]
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*/
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(function() {
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"use strict";
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load("jstests/libs/fixture_helpers.js"); // For FixtureHelpers.isMongos().
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load("jstests/libs/analyze_plan.js"); // For getAggPlanStage().
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load("jstests/aggregation/extras/out_helpers.js"); // For withEachOutMode().
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let sourceColl = db.explain_writing_aggs_source;
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let targetColl = db.explain_writing_aggs_target;
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sourceColl.drop();
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targetColl.drop();
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assert.writeOK(sourceColl.insert({_id: 1}));
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// Test that $out can be explained with 'queryPlanner' explain verbosity and does not perform
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// any writes.
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let explain = sourceColl.explain("queryPlanner").aggregate([{$out: targetColl.getName()}]);
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let outExplain = getAggPlanStage(explain, "$out");
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assert.neq(outExplain, null, explain);
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// TODO SERVER-40432 $out serialization should never use the 'mode: "replaceCollection"'.
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assert.eq(outExplain.$out.to, targetColl.getName(), explain);
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assert.eq(targetColl.find().itcount(), 0, explain);
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// Test each $merge mode with 'queryPlanner' explain verbosity.
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withEachMergeMode(function({whenMatchedMode, whenNotMatchedMode}) {
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const mergeStage = {
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$merge: {
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into: targetColl.getName(),
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whenMatched: whenMatchedMode,
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whenNotMatched: whenNotMatchedMode
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}
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};
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const explain = sourceColl.explain("queryPlanner").aggregate([mergeStage]);
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const mergeExplain = getAggPlanStage(explain, "$merge");
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assert.neq(mergeExplain, null, explain);
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assert(mergeExplain.hasOwnProperty("$merge"), explain);
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assert.eq(mergeExplain.$merge.whenMatched, whenMatchedMode, mergeExplain);
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assert.eq(mergeExplain.$merge.whenNotMatched, whenNotMatchedMode, mergeExplain);
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assert.eq(mergeExplain.$merge.on, "_id", mergeExplain);
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assert.eq(targetColl.find().itcount(), 0, explain);
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});
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function assertExecutionExplainFails(writingStage, verbosity) {
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assert.commandFailedWithCode(db.runCommand({
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explain: {aggregate: sourceColl.getName(), pipeline: [writingStage], cursor: {}},
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verbosity: verbosity
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}),
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[51029, 51184]);
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assert.eq(targetColl.find().itcount(), 0);
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}
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// Test that 'executionStats' and 'allPlansExec' level explain fail with each $merge mode. These
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// explain modes must fail, since they would attempt to do writes. Explain must always be
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// read-only (including explain of update and delete, which describe what writes they _would_ do
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// if exected for real).
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withEachMergeMode(function({whenMatchedMode, whenNotMatchedMode}) {
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const mergeStage = {
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$merge: {
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into: targetColl.getName(),
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whenMatched: whenMatchedMode,
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whenNotMatched: whenNotMatchedMode
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}
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};
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assertExecutionExplainFails(mergeStage, "executionStats");
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assertExecutionExplainFails(mergeStage, "allPlansExecution");
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});
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// Also test the $out stage since it also performs writes.
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assertExecutionExplainFails({$out: targetColl.getName()}, "executionStats");
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assertExecutionExplainFails({$out: targetColl.getName()}, "allPlansExecution");
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// Execution explain should fail even if the source collection does not exist.
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sourceColl.drop();
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withEachMergeMode(function({whenMatchedMode, whenNotMatchedMode}) {
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const mergeStage = {
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$merge: {
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into: targetColl.getName(),
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whenMatched: whenMatchedMode,
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whenNotMatched: whenNotMatchedMode
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}
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};
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assertExecutionExplainFails(mergeStage, "executionStats");
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assertExecutionExplainFails(mergeStage, "allPlansExecution");
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});
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// Also test the $out stage since it also performs writes.
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assertExecutionExplainFails({$out: targetColl.getName()}, "executionStats");
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assertExecutionExplainFails({$out: targetColl.getName()}, "allPlansExecution");
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}());
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