48 lines
1.5 KiB
JavaScript
48 lines
1.5 KiB
JavaScript
/**
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* Tests for explaining the delete command.
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*
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* @tags: [
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* no_selinux,
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* requires_fastcount,
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* requires_fcv_61,
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* requires_non_retryable_writes,
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* # Pre-images requires doc-by-doc deletion and this test relies on BATCHED_DELETE
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* incompatible_with_preimages_by_default,
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* ]
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*/
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import {checkNWouldDelete} from "jstests/libs/query/analyze_plan.js";
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let collName = "jstests_explain_delete";
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let t = db[collName];
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t.drop();
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let explain;
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// Explain delete against an empty collection.
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assert.commandWorked(db.createCollection(t.getName()));
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explain = db.runCommand({explain: {delete: collName, deletes: [{q: {a: 1}, limit: 0}]}});
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checkNWouldDelete(explain, 0);
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// Add an index but no data, and check that the explain still works.
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t.createIndex({a: 1});
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explain = db.runCommand({explain: {delete: collName, deletes: [{q: {a: 1}, limit: 0}]}});
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checkNWouldDelete(explain, 0);
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// Add some copies of the same document.
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for (let i = 0; i < 10; i++) {
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t.insert({a: 1});
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}
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assert.eq(10, t.count());
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// Run an explain which shows that all 10 documents *would* be deleted.
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explain = db.runCommand({explain: {delete: collName, deletes: [{q: {a: 1}, limit: 0}]}});
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checkNWouldDelete(explain, 10);
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// Make sure all 10 documents are still there.
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assert.eq(10, t.count());
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// If we run the same thing without the explain, then all 10 docs should be deleted.
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let deleteResult = db.runCommand({delete: collName, deletes: [{q: {a: 1}, limit: 0}]});
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assert.commandWorked(deleteResult);
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assert.eq(0, t.count());
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