Details
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Improvement
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Resolution: Unresolved
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Major - P3
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None
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None
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None
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Query Execution
Description
A small opportunity for optimization on queries using sparse indexes:
assert.commandWorked(db.c.insert({a: 1}));
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db.c.createIndex({a:1}, {sparse: true});
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db.c.explain().find({a: {$exists: true, $eq: null}});
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The bounds we get are:
{"a": ["[MinKey, MaxKey]"]}
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Since the query only searches for literal null, I believe we could use tighter bounds which only include null and undefined (something like [[null, null], [undefined, undefined]]