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Type:
Task
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Resolution: Unresolved
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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None
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Query Optimization
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We should model the JavaScript dependency. If DepsTracker had needJsEnv, or something more general like needRandomGenerator, that could prevent this incorrect rewrite.
[
{$lookup: {
from: "ns",
pipeline: [{$set: {time1: {$function: {
body: function () {
var now = Date.now();
while (Date.now() === now) {}
return new Date(now);
},
args: [], lang: "js",
}}}}],
as: "result",
}},
{$set: {time2: {$function: {
body: function () { return new Date(); },
args: [], lang: "js"
}}}},
]
In the above example, the two $function blocks always read a different time, and time1 < time2.
If the $set is hoisted before the $lookup, time2 < time1.
- is related to
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SERVER-105449 Pushdown of $match past a computed field
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- In Code Review
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- related to
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SERVER-124097 $function computed field may be rewritten incorrectly
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- Needs Scheduling
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