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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: 1.22.1
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Component/s: Aggregation pipeline
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None
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Environment:node.js / npm versions: v12.12.0 / 6.13.4
OS: OS X 10.15.7
Java Driver : 4.0.5
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Iteration Uglifruit
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Not Needed
I've built a pipeline in Compass that uses a project phase with $reduce:
I have a project phase that also uses $reduce:
{
_id: 0,
title: '$playlist.songs.title',
artist: {
$reduce: {
input: '$playlist.songs.artists.name',
initialValue: "",
in: { $concat : ["$$value", " ", "$$this"] }
}
}
}
The pipeline executes fine in Compass and gives me back to documents I expect.
However, when I export to Java driver code, the code that is generated results in a runtime error in my application.
Here is the Java code that is generated is:
project(
fields(
excludeId(),
computed("title", "$playlist.songs.title"),
computed("artist",
eq("$reduce",
and(
eq("input", "$playlist.songs.artists.name"),
eq("initialValue", ""),
eq("in", eq("$concat", Arrays.asList("$$value", " ", "$$this"))))))))
And the error that is returned:
com.mongodb.MongoCommandException: Command failed with error 40076 (Location40076): '$reduce found an unknown argument: $and'
As some background, this was a pipeline I generated over a year ago (not sure the precise Compass version) and it worked fine with Java driver 3.x and Server 3.x. A few months ago the server was upgraded to 4.x, and the pipeline continued to run fine using Java driver 3.x.
It wasn't until I upgraded the Java driver to 4.x that this issue came up.
I have rebuilt the pipeline in the latest Compass version, and confirmed it still generates the same snippet of Java code that results in the error.
- depends on
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JAVA-3956 Add a helper method to the fluid API to create a document from other fluid method
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- Backlog
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- is duplicated by
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- Closed
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- is related to
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- Needs Triage
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- Closed
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- related to
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- Closed
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COMPASS-4695 Bring back builders in export to language for Java
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- Closed
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