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https://issues.apache.org/jira/browse/BEAM-6241?focusedWorklogId=538533&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-538533
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ASF GitHub Bot logged work on BEAM-6241:
----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Jan/21 16:24
Start Date: 20/Jan/21 16:24
Worklog Time Spent: 10m
Work Description: matthieucham commented on pull request #7293:
URL: https://github.com/apache/beam/pull/7293#issuecomment-763758511
Hey guys, sorry to bother you, I don't know if it's the right place but I
have some issues with what as been commited in this PR: It seems to me that
multiple stages AggregationQuery pipelines are not correctly handled, because
of this method:
```java
public MongoCursor<Document> apply(@UnknownKeyFor @NonNull @Initialized
MongoCollection<Document> collection) {
if (this.bucket() != null) {
if (this.mongoDbPipeline().size() == 1) {
this.mongoDbPipeline().add(this.bucket());
} else {
this.mongoDbPipeline().set(this.mongoDbPipeline().size() -
1, this.bucket());
}
}
return collection.aggregate(this.mongoDbPipeline()).iterator();
}
```
The .set(...) looks very odd to me as it replaces the last stage of the
pipeline, I don't get how that could be correct ? (Note that I'm new to MongoDB
so maybe that explains...)
Moreover, I wanted to test and override this by providing my own QueryFn,
but it appears in MongoDBIO implementation that this function will be
force-casted to either FilterQuery or AggregationQuery. Shouldn't we be able to
provide any function as long as the contract is respected ?
Hopefully, you're still reading this thread. Please point me to the right
place if I should post this comment elsewhere
Thanks
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Issue Time Tracking
-------------------
Worklog Id: (was: 538533)
Time Spent: 7h 40m (was: 7.5h)
> Add support for aggregates using withQueryFn to MongoDbIO
> ---------------------------------------------------------
>
> Key: BEAM-6241
> URL: https://issues.apache.org/jira/browse/BEAM-6241
> Project: Beam
> Issue Type: Improvement
> Components: io-java-mongodb
> Affects Versions: 2.9.0
> Reporter: Ahmed El.Hussaini
> Assignee: Ahmed El.Hussaini
> Priority: P2
> Labels: easyfix
> Fix For: 2.12.0
>
> Time Spent: 7h 40m
> Remaining Estimate: 0h
>
> h2. Adds Support to Limit Results
>
> {code:java}
> MongoDbIO.read()
> .withUri("mongodb://localhost:" + port)
> .withDatabase(DATABASE)
> .withCollection(COLLECTION)
> .withFilter("{\"scientist\":\"Einstein\"}")
> .withLimit(5));{code}
> h2. Adds Support to Use Aggregates
>
> {code:java}
> List<BsonDocument> aggregates = new ArrayList<BsonDocument>();
> aggregates.add(
> new BsonDocument(
> "$match",
> new BsonDocument("country", new BsonDocument("$eq", new
> BsonString("England")))));
> PCollection<Document> output =
> pipeline.apply(
> MongoDbIO.read()
> .withUri("mongodb://localhost:" + port)
> .withDatabase(DATABASE)
> .withCollection(COLLECTION)
> .withAggregate(aggregates));
> {code}
>
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