[BEAM-3346] Add projections to MongoDb IO

• Type: New Feature
• Status: Resolved
• Priority: P2
• Resolution: Duplicate
• Affects Version/s: 2.3.0
• Fix Version/s: 2.10.0
• Component/s: io-java-mongodb
• Labels: I/O Java MongoDB
• Assignee: Unassigned
• Reporter: Michael Kosten
• Created: 13/Dec/17 22:47
• Updated: 16/May/20 13:51
• Resolved: 09/Jan/19 11:04

Description

The db.collection.find operation for MongoDb allows for the filter parameter, but not for the projection parameter. This would be extremely helpful for retrieving only a portion of fat documents. Looking over the current java code for MongoDbIO, this looks pretty straightforward.

I think the best approach would be to add a String withProjection method to the builder, similar to the withFilter method, then parse this to Bson and then append it to the find method with .projection(fields(projectionBson)).

Issue Links

• is related to: BEAM-6134 MongoDbIO add support for projection