feat(dynamodb): Use ProjectionExpression when requested_features is set#6366
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Friendly ping @franciscojavierarceo -- this has been open ~10 days. Let me know if anything needs adjusting. |
ntkathole
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The requested_features parameter was accepted by online_read and online_read_async but never used -- DynamoDB always fetched all features stored in the values map regardless. Add a ProjectionExpression to BatchGetItem requests when requested_features is provided, reducing data transfer, latency, and read costs. Fixes feast-dev#6058 Signed-off-by: Jonathan Wrede <wrede.jonathan00@gmail.com>
The return dict contains both str and Dict[str, str] values, so the return type must be Dict[str, Any] not Dict[str, str]. Signed-off-by: Jonathan Wrede <wrede.jonathan00@gmail.com>
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Summary
online_readandonline_read_asyncacceptrequested_featuresbut ignored it -- DynamoDB always fetched all features from thevaluesmapProjectionExpressiontoBatchGetItemrequests whenrequested_featuresis provided, so DynamoDB only returnsentity_id,event_ts, and the requested feature attributes withinvaluesExpressionAttributeNamesto avoid conflicts with DynamoDB reserved wordsFixes
Fixes #6058
Test plan
test_build_projection_expression-- verifies correct DynamoDB expression generationtest_build_projection_expression_none-- verifies None/empty returns Nonetest_dynamodb_online_store_online_read_with_requested_features-- verifies only requested features are returned (moto)test_dynamodb_online_store_online_read_without_requested_features-- verifies all features returned when not specified (moto)test_dynamodb_online_store_online_read_requested_features_parallel-- verifies filtering across parallel batches (moto)