[GitHub] [beam] kennknowles opened a new issue, #18423: Key only reads from Google Datastore

[GitBox <gi...@apache.org>]

kennknowles opened a new issue, #18423:
URL: https://github.com/apache/beam/issues/18423

   Currently there is no functionality allowing to read only keys from the Google Datastore through the Datastore IO. In some cases users don't need to read the whole entity, e.g. to filter by certain values in ancestry. This seems to be an important feature as the entity reads are expensive and thus the native Datastore client/API allow to run Key Only queries. 
   
   Imported from Jira [BEAM-2819](https://issues.apache.org/jira/browse/BEAM-2819). Original Jira may contain additional context.
   Reported by: ilnar.


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Re: [I] Key only reads from Google Datastore [beam]

["sosimon (via GitHub)" <gi...@apache.org>]

sosimon commented on issue #18423:
URL: https://github.com/apache/beam/issues/18423#issuecomment-1897537691

   This may or may not be applicable for Java, but for the Python SDK, I believe we can specify `projection = ["__key__"]` to do a keys-only query. It's not really documented though.
   
   Relevant bit of code: https://github.com/googleapis/python-datastore/blob/main/google/cloud/datastore/query.py#L463-L465


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