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https://issues.apache.org/jira/browse/BEAM-2819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795607#comment-16795607
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Kenneth Knowles commented on BEAM-2819:
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[~chamikara] FYI
> Key only reads from Google Datastore
> ------------------------------------
>
> Key: BEAM-2819
> URL: https://issues.apache.org/jira/browse/BEAM-2819
> Project: Beam
> Issue Type: New Feature
> Components: io-java-gcp
> Reporter: Ilnar Taichinov
> Priority: Major
> Labels: datastore, triaged
>
> 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.
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