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From "Vikas Kedigehalli (JIRA)" <>
Subject [jira] [Commented] (BEAM-1956) Flatten operation should respect input type hints.
Date Thu, 13 Apr 2017 00:11:41 GMT


Vikas Kedigehalli commented on BEAM-1956:

cc [~lcwik] [~robertwb] []

> Flatten operation should respect input type hints.
> --------------------------------------------------
>                 Key: BEAM-1956
>                 URL:
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py
>            Reporter: Vikas Kedigehalli
>            Assignee: Vikas Kedigehalli
>             Fix For: First stable release
> Input type hints are currently not respected by the Flatten operation and instead `Any`
type is chosen as a fallback. This could lead to using a pickle coder even if there was a
custom coder type hint provided for input PCollections. 
> Also, this could lead to undesirable results, particularly, when a Flatten operation
is followed by a GroupByKey operation which requires the key coder to be deterministic. Even
if the user provides deterministic coder type hints to their PCollections, defaulting to Any
would result in using the pickle coder (non-deterministic). As a result of this, CoGroupByKey
is broken in such scenarios where input PCollection coder is deterministic for the type while
pickle coder is not.   

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