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https://issues.apache.org/jira/browse/FLINK-37969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arvid Heise resolved FLINK-37969.
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Fix Version/s: 2.1.0
Resolution: Fixed
Merged into master as 4f424c7.
> Allow Transformation subgraphs to be merged during translation
> --------------------------------------------------------------
>
> Key: FLINK-37969
> URL: https://issues.apache.org/jira/browse/FLINK-37969
> Project: Flink
> Issue Type: Improvement
> Components: API / Core
> Affects Versions: 2.1.0
> Reporter: Arvid Heise
> Assignee: Arvid Heise
> Priority: Major
> Fix For: 2.1.0
>
>
> Transformations are immutable by design and thus planner or DataStream API
> need to generate a subgraph in one pass. However, there are some use cases
> where we would attach some small subgraph to a larger subgraph before
> translation into a StreamGraph. For example, system views in SQL may actually
> refer to specific parts of the query where we would like to add a subgraph to
> a side-output.
> This ticket is about providing a mechanism to later rewire transformations
> during translation without losing the immutability of transformations.
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