[jira] [Created] (FLINK-19165) Clean up the UnilateralSortMerger

[Shang Yuanchun (Jira)]

Dawid Wysakowicz created FLINK-19165:
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             Summary: Clean up the UnilateralSortMerger
                 Key: FLINK-19165
                 URL: https://issues.apache.org/jira/browse/FLINK-19165
             Project: Flink
          Issue Type: Bug
          Components: API / Core
            Reporter: Dawid Wysakowicz
            Assignee: Dawid Wysakowicz
             Fix For: 1.12.0


This is a preparation step for [FLIP-140|https://cwiki.apache.org/confluence/display/FLINK/FLIP-140%3A+Introduce+bounded+style+execution+for+keyed+streams]. The purpose of the task is two-folds:
* break down the implementation into a more composable pieces
* introduce a way to produce records in a push-based manner instead of pull-based with additional reading thread.



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