taegeonum opened a new pull request #120: [NEMO-217] Immediately emits elements in FlattenTransform URL: https://github.com/apache/incubator-nemo/pull/120 JIRA: [NEMO-217: Immediately emits elements in FlattenTransform](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-217) **Major changes:** - remove `ArrayList` that collects elements in `FlattenTransform` and directly emit the elements **Minor changes to note:** - **Tests for the changes:** - **Other comments:** - Closes #GITHUB_PR_NUMBER
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