Ruidong Li created FLINK-9958:
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Summary: Fix potential NPE for delta iteration of DataSet
Key: FLINK-9958
URL: https://issues.apache.org/jira/browse/FLINK-9958
Project: Flink
Issue Type: Bug
Components: DataSet API
Reporter: Ruidong Li
Assignee: Ruidong Li-- This message was sent by Atlassian JIRA (v7.6.3#76005)
