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https://issues.apache.org/jira/browse/FLINK-19912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-19912:
-----------------------------------
Labels: pull-request-available (was: )
> JSON format fails to serialize map value with null keys
> -------------------------------------------------------
>
> Key: FLINK-19912
> URL: https://issues.apache.org/jira/browse/FLINK-19912
> Project: Flink
> Issue Type: Improvement
> Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile)
> Affects Versions: 1.12.0
> Reporter: hailong wang
> Assignee: hailong wang
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> When JsonRowDataSerializationSchema serializing map data with null keys, it
> will throw NPE.
> As discussed following, we propose to introduce format options to solve this
> problem.
> {{json.map-null-key.mode}} controls the handling mode when encountering null
> keys for map data.
> - {{FAIL}} (default): throws exception
> - {{DROP}}: drop null key entries
> - {{LITERAL}}: serialize null keys as string literal which is determined by
> {{json.map-null-key.literal}} option.
> The default value of {{json.map-null-key.literal}} is "null".
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