public static interface JsonRecordReader.Handler
record - The record map. The key is the field name as provided in
the addField() methods. The value can be a single String (for single
valued fields) or a List<String> (for multiValued).
This map is mutable. DO NOT alter the map or store it for later use.
If it must be stored, make a deep copy before doing so
path - The forEach path for which this record is being emitted
If there is any change all parsing will be aborted and the Exception
is propagated up
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