Add timestamp handling to checkpoint writer #340
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Description
Add handling for the timestamp type to the checkpoint writer.
Within JSON log files, timestamps are stored as an ISO8601 string. In checkpoint files, they are stored with a physical type of int64 and a logical type describing precision, etc..
This PR deserializes the JSON string stored in stats min and max values and converts it to nanoseconds to match the delta-rs schema mapping.
Related
delta-io/kafka-delta-ingest#44