Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/11034#issuecomment-180506306
Changes to this PR:
1. Add a HashMap batchToMetadata to store the metadata in memory so that we
don't need to read metadata files in `getNextBatch`
2. Load metadata files and handle corrupted metadata files when finding
metadata files in the constructor
3. Only text format doesn't require a schema when there are no existing
files. For other cases, it will throw `IllegalArgumentException`.
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