Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/14509
To the original issue here, `inferSchema` is CSV-specific option. I guess
we don't need this option for other sources because,
- we need anyway to read the same amount of data for JSON (entire scan),
Parquet (footer) and ORC (footer) regardless of `inferSchema`
- whereas CSV only reads the header when `inferSchema` is `false` and needs
an entire scan when `inferSchema` is `true`.
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