Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/20648 Yup, +1 for starting this by disallowing but up to my knowledge R's read.csv allows then the legnth of tokens are shorter then its schema, putting nulls (or NA) into missing fields, as a valid case. I was thinking of disallowing the partial results but allowing the tokens less than the schema as a valid case in CSV. I need to double check R's read.csv behaviour and the current behaviour but it was roughly my thought.
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