HyukjinKwon commented on issue #23323: [SPARK-26372][SQL] Don't reuse value 
from previous row when parsing bad CSV input field
URL: https://github.com/apache/spark/pull/23323#issuecomment-447621229
 
 
   Ah, hm. NVM. We don't produce partial records during conversion (string to 
appropriate typed value in a row) in branch-2.4. If we failed to parse because 
of the different length of tokens, we will explicitly set `null` for them. So, 
I don't think the same thing happens in lower Spark versions.

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