Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21657#discussion_r202528372
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/UnivocityParser.scala
---
@@ -223,8 +234,8 @@ class UnivocityParser(
} else {
try {
var i = 0
- while (i < schema.length) {
- row(i) = valueConverters(i).apply(tokens(i))
+ while (i < requiredSchema.length) {
--- End diff --
Add the comment like
> // When the length of the returned tokens is identical to the length of
the parsed schema, we just need to convert the tokens that correspond to the
required columns.
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