Github user MaxGekk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21657#discussion_r200204856
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/UnivocityParser.scala
---
@@ -197,15 +203,21 @@ class UnivocityParser(
*/
def parse(input: String): InternalRow = doParse(input)
+ private val getToken = if (options.columnPruning) {
+ (tokens: Array[String], index: Int) => tokens(index)
+ } else {
+ (tokens: Array[String], index: Int) => tokens(tokenIndexArr(index))
--- End diff --
The `lazy` for `tokenIndexArr` means that internal laziness flag will be
check per each token. I would remove `lazy` for `tokenIndexArr`
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