Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21631
As I described in
https://github.com/apache/spark/pull/21625#discussion_r197679077, I found
another bug? (the case where
`spark.sql.csv.parser.columnPruning.enabled=false`) when working on this pr;
```
./bin/spark-shell --conf spark.sql.csv.parser.columnPruning.enabled=false
scala> val dir = "/tmp/spark-csv/csv"
scala> spark.range(10).selectExpr("id % 2 AS p",
"id").write.mode("overwrite").partitionBy("p").csv(dir)
scala> spark.read.csv(dir).selectExpr("sum(p)").collect()
18/06/25 13:48:46 ERROR Executor: Exception in task 2.0 in stage 2.0 (TID 7)
java.lang.ClassCastException: org.apache.spark.unsafe.types.UTF8String
cannot be cast to java.lang.Integer
at scala.runtime.BoxesRunTime.unboxToInt(BoxesRunTime.java:101)
at
org.apache.spark.sql.catalyst.expressions.BaseGenericInternalRow$class.getInt(rows.scala:41)
...
```
I worked on this fix and made a patch to fix this;
https://github.com/apache/spark/compare/master...maropu:SPARK-24645-2
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