Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11262#discussion_r53578002
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala ---
@@ -345,6 +346,46 @@ class DataFrameReader private[sql](sqlContext:
SQLContext) extends Logging {
}
/**
+ * Loads a CSV file and returns the result as a [[DataFrame]].
+ *
+ * This function goes through the input once to determine the input
schema. If you know the
+ * schema in advance, use the version that specifies the schema to avoid
the extra scan.
--- End diff --
"If you know the schema in advance, use the version that specifies the
schema to avoid the extra scan."
There is no version that does that. Maybe just say "To avoid going through
the entire data once, specify the schema explicitly using [[schema]]."
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