[SPARK-25493][SQL] Use auto-detection for CRLF in CSV datasource multiline mode (apache-spark-on-k8s#419)

Author: justinuang

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVOptions.scala

@@ -212,6 +212,8 @@ class CSVOptions(
     settings.setEmptyValue(emptyValueInRead)
     settings.setMaxCharsPerColumn(maxCharsPerColumn)
     settings.setUnescapedQuoteHandling(UnescapedQuoteHandling.STOP_AT_DELIMITER)
+    settings.setLineSeparatorDetectionEnabled(multiLine == true)
+
     settings
   }
 }

sql/core/src/test/resources/test-data/cars-crlf.csv

@@ -0,0 +1,7 @@
+
+year,make,model,comment,blank
+"2012","Tesla","S","No comment",
+
+1997,Ford,E350,"Go get one now they are going fast",
+2015,Chevy,Volt
+

sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/csv/CSVSuite.scala

@@ -52,6 +52,7 @@ class CSVSuite extends QueryTest with SharedSQLContext with SQLTestUtils with Te
   private val carsNullFile = "test-data/cars-null.csv"
   private val carsEmptyValueFile = "test-data/cars-empty-value.csv"
   private val carsBlankColName = "test-data/cars-blank-column-name.csv"
+  private val carsCrlf = "test-data/cars-crlf.csv"
   private val emptyFile = "test-data/empty.csv"
   private val commentsFile = "test-data/comments.csv"
   private val disableCommentsFile = "test-data/disable_comments.csv"
@@ -220,6 +221,17 @@ class CSVSuite extends QueryTest with SharedSQLContext with SQLTestUtils with Te
     }
   }
 
+  test("crlf line separators in multiline mode") {
+    val cars = spark
+      .read
+      .format("csv")
+      .option("multiLine", "true")
+      .option("header", "true")
+      .load(testFile(carsCrlf))
+
+    verifyCars(cars, withHeader = true)
+  }
+
   test("test aliases sep and encoding for delimiter and charset") {
     // scalastyle:off
     val cars = spark