Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/5992#discussion_r33740745
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/SchemaUtils.scala
---
@@ -34,10 +34,11 @@ object SchemaUtils {
* @param colName column name
* @param dataType required column data type
*/
- def checkColumnType(schema: StructType, colName: String, dataType:
DataType): Unit = {
+ def checkColumnType(schema: StructType, colName: String, dataType:
DataType,
+ msg: String = ""): Unit = {
val actualDataType = schema(colName).dataType
require(actualDataType.equals(dataType),
- s"Column $colName must be of type $dataType but was actually
$actualDataType.")
+ s"Column $colName must be of type $dataType but was actually
$actualDataType.$msg")
--- End diff --
It might be easy to make the mistake of not added a space at the beginning.
Could you please modify msg to handle that? E.g.:
```
val message = if (msg.length > 0) " " + msg else ""
```
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