include partition column in error message

Author: gengliangwang

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

@@ -284,7 +284,8 @@ object PartitioningUtils {
         val columnValue = columnValueLiteral.eval()
         val castedValue = Cast(columnValueLiteral, dataType, Option(timeZone.getID)).eval()
         if (validatePartitionColumns && columnValue != null && castedValue == null) {
-          throw new RuntimeException(s"Failed to cast partition value `$columnValue` to $dataType")
+          throw new RuntimeException(s"Failed to cast value `$columnValue` to `$dataType` " +
+            s"for partition column `$columnName`")
         }
         Literal.create(castedValue, userSpecifiedDataTypes(columnName))
       } else {

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

@@ -108,7 +108,7 @@ class FileIndexSuite extends SharedSQLContext {
         val msg = intercept[RuntimeException] {
           fileIndex.partitionSpec()
         }.getMessage
-        assert(msg == "Failed to cast partition value `foo` to IntegerType")
+        assert(msg == "Failed to cast value `foo` to `IntegerType` for partition column `a`")
       }
 
       withSQLConf(SQLConf.VALIDATE_PARTITION_COLUMNS.key -> "false") {