Polishing.

Reformat code.

See #1666
Original pull request: #1667

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/IdGeneratingBatchInsertStrategy.java

@@ -93,8 +93,7 @@ class IdGeneratingBatchInsertStrategy implements BatchInsertStrategy {
 
 	private String[] getKeyColumnNames(IdGeneration idGeneration) {
 
-		return Optional.ofNullable(idColumn)
+		return Optional.ofNullable(idColumn).map(idColumn -> new String[] { idGeneration.getKeyColumnName(idColumn) })
-				.map(idColumn -> new String[] {idGeneration.getKeyColumnName( idColumn) })
 				.orElse(new String[0]);
 	}
 }