Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16961#discussion_r101597873
--- Diff:
examples/src/main/java/org/apache/spark/examples/sql/JavaSQLDataSourceExample.java
---
@@ -139,11 +139,9 @@ private static void
runBasicParquetExample(SparkSession spark) {
// Parquet files can also be used to create a temporary view and then
used in SQL statements
parquetFileDF.createOrReplaceTempView("parquetFile");
Dataset<Row> namesDF = spark.sql("SELECT name FROM parquetFile WHERE
age BETWEEN 13 AND 19");
- Dataset<String> namesDS = namesDF.map(new MapFunction<Row, String>() {
- public String call(Row row) {
- return "Name: " + row.getString(0);
- }
- }, Encoders.STRING());
+ Dataset<String> namesDS = namesDF.map(
+ (MapFunction<Row, String>) row -> "Name: " + row.getString(0),
--- End diff --
For those wondering why this lambda has to be cast, it's because it is
otherwise ambiguous, as there are two methods with an eligible function
interface as arg.
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