Github user wangyum commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22513#discussion_r219388085
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/execution/benchmark/FilterPushdownBenchmark.scala
 ---
    @@ -27,7 +27,7 @@ import 
org.apache.spark.sql.functions.monotonically_increasing_id
     import org.apache.spark.sql.internal.SQLConf
     import org.apache.spark.sql.internal.SQLConf.ParquetOutputTimestampType
     import org.apache.spark.sql.types.{ByteType, Decimal, DecimalType, 
TimestampType}
    -import org.apache.spark.util.{Benchmark, BenchmarkBase => 
FileBenchmarkBase, Utils}
    +import org.apache.spark.util.Utils
     
     /**
      * Benchmark to measure read performance with Filter pushdown.
    --- End diff --
    
    How about change scala doc to below to fix **fails to generate 
documentation**?
    ```scala
     * To run this benchmark:
     * {{{
     *   1. without sbt: bin/spark-submit --class <this class> <spark sql test 
jar>
     *   2. build/sbt "sql/test:runMain <this class>"
     *   3. generate result: SPARK_GENERATE_BENCHMARK_FILES=1 build/sbt 
"sql/test:runMain <this class>"
     *      Results will be written to 
"benchmarks/FilterPushdownBenchmark-results.txt".
     * }}}
    ```
    fails to generate documentation error message:
    ```java
    
/home/jenkins/workspace/SparkPullRequestBuilder@2/target/javaunidoc/org/apache/spark/mllib/linalg/UDTSerializationBenchmark.html...
    [error] 
/home/jenkins/workspace/SparkPullRequestBuilder@2/mllib/target/java/org/apache/spark/mllib/linalg/UDTSerializationBenchmark.java:5:
 error: unknown tag: this
    [error]  * 1. without sbt: bin/spark-submit --class <this class> <spark 
mllib test jar>
    [error]                                             ^
    [error] 
/home/jenkins/workspace/SparkPullRequestBuilder@2/mllib/target/java/org/apache/spark/mllib/linalg/UDTSerializationBenchmark.java:5:
 error: unknown tag: spark
    [error]  * 1. without sbt: bin/spark-submit --class <this class> <spark 
mllib test jar>
    [error]                                                          ^
    [error] 
/home/jenkins/workspace/SparkPullRequestBuilder@2/mllib/target/java/org/apache/spark/mllib/linalg/UDTSerializationBenchmark.java:6:
 error: unknown tag: this
    [error]  * 2. build/sbt "mllib/test:runMain <this class>"
    [error]                                     ^
    [error] 
/home/jenkins/workspace/SparkPullRequestBuilder@2/mllib/target/java/org/apache/spark/mllib/linalg/UDTSerializationBenchmark.java:7:
 error: unknown tag: this
    [error]  * 3. generate result: SPARK_GENERATE_BENCHMARK_FILES=1 build/sbt 
"mllib/test:runMain <this class>"
    [error] 
    ```


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