[SPARK-25487][SQL][TEST] Refactor PrimitiveArrayBenchmark

[seancxmao]

What changes were proposed in this pull request?

Refactor PrimitiveArrayBenchmark to use main method and print the output as a separate file.

Run blow command to generate benchmark results:

SPARK_GENERATE_BENCHMARK_FILES=1 build/sbt "sql/test:runMain org.apache.spark.sql.execution.benchmark.PrimitiveArrayBenchmark"

How was this patch tested?

Manual tests.

[wangyum]

LGTM

[SparkQA]

Test build #96365 has finished for PR 22497 at commit 631df4b.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[kiszk]

LGTM

[kiszk]

Thanks! merging to master.

[wangyum]

Congratulation, @kiszk

[seancxmao]

@kiszk @wangyum Thank you!

[gengliangwang]

Congratulation, @kiszk

I am working on #22513 . If it is possible, could you wait until we reach an agreement in that PR before merging other benchmark?
In this PR, there is also such problem:

import org.apache.spark.util.{Benchmark, BenchmarkBase => FileBenchmarkBase}

[kiszk]

I see. I will wait in other PRs.