[SPARK-10393] use ML pipeline in LDA example

[hhbyyh]

jira: https://issues.apache.org/jira/browse/SPARK-10393

Since the logic of the text processing part has been moved to ML estimators/transformers, replace the related code in LDA Example with the ML pipeline.

[SparkQA]

Test build #41868 has finished for PR 8551 at commit 84cc1be.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • class DCT(JavaTransformer, HasInputCol, HasOutputCol):
  • class SQLTransformer(JavaTransformer):

[feynmanliang]

Can we revert these NOOP changes (here and stopwordFile) since there's no style guide violation here?

[hhbyyh]

@feynmanliang Thanks for the review. I'll update later today.

[hhbyyh]

@feynmanliang @jkbradley Sorry for the late update.

[SparkQA]

Test build #43561 has finished for PR 8551 at commit ee4832d.

• This patch fails MiMa tests.
• This patch merges cleanly.
• This patch adds no public classes.

[hhbyyh]

download failed: org.apache.spark#spark-unsafe_2.10;1.5.0!spark-unsafe_2.10.jar

need to trigger the test again?

[SparkQA]

Test build #2026 has finished for PR 8551 at commit ee4832d.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[hhbyyh]

unrelated UT timeout failure:

SPARK-11188 Analysis error reporting *** FAILED *** (2 minutes)
[info] =======================
[info] CliSuite failure output
[info] =======================
[info] Spark SQL CLI command line: ../../bin/spark-sql --master local --hiveconf

[feynmanliang]

Jenkins retest this please

[SparkQA]

Test build #45515 has finished for PR 8551 at commit ee4832d.

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

[BenFradet]

Are you sure about removing the scalastyle line?

[SparkQA]

Test build #2177 has finished for PR 8551 at commit ee4832d.

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

[jkbradley]

Those 3 items (thanks @BenFradet ) are the only issues I see. Thanks!

[hhbyyh]

Thanks @jkbradley @BenFradet for the review.

[SparkQA]

Test build #47324 has finished for PR 8551 at commit 672ce97.

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

[jkbradley]

LGTM. Merging with master and branch-1.6

Thank you!