[SPARK-11677][SQL] ORC filter tests all pass if filters are actually not pushed down.

[HyukjinKwon]

Currently ORC filters are not tested properly. All the tests pass even if the filters are not pushed down or disabled. In this PR, I add some logics for this.
Since ORC does not filter record by record fully, this checks the count of the result and if it contains the expected values.

[SparkQA]

Test build #45845 has finished for PR 9687 at commit 82d0aa7.

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

[SparkQA]

Test build #45965 has finished for PR 9687 at commit cd7bd12.

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

[HyukjinKwon]

Several things to mention.

Firstly, I wonder if it is okay to put extractSourceRDDToDataFrame at QueryTest. I did not put as I thought the purpose of QueryTest is not for that and also I did not want to create another class for single shared function. However, I think the extractSourceRDDToDataFrame can be shared with ParquetFilterSuite #9659.

Secondly, I originally wanted to add OrcFilterSuite separately in order to test actual filter evaluation; however, I decided not to do it here (I will do in a separate issue or followup PR) but just let the original test way work properly first.

[HyukjinKwon]

cc @liancheng

[HyukjinKwon]

In this commit, I renamed the function extractSourceRDDToDataFrame to stripSparkFilter.

[HyukjinKwon]

Can I add the function stripSparkFilter to SQLTestUtils for ParquetFilterSuite and OrcQuerySuite (and possibly OrcFilterSuite I will make)?

+JDBCDatasource also needs to be properly tested with the function (filed in Jira and created PR).

[SparkQA]

Test build #47395 has finished for PR 9687 at commit 18c0326.

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

[HyukjinKwon]

The function I mentioned is moved to SQLTestUtils in another PR. So I will add a commit for this soon.

[HyukjinKwon]

In the commits above, I removed the stripSparkFilter function to share this.

[HyukjinKwon]

retest this please

[SparkQA]

Test build #47785 has finished for PR 9687 at commit ce9706c.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):\n * case class WrapOption(child: Expression, optType: DataType)\n

[marmbrus]

Thanks, merging to master.