[SPARK-14739][Python] Fix for Sparse and Dense Vector Parsing Errors

[vishnu667]

What changes were proposed in this pull request?

Fixed parsing empty dense and sparse vectors, corrected dead parsing tests.

How was this patch tested?

Fixed parsing tests, added tests specific to SPARK-14739

[viirya]

duplicate to #12516.

[vishnu667]

@viirya @srowen

#12516 Has not Fixed the Incorrect Test cases and has only added his test case to the existing

They have been comparing the parsing the values using assertTrue instead of assertEquals.
Fix for the Existing previous test cases

[srowen]

EDIT: I encountered these out of order. Actually, I'd be happy to see the first of these two merged that fixes all the issues. Go ahead here. Really the other PR came second

[vishnu667]

@srowen I've tested both the PR and both have the issue Fixed the only difference is the test case I've mentioned earlier which is already patched in this request.

[srowen]

Jenkins test this please

[SparkQA]

Test build #56351 has finished for PR 12513 at commit e63b6b2.

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

[srowen]

Looks pretty good to me based on my understanding of the issue

[arashpa]

@srowen I had another PR #12510 coming in first but made a mistake by closing it. I'm also the original person who found the bug and created the first solution for it. Please if possible consider #12516 as the candidate solution.

[srowen]

EDIT again: OK, see discussion on #12516 about why maybe that's fairer to merge

[srowen]

Thank you @vishnu667 for the assist, you can close this PR.

[vishnu667]

#12516