[FLINK-17339][table] Change default planner to blink

[KurtYoung]

What is the purpose of the change

Change the default planner to blink, and update test cases caused by this.

Verifying this change

This change is already covered by existing tests

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Last check on commit 1bb8ea4 (Sat Apr 25 13:40:03 UTC 2020)

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• ❓ 1. The [description] looks good.
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[libenchao]

@KurtYoung Thanks for the contribution, I left some minor comments.
TpcdsTestProgram, BatchSQLTestProgram is missing.

[KurtYoung]

@libenchao Thanks for the reviewing, I've addressed your comments.

[libenchao]

@KurtYoung Thanks for addressing my comments. It seems that you didn't notice

TpcdsTestProgram and BatchSQLTestProgram is missing

in the comment.

[KurtYoung]

@libenchao I've noticed them. I think it's ok to use blink planner explicitly

[libenchao]

@KurtYoung Thanks for the explain, the changes LGTM now.
BTW, we should also update the documentation about this change. (I think you must be aware of this, and planned to do it in another issue. Just a reminder)

[KurtYoung]

Yes, it's FLINK-17340

[JingsongLi]

Thanks @KurtYoung , looks good to me overall. Left some comments.