[SPARK-4593][SQL] Return null when denominator is 0

SELECT max(1/0) FROM src
would return a very large number, which is obviously not right.
For hive-0.12, hive would return `Infinity` for 1/0, while for hive-0.13.1, it is `NULL` for 1/0.
I think it is better to keep our behavior with newer Hive version.
This PR ensures that when the divider is 0, the result of expression should be NULL, same with hive-0.13.1

Author: Daoyuan Wang <daoyuan.wang@intel.com>

Closes #3443 from adrian-wang/div and squashes the following commits:

2e98677 [Daoyuan Wang] fix code gen for divide 0
85c28ba [Daoyuan Wang] temp
36236a5 [Daoyuan Wang] add test cases
6f5716f [Daoyuan Wang] fix comments
cee92bd [Daoyuan Wang] avoid evaluation 2 times
22ecd9a [Daoyuan Wang] fix style
cf28c58 [Daoyuan Wang] divide fix
2dfe50f [Daoyuan Wang] return null when divider is 0 of Double type
[SPARK-4670] [SQL] wrong symbol for bitwise not

We should use `~` instead of `-` for bitwise NOT.

Author: Daoyuan Wang <daoyuan.wang@intel.com>

Closes #3528 from adrian-wang/symbol and squashes the following commits:

affd4ad [Daoyuan Wang] fix code gen test case
56efb79 [Daoyuan Wang] ensure bitwise NOT over byte and short persist data type
f55fbae [Daoyuan Wang] wrong symbol for bitwise not
[SPARK-4695][SQL] Get result using executeCollect

Using ```executeCollect``` to collect the result, because executeCollect is a custom implementation of collect in spark sql which better than rdd's collect

Author: wangfei <wangfei1@huawei.com>

Closes #3547 from scwf/executeCollect and squashes the following commits:

a5ab68e [wangfei] Revert "adding debug info"
a60d680 [wangfei] fix test failure
0db7ce8 [wangfei] adding debug info
184c594 [wangfei] using executeCollect instead collect