[SPARK-18745][SQL] Fix signed integer overflow due to toInt cast

## What changes were proposed in this pull request?

This PR avoids that a result of a cast `toInt` is negative due to signed integer overflow (e.g. 0x0000_0000_1???????L.toInt < 0 ). This PR performs casts after we can ensure the value is within range of signed integer (the result of `max(array.length, ???)` is always integer).

## How was this patch tested?

Manually executed query68 of TPC-DS with 100TB

Author: Kazuaki Ishizaki <ishizaki@jp.ibm.com>

Closes #16235 from kiszk/SPARK-18745.