[SPARK-15445][SQL] Build fails for java 1.7 after adding java.mathBigInteger support

## What changes were proposed in this pull request?
Using longValue() and then checking whether the value is in the range for a long manually.

## How was this patch tested?
Existing tests

Author: Sandeep Singh <sandeep@techaddict.me>

Closes #13223 from techaddict/SPARK-15445.