[SPARK-23893][Core][SQL] Avoid possible integer overflow in multiplication

[kiszk]

What changes were proposed in this pull request?

This PR avoids possible overflow at an operation long = (long)(int * int). The multiplication of large positive integer values may set one to MSB. This leads to a negative value in long while we expected a positive value (e.g. 0111_0000_0000_0000 * 0000_0000_0000_0010).

This PR performs long cast before the multiplication to avoid this situation.

How was this patch tested?

Existing UTs

[kiszk]

cc @gatorsmile @hvanhovell

[SparkQA]

Test build #89012 has finished for PR 21002 at commit ac24549.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[kiszk]

retest this please

[SparkQA]

Test build #89020 has finished for PR 21002 at commit ac24549.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[kiszk]

retest this please

[SparkQA]

Test build #89024 has finished for PR 21002 at commit ac24549.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.

[kiszk]

retest this please

[SparkQA]

Test build #89030 has finished for PR 21002 at commit ac24549.

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

[hvanhovell]

LGTM - merging to master.