[IMPALA-12121] Add non empty check for UDF location in getLastModifiedTime method

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 4.3.0
• Component/s: Frontend
• Epic Color: ghx-label-7
• Assignee: Soumyakanti Das
• Reporter: Soumyakanti Das
• Created: 05/May/23 17:25
• Updated: 16/Jul/24 23:47
• Resolved: 16/May/23 21:27

Description

getLastModifiedTime() of Function.java assumes that if the UDF is not a BUILTIN and if the location is not null, it is a non-empty string. However, we may have UDFs with an empty location if they are in the install location and loaded at init time.

We should also add a non empty check for the location in the if condition.