[IMPALA-5688] Speed up a couple of heavy-hitting expr-tests

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 2.9.0
• Fix Version/s: Impala 2.10.0
• Component/s: Infrastructure
• Epic Color: ghx-label-5
• Assignee: Henry Robinson
• Reporter: Henry Robinson
• Created: 20/Jul/17 17:54
• Updated: 22/Jul/17 21:12
• Resolved: 22/Jul/17 21:12

Description

Two tests (LongReverse and the base64 tests in StringFunctions) run their tests over all lengths from 0..some length. Both take several minutes to complete. This adds a lot of runtime for not much more confidence. If instead we pick a set of 'interesting' (including powers-of-two, prime numbers, edge-cases) lengths, we can get a similar amount of confidence while significantly reducing the runtime of expr-test.