[JENA-1126] Make SAMPLE avoid undefs/errors if there are valid choices.

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Done
• Fix Version/s: Jena 3.1.0
• Component/s: ARQ
• Assignee: Andy Seaborne
• Reporter: Andy Seaborne
• Created: 29/Jan/16 21:51
• Updated: 14/May/16 09:51
• Resolved: 30/Jan/16 21:53

Description

From https://lists.w3.org/Archives/Public/public-sparql-dev/2016JanMar/0005.html

SAMPLE({1, 2, error})

is error currently (for any order). It tends to favour errors as that is checked before a sampling.

It can be 1 or 2. All are right but returning a value if possible is more helpful.