[BEAM-9746] [Go SDK] Empty side inputs causing spurious zero elements

• Type: Improvement
• Status: Resolved
• Priority: P2
• Resolution: Fixed
• Fix Version/s: Not applicable
• Component/s: sdk-go
• Assignee: Robert Burke
• Reporter: Robert Burke
• Created: 13/Apr/20 19:22
• Updated: 12/Jun/20 17:46
• Resolved: 12/Jun/20 17:46

Description

A user discovered that empty side inputs would spuriously provide a single zero element.

The error was narrowed down to the Go SDK's state manager code  copying the stateGetResponse data wasn't checking that the original data source even had any bytes in it, leading it in particular to interpret length prefixed data as having 0 length, which would cause zero value elements to be generated. Notably, this caused empty strings.

Issue Links

• links to: GitHub Pull Request #11413