[FLINK-18699] Allow variables for column names in Scala Table API

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.12.0
• Component/s: Table SQL / API
• Labels: pull-request-available
• Assignee: Timo Walther
• Reporter: Timo Walther
• Created: 24/Jul/20 07:03
• Updated: 06/Nov/20 02:13
• Resolved: 27/Jul/20 13:07

Description

User have reported that the Scala API lacks a way to reference columns via a name that is stored in a variable. String interpolation is inconvenient in this case:

We should allow this also in Scala:

tab.select($(keyVar), $(valueVar))

Issue Links

• duplicates: FLINK-19956 $ does not work on variables without being qualified in Scala
• links to: GitHub Pull Request #12978