[CALCITE-2530] TRIM function does not throw exception when the length of trim character is not 1(one)

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: core
• Assignee: Unassigned
• Reporter: Hongze Zhang
• Created: 05/Sep/18 03:02
• Updated: 22/Feb/19 01:22

Description

Calcite's TRIM function takes the first character of <trim character> string to trim the <trim source>, whereas SQL standard suggests to report a "trim error" when the length of <trim character> is not 1.

I am not sure if this could be treated as an issue(since the calcite's way might has better availability), until I found this:

https://issues.apache.org/jira/browse/BEAM-4704

It seems user could be sometimes confused with the behavior of TRIM function in Calcite.