[DERBY-7139] Boolean expressions cannot be passed to COALESCE function

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 10.15.2.0
• Component/s: SQL
• Urgency: Normal
• Issue & fix info: Repro attached, Workaround attached
• Bug behavior facts: Deviation from standard
• Assignee: Unassigned
• Reporter: Lukas Eder
• Created: 25/May/22 06:57
• Updated: 25/May/22 15:27

Description

While this parses just fine:

values(
  nullif(
    1 = 0,
    exists(values(1))
  )
);

This doesn't work:

values(
  coalesce(
    1 = 0,
    exists(values(1))
  )
);

Resulting in:

SQL Error [30000] [42X01]: Syntax error: Encountered "=" at line 3, column 7.

The workaround is to wrap both arguments in parentheses

values(
  coalesce(
    (1 = 0),
    (exists(values(1)))
  )
);

I don't think there's a good reason for this limitation, so I'm guessing it's a parser bug?