Unexpected SyntaxError in toBoolean ∘ all

[DominicWuest]

When running the following query:

RETURN (CASE toBoolean(all(n0 IN null WHERE true)) WHEN false THEN 0 END)

I encountered the following error:

Neo4jError: Neo.ClientError.Statement.SyntaxError (Invalid input 'toBoolean': expected "WHEN" (line 1, column 14 (offset: 13))
"RETURN (CASE toBoolean(all(n0 IN null WHERE true)) WHEN false THEN 0 END)"
              ^)

I believe the query mentioned above is semantically and syntactically correct and thus no error should be thrown here.

I encountered this issue when testing queries against the Neo4j 5.18.0 community & enterprise version in a Docker container running alpine v.3.

Similarly, running

RETURN toBoolean(all(n0 IN [] WHERE true))

results in the following error:

Neo4jError: Neo.ClientError.Statement.SyntaxError (Invalid input 'WHERE': expected
  [...]
  "^" (line 1, column 31 (offset: 30))
"RETURN toBoolean(all(n0 IN [] WHERE true))"
                               ^)

Steps to reproduce

Run the following queries and observe it throws an error:

RETURN (CASE toBoolean(all(n0 IN null WHERE true)) WHEN false THEN 0 END)

Expected behavior

The query should run successfully

Actual behavior

The query fails with the error message SyntaxError (Invalid input 'toBoolean': expected "WHEN")