LIKE clausule should accept functions on the pattern

In my case it worked when using "=" instead of "LIKE".

//works:
(CASE WHEN (Book.id = BookFrom.id) THEN BookTo.displayName ELSE BookFrom.displayName END) = :name

//[Syntax Error] line 0, col 1217: Error: Expected =, <, <=, <>, >, >=, !=, got 'LIKE'
(CASE WHEN (Book.id = BookFrom.id) THEN BookTo.displayName ELSE BookFrom.displayName END) LIKE :name

So the LIKE operator only needs to be allowed here.

I'm wondering which vendor should not be able to handle that:
The CASE WHEN ... THEN ... END is documented in DQL, and allowed.
LIKE itself is allowed.
If an RDBMs cannot use CASE WHEN and LIKE in combination, this would be a strange limitation.

This is not possible either:

WHERE CASE WHEN p.name IS NULL THEN u.username ELSE p.name END LIKE :name

I am sure there is a reason why the walker doesn't accept this such as not all supported vendors allowing functions in right hand side LIKE expressions, but i am not sure about this.

Sorry the Parser has to be modified also to allow expressions to be recognized, I'm attaching the necessary patch.