We are working on the DB2 expression compiler and testing it with a
Python driver.
For an expression like NAME IS NULL
What should be the node type of NULL? It appears to be
QgsExpression::ntLiteral but it doesn't seem to have a valid value and
fails the call to quotedValue().
For now we are using a hack to check if n->dump() == NULL and treating
it as a special case.
Also, I assume that ILIKE is a case insensitive LIKE.
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