[Qgis-developer] Question about expression compiling

[David Adler]

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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