Kazuyuki Honda

@kyleconroy @caleblloyd It's very difficult say this is bug of SQLite parser. I know `NULL` constraint is accepted by SQLite3 binary, but in the spec, `NULL` constraint is not valid...

Yes, it should be parser error based on the spec. For my personal use, I don't use NULL constraints because it's default behavior. But if someone want to update SQLite...

@mattiasgrenfeldt This issue should be resolved by #1687