Specify the return type to its proper class.
Minor refactor for readability.
Method renamed.
Code tidy.
Refactor the SqlDeparser to make it decouple from formatting utils.
Make as a final class.
Remove unsupported type from the mapping.
Remove unused class.
Code tidy.
Code tidy.
Add method interface to get the column type.
Reimplement datatype-override RDF literal in the parsers.
Implement CAST function in SQL dialects.
Separate the SQL select list handler to a different visitor class.
Remove unused method. The SQL column class should be a read-only object.
Code tidy.
Rename exception class.
Remove ISqlSelectItemVisitor. It turns out the deparser can use
ISqlExpressionVisitor to implement SelectItemVisitor.
Fix typo.
Reimplement SQL BIT type (=boolean).