Render column types in SQL as it is implied in cast() (but was never used?)

Author: Sergey Vasilyev

data_diff/databases/base.py

@@ -267,6 +267,8 @@ def _compile(self, compiler: Compiler, elem) -> str:
             return "NULL"
         elif isinstance(elem, Compilable):
             return self.render_compilable(attrs.evolve(compiler, root=False), elem)
+        elif isinstance(elem, ColType):
+            return self.render_coltype(attrs.evolve(compiler, root=False), elem)
         elif isinstance(elem, str):
             return f"'{elem}'"
         elif isinstance(elem, (int, float)):
@@ -359,6 +361,9 @@ def render_compilable(self, c: Compiler, elem: Compilable) -> str:
             raise RuntimeError(f"Cannot render AST of type {elem.__class__}")
         # return elem.compile(compiler.replace(root=False))
 
+    def render_coltype(self, c: Compiler, elem: ColType) -> str:
+        return self.type_repr(elem)
+
     def render_column(self, c: Compiler, elem: Column) -> str:
         if c._table_context:
             if len(c._table_context) > 1: