Coalesce each expression

Author: pik94

data_diff/sql.py

@@ -121,8 +121,8 @@ class Checksum(Sql):
 
  def compile(self, c: Compiler):
  if len(self.exprs) > 1:
- compiled_exprs = ", ".join(map(c.compile, self.exprs))
- expr = f"coalesce(concat({compiled_exprs}), 'null')"
+ compiled_exprs = ", ".join(f"coalesce({c.compile(expr)}, 'null')" for expr in self.exprs)
+ expr = f"concat({compiled_exprs})"
  else:
  (expr,) = self.exprs
  expr = c.compile(expr)