fn convert_identifier(
ident: &Ident,
column_name_and_type: &HashMap<&String, ConcreteDataType>,
) -> Result<(String, ConcreteDataType)>fn convert_identifier(
ident: &Ident,
column_name_and_type: &HashMap<&String, ConcreteDataType>,
) -> Result<(String, ConcreteDataType)>