The default values quoting changed in MariaDB 10, and we need to adjust in
pgloader: extra '' chars could defeat the default matching logic:
"'0000-00-00'" is different from "0000-00-00"
The MySQL special syntax "on update current_timestamp()" used to support
only a single column per table (in MySQL), and so did pgloader. In MariaDB
version 10 it's now possible to have several column with that special
treatment, so adapt pgloader to migrate that too.
What pgloader does is recognize that several columns are to receive the same
pre-update processing, and creates a single function that does the both of
them, as in the following example, from pgloader logs in a test case:
CREATE OR REPLACE FUNCTION mysql.on_update_current_timestamp_onupdate()
RETURNS trigger
LANGUAGE plpgsql
AS
$$
BEGIN
NEW.update_date = now();
NEW.calc_date = now();
RETURN NEW;
END;
$$;
CREATE TRIGGER on_update_current_timestamp
BEFORE UPDATE ON mysql.onupdate
FOR EACH ROW
EXECUTE PROCEDURE mysql.on_update_current_timestamp_onupdate();
Fixes#629.
At the moment it's a very manual process, and it might get automated
someday. Meanwhile it's still useful to have.
See #569 for an issue that got a test case added.
