I would like to have support for FROM_UNIXTIME() function, as available in
MySQL:
https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_from-unixtime

Some background about this feature request.

I perfectly understand that SQLite is not MySQL, that FROM_UNIXTIME is a
function currently only available in MySQL , and that the equivalent in
SQLite is to use the "unixepoch" modifier in date and time function.

ProxySQL (https://github.com/sysown/proxysql/) is a proxy for MySQL , and
it uses SQLite (currently bundled) to store configuration and export
metrics using a MySQL interface built on top of SQLite iself.
A feature request for ProxySQL was to have FROM_UNIXTIME() available (
https://github.com/sysown/proxysql/issues/758), and this was made available
in:
* for SQLite 3.15 :
https://github.com/sysown/proxysql/commit/b49966a8509f2c85e2507534ed6f1843a654ac81
* for SQLite 3.19 :
https://github.com/sysown/proxysql/blob/312a04c73dafc6f5c23bb308c1a70b5f3728899e/deps/sqlite3/from_unixtime.patch


It is being discussed in https://bugzilla.redhat.com/show_bug.cgi?id=1457929
about de-bundling SQLite from ProxySQL , and having this feature upstream
(SQLite) should allow to de-bundle the two softwares.

Would you accept (or improve) the function FROM_UNIXTIME as implemented in
https://github.com/sysown/proxysql/blob/312a04c73dafc6f5c23bb308c1a70b5f3728899e/deps/sqlite3/from_unixtime.patch
?

Thanks,
René
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