new option "switch-threshold"

[gsmolk]

Hello!
Recently, when running pg_repack on really busy table, we were unable to catchup due to MIN_TUPLES_BEFORE_SWITCH been less than the size of average insert, populating the table.
So I would like to propose the patch, which should remedy such situations by parameterizing the switch threshold value instead of using macro. New options is "-r | --switch-threshold"

Thank you for a great tool.

[czhc]

@dvarrazzo is this PR still valid?

[dvarrazzo]

@dvarrazzo is this PR still valid?

I haven't reviewed it. I am not working actively on the project at the moment.

[MichaelDBA]

Can we merge this pull request?

[andreasscherbaum]

@gsmol Can you please rebase this PR? This will also trigger the checks. Thanks!

[za-arthur]

Looks good to me.
@andreasscherbaum I triggered tests in a separate branch:
https://github.com/adjust/pg_repack/commits/switch_threshold

Related issue: #126, and PR: #147.

[Melkij]

Looks good. Although I think the short version for this option is unnecessary. Also it probably makes sense to increase the default value (at least up to 100).

[andreasscherbaum]

This branch has conflicts which need to be resolved.

[za-arthur]

Because the PR is created from private branch gsmol:switch_threshold to rebase and resolve conflicts I created new PR:
#347

[andreasscherbaum]

Handled in this PR: #347