Re: Remove "FROM" in "DELETE FROM" when using tab-completion

On Mon, May 10, 2021 at 05:36:35AM +0000, tanghy(dot)fnst(at)fujitsu(dot)com wrote:
> You see, the tab-completion for "DELETE" is "DELETE FROM" which is not same as help-command said(which is "DELETE").
> I tried to figure out why "FROM" is introduced here, but no good result got. In [1] someone changed "DELETE" to "DELETE FROM" but no reason added.
>
> IMO, the "FROM" is unnecessary just like "INTO" for "INSERT" command. So I tried to fix the inconsistency by removing "FROM" from "DELETE FROM" in tab-complete.c.
> Please see the attached patch. Any comment or different thought is very welcome.

I think the behavior now is correct. The goal of autocompletion is to save
keystrokes and time. As the only valid keyword after a DELETE (at least in a
DeleteStmt) is FROM, it's a good thing that you get back "DELETE FROM" directly
rather than asking that to autocomplete in multiple steps.

Now, the \help command is for commands, which is a different thing as the
command in that case is DELETE not DELETE FROM, even if you will have to follow
your DELETE with a FROM.