Re: pgsql: Add psql tab completion for DO blocks.

itagaki(at)postgresql(dot)org (Takahiro Itagaki) writes:
> Add psql tab completion for DO blocks.
> Also adjust documentation of DO.

This syntax synopsis is completely nuts:

DO { [ LANGUAGE <replaceable class="PARAMETER">lang_name</replaceable> ] | <replaceable class="PARAMETER">code</replaceable> } ...

It implies that an empty string is a valid substitute for the { ... }
construct, since I could take the first choice and then omit the
optional bracketed construct.

I think that it would be logically correct without the square brackets,
but as a matter of clarity I really doubt it's an improvement over the
original.

regards, tom lane