While I'm looking at this ... the current implementation has got a
number of very inconsistent behaviors with respect to when it will
expand a variable reference within a psql meta-command argument.
Observe:
regression=# \set foo 'value of foo'
regression=# \set bar 'value of bar'
regression=# \echo :foo
value of foo
regression=# \echo :foo@bar
value of foo @bar
(there shouldn't be a space before the @, IMO --- there is because this
gets treated as two separate arguments, which seems bizarre)
regression=# \echo :foo:bar
value of foo value of bar
(again, why is this two arguments not one?)
regression=# \echo :foo@:bar
value of foo @:bar
(why isn't :bar expanded here, when it is in the previous case?)
regression=# \echo foo:foo@:bar
foo:foo@:bar
(and now neither one gets expanded)
ISTM the general rule ought to be that we attempt to substitute for a
colon-construct regardless of where it appears within an argument, as
long as it's not within quotes.
Thoughts?
regards, tom lane
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