"Jim Dew" <[EMAIL PROTECTED]> writes:
> Stumbled upon a (broken) query that causes the 8.1.0 thread handling the
> query to die:
> select foo from (select null) as foo

Confirmed here --- will look into it.  Thanks for the report!

> Now, this query just produces an error on 8.0.3

However, there's something rotten in the state of Denmark in 8.0 too:

regression=# select foo from (select null) as foo;
ERROR:  subquery foo does not have attribute 0

7.4 gives what I'd consider a reasonable error message:

regression=# select foo from (select null) as foo;
ERROR:  relation reference "foo" cannot be used as a select-list entry
HINT:  Write "foo".* to denote all the columns of the relation.

Maybe we need a regression test to exercise this case, because it seems
we've been backsliding on this rather badly ...

                        regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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