2011/1/12 Itagaki Takahiro <itagaki.takahiro@gmail.com>:
> On Wed, Jan 12, 2011 at 20:18, Pavel Stehule <pavel.stehule@gmail.com> wrote:
>> there is one issue - probably useless checking a type equality in
>> function check_comparable and check_concatinatable, because when your
>> function is registrated with arguments (anyarray, anyarray), then is
>> guaranteed so type of array1 is same as type of array2, and then you
>> don't need to check.
>
> It's true for almost all cases, but we have "anyarray" columns in
> pg_statistic.stavaluesN. When we pass them to those array functions,
> element types of two anyarrays could be different.
> I guess they are protections only for them.
>
> =# SELECT A.stavalues1 SUBMULTISET OF B.stavalues1
> FROM pg_statistic A, pg_statistic B
> WHERE A.stakind1 = 2 AND B.stakind1 = 2;
> ERROR: cannot compare incompatible arrays
> DETAIL: Arrays with element types name and oid[] are not compatible
> for comparison.
>
ook
Pavel
> --
> Itagaki Takahiro
>