Re: ERROR: found unexpected null value in index

On Tue, Jul 9, 2019 at 6:08 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> The error is coming from the planner's get_actual_variable_range:
>
>                     /* Shouldn't have got a null, but be careful */
>                     if (isnull[0])
>                         elog(ERROR, "found unexpected null value in index \"%s\"",
>                              RelationGetRelationName(indexRel));
>
> and I think it's entirely within its rights to complain, because it
> set up the scan key to reject nulls.  In short, somebody seems to
> have broken btrees' processing of SK_ISNULL | SK_SEARCHNOTNULL scankeys,
> and they broke it in v11, because prior versions don't show this failure.

It's not obvious to me why that might be. I'll run a "git bisect" to
track down the offending commit.

-- 
Peter Geoghegan