Re: Issues with ON CONFLICT UPDATE and REINDEX CONCURRENTLY

Thanks, pushed this one after some more editorialization.

I've discovered that despite removing FIXME (in 90eae926a), the error
"invalid arbiter index list" can still be triggered with:
CREATE TABLE pt (a int PRIMARY KEY) PARTITION BY RANGE (a);
CREATE TABLE p1 PARTITION OF pt FOR VALUES FROM (1) to (2) PARTITION BY RANGE (a);
CREATE TABLE p1_1 PARTITION OF p1 FOR VALUES FROM (1) TO (2);
CREATE UNIQUE INDEX ON ONLY p1 (a);
INSERT INTO p1 VALUES (1) ON CONFLICT (a) DO NOTHING;
ERROR:  XX000: invalid arbiter index list
LOCATION:  ExecInitPartitionInfo, execPartition.c:863

The first commit it produced on with this script is bc32a12e0.

Best regards,
Alexander