ALTER TABLE ... SET DATA TYPE removes statistics

The current documentation does not mention that the column statistics are removed which I can see they are in
src/backend/commands/tablecmds.c

ATExecAlterColumnType
    /*
     * Drop any pg_statistic entry for the column, since it's now wrong type
     */
    RemoveStatistics(RelationGetRelid(rel), attnum);

Although this might be obvious it tripped me up.  For example renaming and SET STATISTICS preserves statistics.  Patch
attached.

Regards,

Nikolai