Re: Index AM API cleanup

Next, I have reviewed patches

v17-0010-Track-sort-direction-in-SortGroupClause.patch
v17-0011-Track-scan-reversals-in-MergeJoin.patch

Both of these seem ok and sensible to me.

They take the concept of the "reverse" flag that already exists in the 
affected code and just apply it more consistently throughout the various 
code layers, instead of relying on strategy numbers as intermediate 
storage.  This is both helpful for your ultimate goal in this patch 
series, and it also makes the affected code areas simpler and more 
consistent and robust.