PATCH: generate fractional cheapest paths in generate_orderedappend_path

Applying: Consider incremental sort in generate_orderedappend_paths
Using index info to reconstruct a base tree...
M	src/backend/optimizer/path/allpaths.c
M	src/backend/optimizer/path/pathkeys.c
M	src/backend/optimizer/plan/planagg.c
M	src/backend/utils/misc/guc.c
M	src/include/optimizer/paths.h
M	src/test/regress/sql/partition_join.sql
Falling back to patching base and 3-way merge...
Auto-merging src/test/regress/sql/partition_join.sql
Auto-merging src/include/optimizer/paths.h
CONFLICT (content): Merge conflict in src/include/optimizer/paths.h
Auto-merging src/backend/utils/misc/guc.c
CONFLICT (content): Merge conflict in src/backend/utils/misc/guc.c
Auto-merging src/backend/optimizer/plan/planagg.c
Auto-merging src/backend/optimizer/path/pathkeys.c
CONFLICT (content): Merge conflict in src/backend/optimizer/path/pathkeys.c
Auto-merging src/backend/optimizer/path/allpaths.c
CONFLICT (content): Merge conflict in src/backend/optimizer/path/allpaths.c
Patch failed at 0001 Consider incremental sort in generate_orderedappend_paths

error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
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