Is there value in having optimizer stats for joins/foreignkeys?

Applying: Unify extended statistics columns and expressions into a single stxexprs list
Using index info to reconstruct a base tree...
M	doc/src/sgml/perform.sgml
M	src/backend/catalog/system_views.sql
M	src/backend/commands/statscmds.c
M	src/backend/optimizer/util/plancat.c
M	src/backend/parser/parse_utilcmd.c
M	src/backend/statistics/dependencies.c
M	src/backend/statistics/extended_stats.c
M	src/backend/statistics/mcv.c
M	src/backend/statistics/mvdistinct.c
M	src/backend/utils/adt/ruleutils.c
M	src/backend/utils/adt/selfuncs.c
M	src/bin/psql/describe.c
M	src/include/catalog/pg_proc.dat
M	src/include/nodes/pathnodes.h
M	src/test/regress/expected/rules.out
M	src/test/regress/expected/stats_ext.out
M	src/test/regress/expected/stats_import.out
M	src/test/regress/sql/stats_ext.sql
M	src/test/regress/sql/stats_import.sql
Falling back to patching base and 3-way merge...
Auto-merging src/test/regress/sql/stats_import.sql
Auto-merging src/test/regress/sql/stats_ext.sql
Auto-merging src/test/regress/expected/stats_import.out
Auto-merging src/test/regress/expected/stats_ext.out
Auto-merging src/test/regress/expected/rules.out
Auto-merging src/include/nodes/pathnodes.h
Auto-merging src/include/catalog/pg_proc.dat
Auto-merging src/bin/psql/describe.c
Auto-merging src/backend/utils/adt/selfuncs.c
Auto-merging src/backend/utils/adt/ruleutils.c
Auto-merging src/backend/statistics/mvdistinct.c
Auto-merging src/backend/statistics/mcv.c
Auto-merging src/backend/statistics/extended_stats.c
Auto-merging src/backend/statistics/dependencies.c
Auto-merging src/backend/parser/parse_utilcmd.c
Auto-merging src/backend/optimizer/util/plancat.c
Auto-merging src/backend/commands/statscmds.c
CONFLICT (content): Merge conflict in src/backend/commands/statscmds.c
Auto-merging src/backend/catalog/system_views.sql
Auto-merging doc/src/sgml/perform.sgml
Patch failed at 0001 Unify extended statistics columns and expressions into a single stxexprs list

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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