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Diffstat (limited to 'src/backend/optimizer/path/joinpath.c')
| -rw-r--r-- | src/backend/optimizer/path/joinpath.c | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/src/backend/optimizer/path/joinpath.c b/src/backend/optimizer/path/joinpath.c index dfbb839be16..9d4a9197ee6 100644 --- a/src/backend/optimizer/path/joinpath.c +++ b/src/backend/optimizer/path/joinpath.c @@ -2334,18 +2334,6 @@ select_mergejoin_clauses(PlannerInfo *root, * canonical pathkey list, but redundant eclasses can't appear in * canonical sort orderings. (XXX it might be worth relaxing this, * but not enough time to address it for 8.3.) - * - * Note: it would be bad if this condition failed for an otherwise - * mergejoinable FULL JOIN clause, since that would result in - * undesirable planner failure. I believe that is not possible - * however; a variable involved in a full join could only appear in - * below_outer_join eclasses, which aren't considered redundant. - * - * This case *can* happen for left/right join clauses: the outer-side - * variable could be equated to a constant. Because we will propagate - * that constant across the join clause, the loss of ability to do a - * mergejoin is not really all that big a deal, and so it's not clear - * that improving this is important. */ update_mergeclause_eclasses(root, restrictinfo); |