diff options
Diffstat (limited to 'src/backend/optimizer/plan/planmain.c')
| -rw-r--r-- | src/backend/optimizer/plan/planmain.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/src/backend/optimizer/plan/planmain.c b/src/backend/optimizer/plan/planmain.c index ff39d5754dc..009841d9dd3 100644 --- a/src/backend/optimizer/plan/planmain.c +++ b/src/backend/optimizer/plan/planmain.c @@ -40,7 +40,7 @@ static void canonicalize_all_pathkeys(PlannerInfo *root); * which may involve joins but not any fancier features. * * Since query_planner does not handle the toplevel processing (grouping, - * sorting, etc) it cannot select the best path by itself. It selects + * sorting, etc) it cannot select the best path by itself. It selects * two paths: the cheapest path that produces all the required tuples, * independent of any ordering considerations, and the cheapest path that * produces the expected fraction of the required tuples in the required @@ -64,7 +64,7 @@ static void canonicalize_all_pathkeys(PlannerInfo *root); * does not use grouping * * Note: the PlannerInfo node also includes a query_pathkeys field, which is - * both an input and an output of query_planner(). The input value signals + * both an input and an output of query_planner(). The input value signals * query_planner that the indicated sort order is wanted in the final output * plan. But this value has not yet been "canonicalized", since the needed * info does not get computed until we scan the qual clauses. We canonicalize @@ -109,7 +109,7 @@ query_planner(PlannerInfo *root, List *tlist, /* * If the query has an empty join tree, then it's something easy like - * "SELECT 2+2;" or "INSERT ... VALUES()". Fall through quickly. + * "SELECT 2+2;" or "INSERT ... VALUES()". Fall through quickly. */ if (parse->jointree->fromlist == NIL) { @@ -179,7 +179,7 @@ query_planner(PlannerInfo *root, List *tlist, /* * Examine the targetlist and join tree, adding entries to baserel * targetlists for all referenced Vars, and generating PlaceHolderInfo - * entries for all referenced PlaceHolderVars. Restrict and join clauses + * entries for all referenced PlaceHolderVars. Restrict and join clauses * are added to appropriate lists belonging to the mentioned relations. We * also build EquivalenceClasses for provably equivalent expressions. The * SpecialJoinInfo list is also built to hold information about join order @@ -201,7 +201,7 @@ query_planner(PlannerInfo *root, List *tlist, /* * If we formed any equivalence classes, generate additional restriction - * clauses as appropriate. (Implied join clauses are formed on-the-fly + * clauses as appropriate. (Implied join clauses are formed on-the-fly * later.) */ generate_base_implied_equalities(root); @@ -216,14 +216,14 @@ query_planner(PlannerInfo *root, List *tlist, /* * Examine any "placeholder" expressions generated during subquery pullup. * Make sure that the Vars they need are marked as needed at the relevant - * join level. This must be done before join removal because it might + * join level. This must be done before join removal because it might * cause Vars or placeholders to be needed above a join when they weren't * so marked before. */ fix_placeholder_input_needed_levels(root); /* - * Remove any useless outer joins. Ideally this would be done during + * Remove any useless outer joins. Ideally this would be done during * jointree preprocessing, but the necessary information isn't available * until we've built baserel data structures and classified qual clauses. */ @@ -308,7 +308,7 @@ query_planner(PlannerInfo *root, List *tlist, /* * If both GROUP BY and ORDER BY are specified, we will need two * levels of sort --- and, therefore, certainly need to read all the - * tuples --- unless ORDER BY is a subset of GROUP BY. Likewise if we + * tuples --- unless ORDER BY is a subset of GROUP BY. Likewise if we * have both DISTINCT and GROUP BY, or if we have a window * specification not compatible with the GROUP BY. */ |