コメントやメッセージを修正した。

diff --git a/make_join_rel.c b/make_join_rel.c
index 49b255a..68606fe 100644 (file)
--- a/make_join_rel.c
+++ b/make_join_rel.c
@@ -44,7 +44,7 @@ adjust_rows(double rows, RowsHint *hint)
        hint->base.state = HINT_STATE_USED;
        if (result < 1.0)
                ereport(WARNING,
-                               (errmsg("make rows estimation 1 since below 1 : %s",
+                               (errmsg("Force estimate to be at least one row, to avoid possible divide-by-zero when interpolating costs : %s",
                                        hint->base.hint_str)));
        result = clamp_row_est(result);
        elog(DEBUG1, "adjusted rows %d to %d", (int) rows, (int) result);
@@ -122,12 +122,13 @@ make_join_rel(PlannerInfo *root, RelOptInfo *rel1, RelOptInfo *rel2)
                rows_hint = current_hint->rows_hints[i];
 
                /*
-                * This Rows hint specifies aliasname is error, or does not exist in
-                * query.
+                * This Rows hint is invalid for some reason, or it contains no
+                * aliasname which exists in the query.
                 */
                if (!rows_hint->joinrelids ||
                        rows_hint->base.state == HINT_STATE_ERROR)
                        continue;
+
                if (bms_equal(joinrelids, rows_hint->joinrelids))
                {
                        /*