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Diffstat (limited to 'src/backend/optimizer/plan/planner.c')
| -rw-r--r-- | src/backend/optimizer/plan/planner.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c index 6ee411eec87..09d4ea12e87 100644 --- a/src/backend/optimizer/plan/planner.c +++ b/src/backend/optimizer/plan/planner.c @@ -1536,9 +1536,11 @@ grouping_planner(PlannerInfo *root, double tuple_fraction) standard_qp_callback, &qp_extra); /* - * Extract rowcount and width estimates for use below. + * Extract rowcount and width estimates for use below. If final_rel + * has been proven dummy, its rows estimate will be zero; clamp it to + * one to avoid zero-divide in subsequent calculations. */ - path_rows = final_rel->rows; + path_rows = clamp_row_est(final_rel->rows); path_width = final_rel->width; /* |