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Diffstat (limited to 'src/backend/optimizer/path/costsize.c')
| -rw-r--r-- | src/backend/optimizer/path/costsize.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c index 2d2df60886a..d11bf19e30a 100644 --- a/src/backend/optimizer/path/costsize.c +++ b/src/backend/optimizer/path/costsize.c @@ -5137,7 +5137,6 @@ static double get_parallel_divisor(Path *path) { double parallel_divisor = path->parallel_workers; - double leader_contribution; /* * Early experience with parallel query suggests that when there is only @@ -5150,9 +5149,14 @@ get_parallel_divisor(Path *path) * its time servicing each worker, and the remainder executing the * parallel plan. */ - leader_contribution = 1.0 - (0.3 * path->parallel_workers); - if (leader_contribution > 0) - parallel_divisor += leader_contribution; + if (parallel_leader_participation) + { + double leader_contribution; + + leader_contribution = 1.0 - (0.3 * path->parallel_workers); + if (leader_contribution > 0) + parallel_divisor += leader_contribution; + } return parallel_divisor; } |