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| -rw-r--r-- | src/backend/optimizer/README | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/optimizer/README b/src/backend/optimizer/README index 0db3d36208d..9c852a15ef0 100644 --- a/src/backend/optimizer/README +++ b/src/backend/optimizer/README @@ -1109,7 +1109,7 @@ of joining relations. Partitionwise aggregates/grouping --------------------------------- -If the GROUP BY clause has contains all of the partition keys, all the rows +If the GROUP BY clause contains all of the partition keys, all the rows that belong to a given group must come from a single partition; therefore, aggregation can be done completely separately for each partition. Otherwise, partial aggregates can be computed for each partition, and then finalized |