diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/executor/execPartition.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/src/backend/executor/execPartition.c b/src/backend/executor/execPartition.c index 75329b36241..c83991c93c5 100644 --- a/src/backend/executor/execPartition.c +++ b/src/backend/executor/execPartition.c @@ -973,11 +973,13 @@ get_partition_dispatch_recurse(Relation rel, Relation parent, * The 'indexes' array is used when searching for a partition matching a * given tuple. The actual value we store here depends on whether the * array element belongs to a leaf partition or a subpartitioned table. - * For leaf partitions we store the 0-based index into *leaf_part_oids, - * and for sub-partitioned tables we store a negative version of the - * 1-based index into the *pds list. When searching, if we see a negative - * value, the search must continue in the corresponding sub-partition; - * otherwise, we've identified the correct partition. + * For leaf partitions we store the index into *leaf_part_oids, and for + * sub-partitioned tables we store a negative version of the index into + * the *pds list. Both indexes are 0-based, but the first element of the + * *pds list is the root partition, so 0 always means the first leaf. When + * searching, if we see a negative value, the search must continue in the + * corresponding sub-partition; otherwise, we've identified the correct + * partition. */ pd->indexes = (int *) palloc(partdesc->nparts * sizeof(int)); for (i = 0; i < partdesc->nparts; i++) |