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Correct code comments for PartitionedRelPruneInfo struct

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The comments above the PartitionedRelPruneInfo struct incorrectly
document how subplan_map and subpart_map are indexed.  This seems to
have snuck in on 4e232364033.

Author: David Rowley <david.rowley@2ndquadrant.com>
This commit is contained in:
Peter Eisentraut 2018-11-15 23:04:48 +01:00
parent fd5274a65b
commit 59f372e082
1 changed files with 10 additions and 9 deletions
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19
src/include/nodes/plannodes.h
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@ -1089,15 +1089,16 @@ typedef struct PartitionPruneInfo
* PartitionedRelPruneInfo - Details required to allow the executor to prune
* partitions for a single partitioned table.
*
* subplan_map[] and subpart_map[] are indexed by partition index (where
* zero is the topmost partition, and non-leaf partitions must come before
* their children). For a leaf partition p, subplan_map[p] contains the
* zero-based index of the partition's subplan in the parent plan's subplan
* list; it is -1 if the partition is non-leaf or has been pruned. For a
* non-leaf partition p, subpart_map[p] contains the zero-based index of
* that sub-partition's PartitionedRelPruneInfo in the hierarchy's
* PartitionedRelPruneInfo list; it is -1 if the partition is a leaf or has
* been pruned. Note that subplan indexes are global across the parent plan
* subplan_map[] and subpart_map[] are indexed by partition index of the
* partitioned table referenced by 'rtindex', the partition index being the
* order that the partitions are defined in the table's PartitionDesc. For a
* leaf partition p, subplan_map[p] contains the zero-based index of the
* partition's subplan in the parent plan's subplan list; it is -1 if the
* partition is non-leaf or has been pruned. For a non-leaf partition p,
* subpart_map[p] contains the zero-based index of that sub-partition's
* PartitionedRelPruneInfo in the hierarchy's PartitionedRelPruneInfo list;
* it is -1 if the partition is a leaf or has been pruned. Note that subplan
* indexes, as stored in 'subplan_map', are global across the parent plan
* node, but partition indexes are valid only within a particular hierarchy.
*/
typedef struct PartitionedRelPruneInfo