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commit    181ccbb5e49cdc628e0c8334a9ed57dbc736efe8
Author:   Alvaro Herrera <alvherre@alvh.no-ip.org>
Date:     Thu Apr 12 19:51:55 2018 +0000
First released in: 11.0

    Add comment about default partition in check_new_partition_bound
    
    The intention of the test is not immediately obvious, so we need this
    much.


 src/backend/catalog/partition.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/backend/catalog/partition.c b/src/backend/catalog/partition.c
index 0f5932feeef..55130e66e4b 100644
--- a/src/backend/catalog/partition.c
+++ b/src/backend/catalog/partition.c
@@ -858,6 +858,12 @@ check_new_partition_bound(char *relname, Relation parent,
 
 	if (spec->is_default)
 	{
+		/*
+		 * The default partition bound never conflicts with any other
+		 * partition's; if that's what we're attaching, the only possible
+		 * problem is that one already exists, so check for that and we're
+		 * done.
+		 */
 		if (boundinfo == NULL || !partition_bound_has_default(boundinfo))
 			return;
 


[parent: 2fe977712c73]