From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Fri, 30 Oct 2020 23:52:31 -0500
Subject: [PATCH v13 04/18] ReindexPartitions() to set indisvalid..

Something like this should probably have been included in
a6642b3ae060976b42830b7dc8f29ec190ab05e4

See also 71a05b223, which mentioned the absence of any way to validate an
index.
---
 src/backend/commands/indexcmds.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index 10d4da136f..b21555b6cf 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -1643,8 +1643,6 @@ reindex_invalid_child_indexes(Oid indexRelationId)
 	 * CIC needs to mark a partitioned index as VALID, which itself
 	 * requires setting READY, which is unset for CIC (even though
 	 * it's meaningless for an index without storage).
-	 * This must be done only while holding a lock which precludes adding
-	 * partitions.
 	 */
 	CommandCounterIncrement();
 	index_set_state_flags(indexRelationId, INDEX_CREATE_SET_READY);
@@ -1654,9 +1652,6 @@ reindex_invalid_child_indexes(Oid indexRelationId)
 	 * this commits and then starts a new transaction immediately.
 	 */
 	ReindexPartitions(indexRelationId, &params, true);
-
-	CommandCounterIncrement();
-	index_set_state_flags(indexRelationId, INDEX_CREATE_SET_VALID);
 }
 
 /*
@@ -3098,6 +3093,24 @@ ReindexPartitions(Oid relid, ReindexParams *params, bool isTopLevel)
 	 */
 	ReindexMultipleInternal(partitions, params);
 
+	/*
+	 * If indexes exist on all of the partitioned table's children, and we
+	 * just reindexed them, then we know they're valid, and so can mark the
+	 * parent index as valid.
+	 * This handles the case of CREATE INDEX CONCURRENTLY.
+	 * See also: validatePartitionedIndex().
+	 */
+	if (get_rel_relkind(relid) == RELKIND_PARTITIONED_INDEX
+			&& !get_index_isvalid(relid))
+	{
+		Oid	tableoid = IndexGetRelation(relid, false);
+		List	*child_tables = find_all_inheritors(tableoid, ShareLock, NULL);
+
+		/* Both lists include their parent relation as well as any intermediate partitioned rels */
+		if (list_length(inhoids) == list_length(child_tables))
+			index_set_state_flags(relid, INDEX_CREATE_SET_VALID);
+	}
+
 	/*
 	 * Clean up working storage --- note we must do this after
 	 * StartTransactionCommand, else we might be trying to delete the active
-- 
2.17.0


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