Allow replica identity on compressed hypertables

This unblocks the execution of `ALTER TABLE ... REPLICA IDENTITY ...` on
hypertables with compression enabled. The configured replica identity
only propagates to tables belonging to the uncompressed hypertable.

Fixes: timescale#6158

.unreleased/pr_6897

@@ -0,0 +1 @@
+Implements: #6897 Add support for replica identity on compressed hypertables

src/process_utility.c

@@ -232,6 +232,7 @@ check_alter_table_allowed_on_ht_with_compression(Hypertable *ht, AlterTableStmt
 			case AT_ColumnDefault:	/* this is passed down */
 			case AT_DropColumn:		/* this is passed down */
 			case AT_DropConstraint: /* this is passed down */
+			case AT_ReplicaIdentity:
 			case AT_ReAddStatistics:
 			case AT_SetCompression:
 				continue;

tsl/test/expected/compression_ddl.out

@@ -54,6 +54,40 @@ DROP INDEX new_index;
 ALTER TABLE test1 SET (fillfactor=100);
 ALTER TABLE test1 RESET (fillfactor);
 ALTER TABLE test1 ALTER COLUMN b SET STATISTICS 10;
+-- ensure that REPLICA IDENTITY works
+SELECT relreplident, count(*) FROM show_chunks('test1') ch INNER JOIN pg_class c ON (ch = c.oid) GROUP BY 1 ORDER BY 1;
+ relreplident | count 
+--------------+-------
+ d            |    27
+(1 row)
+
+SELECT relreplident FROM pg_class c WHERE c.relname = 'test1';
+ relreplident 
+--------------
+ d
+(1 row)
+
+ALTER TABLE test1 REPLICA IDENTITY FULL;
+SELECT relname, relreplident FROM pg_class WHERE relname = 'test1' ORDER BY relname;
+ relname | relreplident 
+---------+--------------
+ test1   | f
+(1 row)
+
+-- the chunk's setting should also change to FULL
+SELECT relreplident, count(*) FROM show_chunks('test1') ch INNER JOIN pg_class c ON (ch = c.oid) GROUP BY 1 ORDER BY 1;
+ relreplident | count 
+--------------+-------
+ f            |    27
+(1 row)
+
+SELECT relreplident FROM pg_class c WHERE c.relname = 'test1';
+ relreplident 
+--------------
+ f
+(1 row)
+
+ALTER TABLE test1 REPLICA IDENTITY DEFAULT;
 -- make sure we cannot create constraints or unique indexes on compressed hypertables
 \set ON_ERROR_STOP 0
 ALTER TABLE test1 ADD CONSTRAINT c1 UNIQUE(time,i);

tsl/test/sql/compression_ddl.sql

@@ -34,6 +34,16 @@ ALTER TABLE test1 SET (fillfactor=100);
 ALTER TABLE test1 RESET (fillfactor);
 ALTER TABLE test1 ALTER COLUMN b SET STATISTICS 10;
 
+-- ensure that REPLICA IDENTITY works
+SELECT relreplident, count(*) FROM show_chunks('test1') ch INNER JOIN pg_class c ON (ch = c.oid) GROUP BY 1 ORDER BY 1;
+SELECT relreplident FROM pg_class c WHERE c.relname = 'test1';
+ALTER TABLE test1 REPLICA IDENTITY FULL;
+SELECT relname, relreplident FROM pg_class WHERE relname = 'test1' ORDER BY relname;
+-- the chunk's setting should also change to FULL
+SELECT relreplident, count(*) FROM show_chunks('test1') ch INNER JOIN pg_class c ON (ch = c.oid) GROUP BY 1 ORDER BY 1;
+SELECT relreplident FROM pg_class c WHERE c.relname = 'test1';
+ALTER TABLE test1 REPLICA IDENTITY DEFAULT;
+
 -- make sure we cannot create constraints or unique indexes on compressed hypertables
 \set ON_ERROR_STOP 0
 ALTER TABLE test1 ADD CONSTRAINT c1 UNIQUE(time,i);