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: #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 +54,48 @@ 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
+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 relname, relreplident FROM show_chunks('test1') ch INNER JOIN pg_class c ON (ch = c.oid) ORDER BY relname;
+ relname | relreplident 
+-------------------+--------------
+ _hyper_1_10_chunk | f
+ _hyper_1_11_chunk | f
+ _hyper_1_12_chunk | f
+ _hyper_1_13_chunk | f
+ _hyper_1_14_chunk | f
+ _hyper_1_15_chunk | f
+ _hyper_1_16_chunk | f
+ _hyper_1_17_chunk | f
+ _hyper_1_18_chunk | f
+ _hyper_1_19_chunk | f
+ _hyper_1_1_chunk | f
+ _hyper_1_20_chunk | f
+ _hyper_1_21_chunk | f
+ _hyper_1_22_chunk | f
+ _hyper_1_23_chunk | f
+ _hyper_1_24_chunk | f
+ _hyper_1_25_chunk | f
+ _hyper_1_26_chunk | f
+ _hyper_1_27_chunk | f
+ _hyper_1_2_chunk | f
+ _hyper_1_3_chunk | f
+ _hyper_1_4_chunk | f
+ _hyper_1_5_chunk | f
+ _hyper_1_6_chunk | f
+ _hyper_1_7_chunk | f
+ _hyper_1_8_chunk | f
+ _hyper_1_9_chunk | f
+(27 rows)
+
+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 +34,13 @@ 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
+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 relname, relreplident FROM show_chunks('test1') ch INNER JOIN pg_class c ON (ch = c.oid) ORDER BY relname;
+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);