Fix recompress segmentwise when order by is empty, avoid test recaps

.unreleased/pr_7789

@@ -0,0 +1,2 @@
+Implements: #7789 Do not recompress segmentwise when default order by is empty
+Fixes: #7748 Crash in the segmentwise recompression

tsl/src/compression/create.c

@@ -1143,10 +1143,10 @@ compression_setting_orderby_get_default(Hypertable *ht, ArrayType *segmentby)
 		orderby = "";
 
 	if (*orderby == '\0')
-		elog(NOTICE,
-			 "default order by for hypertable \"%s\" is empty, segmentwise recompression will be "
-			 "disabled",
-			 get_rel_name(ht->main_table_relid));
+		ereport(NOTICE,
+				(errmsg("default order by for hypertable \"%s\" is set to \"\"",
+						get_rel_name(ht->main_table_relid))),
+				errdetail("Segmentwise recompression will be disabled"));
 	else
 		elog(NOTICE,
 			 "default order by for hypertable \"%s\" is set to \"%s\"",

tsl/src/compression/recompress.c

@@ -18,6 +18,7 @@
 #include "compression.h"
 #include "compression_dml.h"
 #include "create.h"
+#include "debug_assert.h"
 #include "guc.h"
 #include "hypercore/hypercore_handler.h"
 #include "hypercore/utils.h"
@@ -123,7 +124,7 @@ recompress_chunk_segmentwise_impl(Chunk *uncompressed_chunk)
 
 	/* We should not do segment-wise recompression with empty orderby, see #7748
 	 */
-	Assert(settings->fd.orderby);
+	Ensure(settings->fd.orderby, "empty order by, cannot recompress segmentwise");
 
 	/* new status after recompress should simply be compressed (1)
 	 * It is ok to update this early on in the transaction as it keeps a lock

tsl/test/expected/compression.out

@@ -1147,10 +1147,10 @@ SELECT create_hypertable('table1','col1', chunk_time_interval => 10);
 
 -- Trying to list an incomplete set of fields of the compound key
 ALTER TABLE table1 SET (timescaledb.compress, timescaledb.compress_segmentby = 'col1');
-NOTICE:  default order by for hypertable "table1" is empty, segmentwise recompression will be disabled
+NOTICE:  default order by for hypertable "table1" is set to ""
 -- Listing all fields of the compound key should succeed:
 ALTER TABLE table1 SET (timescaledb.compress, timescaledb.compress_segmentby = 'col1,col2');
-NOTICE:  default order by for hypertable "table1" is empty, segmentwise recompression will be disabled
+NOTICE:  default order by for hypertable "table1" is set to ""
 SELECT * FROM timescaledb_information.compression_settings ORDER BY hypertable_name;
  hypertable_schema | hypertable_name |   attname   | segmentby_column_index | orderby_column_index | orderby_asc | orderby_nullsfirst 
 -------------------+-----------------+-------------+------------------------+----------------------+-------------+--------------------

tsl/test/expected/compression_defaults.out

@@ -374,7 +374,7 @@ SELECT _timescaledb_functions.get_orderby_defaults('table1', ARRAY['col1']::text
 (1 row)
 
 ALTER TABLE table1 SET (timescaledb.compress, timescaledb.compress_segmentby = 'col1');
-NOTICE:  default order by for hypertable "table1" is empty, segmentwise recompression will be disabled
+NOTICE:  default order by for hypertable "table1" is set to ""
 SELECT * FROM _timescaledb_catalog.compression_settings;
  relid  | compress_relid | segmentby | orderby | orderby_desc | orderby_nullsfirst 
 --------+----------------+-----------+---------+--------------+--------------------

tsl/test/expected/compression_errors-17.out

@@ -876,7 +876,7 @@ ALTER TABLE table_unique_index SET (timescaledb.compress = off);
 ALTER TABLE table_unique_index SET (timescaledb.compress, timescaledb.compress_segmentby = 'time,location', timescaledb.compress_orderby = 'device_id');
 ALTER TABLE table_unique_index SET (timescaledb.compress = off);
 ALTER TABLE table_unique_index SET (timescaledb.compress, timescaledb.compress_segmentby = 'time,location,device_id');
-NOTICE:  default order by for hypertable "table_unique_index" is empty, segmentwise recompression will be disabled
+NOTICE:  default order by for hypertable "table_unique_index" is set to ""
 ALTER TABLE table_unique_index SET (timescaledb.compress = off);
 -- try compressing osm chunk
 CREATE TABLE osm_table (time timestamptz NOT NULL, device_id text, value float);

tsl/test/expected/compression_fks.out

@@ -13,7 +13,7 @@ NOTICE:  adding not-null constraint to column "time"
 
 ALTER TABLE ht_with_fk ADD CONSTRAINT keys FOREIGN KEY (time) REFERENCES keys(time) ON DELETE CASCADE;
 ALTER TABLE ht_with_fk SET (timescaledb.compress,timescaledb.compress_segmentby='time');
-NOTICE:  default order by for hypertable "ht_with_fk" is empty, segmentwise recompression will be disabled
+NOTICE:  default order by for hypertable "ht_with_fk" is set to ""
 -- no keys added yet so any insert into ht_with_fk should fail
 \set ON_ERROR_STOP 0
 INSERT INTO ht_with_fk SELECT '2000-01-01';

tsl/test/expected/compression_update_delete-17.out

@@ -464,7 +464,7 @@ SELECT * FROM create_hypertable('sample_table', 'time', chunk_time_interval => 1
 ALTER TABLE sample_table SET (
     timescaledb.compress,
     timescaledb.compress_segmentby = 'time, val');
-NOTICE:  default order by for hypertable "sample_table" is empty, segmentwise recompression will be disabled
+NOTICE:  default order by for hypertable "sample_table" is set to ""
 INSERT INTO sample_table VALUES (1, 1, 1), (2, 2, 1), (3, 3, 1), (1, 3, 2), (11, 4, 2), (1, 1, 2);
 -- compress all chunks
 SELECT compress_chunk(show_chunks('sample_table'));
@@ -588,7 +588,7 @@ INSERT INTO sample_table VALUES ('2017-03-22T09:18:22', 23.5, 1, '{"a": 1, "b":
                                 ('2017-08-22T09:18:22', 34.1, 3, '{"c": 4}');
 ALTER TABLE sample_table SET (timescaledb.compress,
                               timescaledb.compress_segmentby = 'time');
-NOTICE:  default order by for hypertable "sample_table" is empty, segmentwise recompression will be disabled
+NOTICE:  default order by for hypertable "sample_table" is set to ""
 SELECT compress_chunk(show_chunks('sample_table'));
              compress_chunk              
 -----------------------------------------

tsl/test/expected/recompress_chunk_segmentwise.out

@@ -656,8 +656,11 @@ NOTICE:  adding not-null constraint to column "ts"
  (20,public,no_oby,t)
 (1 row)
 
+\set VERBOSITY default
 ALTER TABLE no_oby SET (timescaledb.compress, timescaledb.compress_segmentby = 'ts');
-NOTICE:  default order by for hypertable "no_oby" is empty, segmentwise recompression will be disabled
+NOTICE:  default order by for hypertable "no_oby" is set to ""
+DETAIL:  Segmentwise recompression will be disabled
+\set VERBOSITY terse
 INSERT INTO no_oby (ts,c1) VALUES (6,6);
 SELECT show_chunks as chunk_to_compress FROM show_chunks('no_oby') LIMIT 1 \gset
 SELECT compress_chunk(:'chunk_to_compress');

tsl/test/sql/recompress_chunk_segmentwise.sql

@@ -310,7 +310,9 @@ SELECT compress_chunk(:'chunk_to_compress');
 -- Test behaviour when default order by is empty: should not segmentwise-recompress in this case
 CREATE TABLE no_oby(ts int, c1 int);
 SELECT create_hypertable('no_oby','ts');
+\set VERBOSITY default
 ALTER TABLE no_oby SET (timescaledb.compress, timescaledb.compress_segmentby = 'ts');
+\set VERBOSITY terse
 
 INSERT INTO no_oby (ts,c1) VALUES (6,6);
 SELECT show_chunks as chunk_to_compress FROM show_chunks('no_oby') LIMIT 1 \gset