apache
Default storage options for AO tables not persisted to pg_class.reloptions
Issue Description
The system configuration gp_default_storage_options defines several defaults, including blocksize, compresstype, and checksum. However, when an AO table is created with only the WITH (appendonly=true) clause, none of these default values are persisted to the table's metadata in the pg_class.reloptions column. The column remains NULL.
This behavior differs from Greenplum, which correctly persists all applicable defaults from gp_default_storage_options to pg_class.reloptions. Since gp_default_storage_options is a GUC that can be changed at any time, it is critical that the effective storage options at creation time are explicitly recorded in the metadata. The current behavior in Cloudberry leads to a loss of critical metadata, making it impossible to know the table's original storage properties if the GUC is changed later.
Reproduction and Evidence
The following raw psql session logs demonstrate the issue. The session on Cloudberry shows that the default options are not persisted to pg_class.reloptions. The session on Greenplum shows the expected, consistent behavior.
cbdb@robertmu-VirtualBox:~/Projects/cloudberry$ psql
psql (14.4, server 14.4)
Type "help" for help.
cbdb=# select version();
version
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PostgreSQL 14.4 (Apache Cloudberry 2.1.0-devel+dev.2019.g1cc76495e18 build dev) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0, 64-bit compiled on Jul 18 2025 11:29:40
(1 row)
cbdb=#
cbdb=# create table tab_ao(i int) with(appendonly=true);
NOTICE: Table doesn't have 'DISTRIBUTED BY' clause -- Using column named 'i' as the Apache Cloudberry data distribution key for this table.
HINT: The 'DISTRIBUTED BY' clause determines the distribution of data. Make sure column(s) chosen are the optimal data distribution key to minimize skew.
CREATE TABLE
cbdb=#
cbdb=# select oid, relname, reloptions from pg_class where relname = 'tab_ao';
oid | relname | reloptions
-------+---------+------------
21682 | tab_ao |
(1 row)
cbdb=#
cbdb=# show gp_default_storage_options;
gp_default_storage_options
-------------------------------------------------
blocksize=32768,compresstype=none,checksum=true
(1 row)
cbdb=#
gpdb7@robertmu-VirtualBox:~/Projects/gpdb-archive$ psql
psql (12.12)
Type "help" for help.
gpdb7=# select version();
version
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PostgreSQL 12.12 (Greenplum Database 7.0.0-beta.0+482967c1b4 build dev) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0, 64-bit compiled on Nov 8 2024 23:43:47 Bhuvnesh C.
(1 row)
gpdb7=#
gpdb7=# create table tab_ao(i int) with(appendonly=true);
NOTICE: Table doesn't have 'DISTRIBUTED BY' clause -- Using column named 'i' as the Greenplum Database data distribution key for this table.
HINT: The 'DISTRIBUTED BY' clause determines the distribution of data. Make sure column(s) chosen are the optimal data distribution key to minimize skew.
CREATE TABLE
gpdb7=#
gpdb7=# select oid, relname, reloptions from pg_class where relname = 'tab_ao';
oid | relname | reloptions
-------+---------+-------------------------------------------------------------------
18326 | tab_ao | {blocksize=32768,compresslevel=0,compresstype=none,checksum=true}
(1 row)
gpdb7=#
gpdb7=# show gp_default_storage_options;
gp_default_storage_options
-------------------------------------------------
blocksize=32768,compresstype=none,checksum=true
(1 row)
gpdb7=#
Expected Behavior
The reloptions column in pg_class for the tab_ao table should contain all the default storage options (blocksize=32768, compresslevel=0, compresstype=none, checksum=true), as these are the effective defaults set by gp_default_storage_options at the time of creation.
Actual Behavior
The reloptions column in pg_class for the tab_ao table is NULL, indicating that no default storage options were persisted.
Environment
- Cloudberry Version:
PostgreSQL 14.4 (Apache Cloudberry 2.1.0-devel+dev.2019.g1cc76495e18 build dev) - Greenplum Version:
PostgreSQL 12.12 (Greenplum Database 7.0.0-beta.0+482967c1b4 build dev)
