saygoodbyye commented on issue #1422:
URL: https://github.com/apache/age/issues/1422#issuecomment-1844718255
@jrgemignani
As documentation says "pg_upgrade allows data stored in PostgreSQL data
files to be upgraded to a later PostgreSQL major version without the data
dump/restore typically required for major version upgrades."
To demonstrate a typical situation when upgrading from one major edition of
PostgreSQL to another, I wrote the following scripts.
The essence of the work is that we install PostgreSQL 14 along with Age
(PG14 branch) and then run data.sql to add some AGE graphs.
**start14.sh:**
```bash
killall postgres
export PGDATA=/tmp/REL_14_STABLE/data
export PG=/tmp/REL_14_STABLE
export PATH=$PG/bin:$PATH
rm -rf $PG
cd postgres
make distclean >/dev/null
git clean -dfx >/dev/null
git checkout REL_14_STABLE
./configure --enable-cassert --enable-tap-tests --enable-debug --prefix=$PG
--quiet
make -j$(nproc) -s install && make -j$(nproc) -s -C contrib install
cd age
make distclean >/dev/null
git clean -dfx >/dev/null
git checkout PG14
make -j$(nproc) install
initdb -D $PGDATA
pg_ctl -l logfile start
createdb $USER
psql -d $USER -f data.sql
pg_ctl stop
```
**data.sql:**
```sql
CREATE EXTENSION age;
SET search_path TO ag_catalog;
SELECT * FROM create_graph('ag_graph_1');
SELECT * FROM create_graph('ag_graph_2');
SELECT * FROM create_graph('ag_graph_3');
SELECT create_vlabel('agload_test_graph1','Country1');
SELECT create_vlabel('agload_test_graph2','Country2');
SELECT * FROM create_complete_graph('gp1',5,'edges','vertices');
SELECT * FROM create_complete_graph('gp2',5,'edges');
```
The second script installs PostgreSQL 15 along with Age (PG15 branch).
**start15.sh:**
```bash
export PG_old=/tmp/REL_14_STABLE
export PG=/tmp/REL_15_STABLE
export PATH=$PG/bin:$PATH
export PGDATA_old=/tmp/REL_14_STABLE/data
export PGDATA=/tmp/REL_15_STABLE/data
rm -rf $PG
cd postgres
make distclean >/dev/null
git clean -dfx >/dev/null
git checkout REL_15_STABLE
./configure --enable-cassert --enable-tap-tests --enable-debug --prefix=$PG
--quiet
make -j$(nproc) -s install && make -j$(nproc) -s -C contrib install
cd age
make distclean >/dev/null
git clean -dfx >/dev/null
git checkout PG15
make -j$(nproc) install
initdb -D $PGDATA
pg_upgrade -d $PGDATA_old -D $PGDATA -b $PG_old/bin -B $PG/bin
```
Next, we run pg_upgrade from version 14 to version 15, but we get an error
when upgrading. This is wrong behavior.
**Upgrade results:**
```log
Performing Consistency Checks
-----------------------------
Checking cluster versions ok
Checking database user is the install user ok
Checking database connection settings ok
Checking for prepared transactions ok
Checking for system-defined composite types in user tables ok
Checking for reg* data types in user tables fatal
Your installation contains one of the reg* data types in user tables.
These data types reference system OIDs that are not preserved by
pg_upgrade, so this cluster cannot currently be upgraded. You can
drop the problem columns and restart the upgrade.
A list of the problem columns is in the file:
/tmp/REL_15_STABLE/data/pg_upgrade_output.d/20231207T124124.859/tables_using_reg.txt
Failure, exiting
```
**Upgrade log:**
```log
In database: test
ag_catalog.ag_graph_namespace_index.namespace
ag_catalog.ag_graph.namespace
```
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