Hello everyone, I have tested the v4 patch and observed that the following scenario requires support. Accordingly, I have prepared version v5: v5-0001 is fully consistent with the v4 patch, and v5-0002 restricts input to domains exclusively, with an additional simple test case attached.
```sql
postgres=# create table test_table(a int);
CREATE TABLE
postgres=# SELECT pg_get_domain_ddl('test_table');
ERROR: cache lookup failed for type 0
```
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Regrads,
Man Zeng
v5-0001-Add-pg_get_domain_ddl-function-to-reconstruct-CRE.patch
Description: Binary data
v5-0002-Add-pg_get_domain_ddl-function-to-reconstruct-CRE.patch
Description: Binary data
