Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# PG\_CLASS\_INFO
<a name="r_PG_CLASS_INFO"></a>

PG\_CLASS\_INFO is an Amazon Redshift system view built on the PostgreSQL catalog tables PG\_CLASS and PG\_CLASS\_EXTENDED. PG\_CLASS\_INFO includes details about table creation time and the current distribution style. For more information, see [Data distribution for query optimization](t_Distributing_data.md).

PG\_CLASS\_INFO is visible to all users. Superusers can see all rows; regular users can see only their own data. For more information, see [Visibility of data in system tables and views](cm_chap_system-tables.md#c_visibility-of-data).

## Table columns
<a name="r_PG_CLASS_INFO-table-columns2"></a>

PG\_CLASS\_INFO shows the following columns in addition to the columns in PG\_CLASS. The `oid` column in PG\_CLASS is called `reloid` in the PG\_CLASS\_INFO table.


| Column name  | Data type  | Description  | 
| --- | --- | --- | 
| relcreationtime | timestamp | Time in UTC that the table was created. | 
| releffectivediststyle | integer  | The distribution style of a table or, if the table uses automatic distribution, the current distribution style assigned by Amazon Redshift. | 

The RELEFFECTIVEDISTSTYLE column in PG\_CLASS\_INFO indicates the current distribution style for the table. If the table uses automatic distribution, RELEFFECTIVEDISTSTYLE is 10, 11, or 12, which indicates whether the effective distribution style is AUTO (ALL), AUTO (EVEN), or AUTO (KEY). If the table uses automatic distribution, the distribution style might initially show AUTO (ALL), then change to AUTO (EVEN) when the table grows or AUTO (KEY) if a column is found to be useful as a distribution key. 

The following table gives the distribution style for each value in RELEFFECTIVEDISTSTYLE column: 


| RELEFFECTIVEDISTSTYLE | Current distribution style | 
| --- | --- | 
| 0 | EVEN | 
| 1 | KEY | 
| 8 | ALL | 
| 10 | AUTO (ALL) | 
| 11 | AUTO (EVEN) | 
| 12 | AUTO (KEY) | 

## Example
<a name="r_PG_CLASS_INFO-example"></a>

The following query returns the current distribution style of tables in the catalog. 

```
select reloid as tableid,trim(nspname) as schemaname,trim(relname) as tablename,reldiststyle,releffectivediststyle, 
CASE WHEN "reldiststyle" = 0 THEN 'EVEN'::text 
     WHEN "reldiststyle" = 1 THEN 'KEY'::text 
     WHEN "reldiststyle" = 8 THEN 'ALL'::text 
     WHEN "releffectivediststyle" = 10 THEN 'AUTO(ALL)'::text 
     WHEN "releffectivediststyle" = 11 THEN 'AUTO(EVEN)'::text 
     WHEN "releffectivediststyle" = 12 THEN 'AUTO(KEY)'::text ELSE '<<UNKNOWN>>'::text END as diststyle,relcreationtime 
from pg_class_info a left join pg_namespace b on a.relnamespace=b.oid;
```

```
 tableid | schemaname | tablename | reldiststyle | releffectivediststyle | diststyle  |      relcreationtime       
---------+------------+-----------+--------------+-----------------------+------------+----------------------------
 3638033 | public     | customer  |            0 |                     0 | EVEN       | 2019-06-13 15:02:50.666718
 3638037 | public     | sales     |            1 |                     1 | KEY        | 2019-06-13 15:03:29.595007
 3638035 | public     | lineitem  |            8 |                     8 | ALL        | 2019-06-13 15:03:01.378538
 3638039 | public     | product   |            9 |                    10 | AUTO(ALL)  | 2019-06-13 15:03:42.691611
 3638041 | public     | shipping  |            9 |                    11 | AUTO(EVEN) | 2019-06-13 15:03:53.69192
 3638043 | public     | support   |            9 |                    12 | AUTO(KEY)  | 2019-06-13 15:03:59.120695
(6 rows)
```