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andygrove merged 1 commit into from
Oct 14, 2022
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MINOR: Document SHOW ALL in the users guide #3826

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23 changes: 21 additions & 2 deletions docs/source/user-guide/sql/information_schema.md
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ views of the ISO SQL `information_schema` schema or the DataFusion specific `SHO

To show tables in the DataFusion catalog, use the `SHOW TABLES` command or the `information_schema.tables` view:

```text
```sql
> show tables;
or
> select * from information_schema.tables;
Expand All @@ -41,7 +41,7 @@ or

To show the schema of a table in DataFusion, use the `SHOW COLUMNS` command or the `information_schema.columns` view:

```text
```sql
> show columns from t;
or
> select table_catalog, table_schema, table_name, column_name, data_type, is_nullable from information_schema.columns;
Expand All @@ -51,3 +51,22 @@ or
| datafusion | public | t1 | Int64(1) | Int64 | NO |
+---------------+--------------+------------+-------------+-----------+-------------+
```

To show the current session configuration options, use the `SHOW ALL` command or the `information_schema.df_settings` view:

```sql
❯ select * from information_schema.df_settings;

+-------------------------------------------------+---------+
| name | setting |
+-------------------------------------------------+---------+
| datafusion.execution.batch_size | 8192 |
| datafusion.execution.coalesce_batches | true |
| datafusion.execution.coalesce_target_batch_size | 4096 |
| datafusion.execution.time_zone | UTC |
| datafusion.explain.logical_plan_only | false |
| datafusion.explain.physical_plan_only | false |
| datafusion.optimizer.filter_null_join_keys | false |
| datafusion.optimizer.skip_failed_rules | true |
+-------------------------------------------------+---------+
```