maropu commented on a change in pull request #29202:
URL: https://github.com/apache/spark/pull/29202#discussion_r459353350
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File path: docs/sql-ref-syntax-aux-conf-mgmt-reset.md
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@@ -21,19 +21,34 @@ license: |
### Description
-Reset any runtime configurations specific to the current session which were
set via the [SET](sql-ref-syntax-aux-conf-mgmt-set.html) command to their
default values.
+The RESET command resets runtime configurations specific to the current
session which were set via the [SET](sql-ref-syntax-aux-conf-mgmt-set.html)
command to their default values.
### Syntax
```sql
-RESET
+RESET;
+
+RESET configuration_key;
```
+### Parameters
+
+* **(none)**
+
+ Reset any runtime configurations specific to the current session which
were set via the [SET](sql-ref-syntax-aux-conf-mgmt-set.html) command to their
default values.
+
+* **configuration_key**
+
+ Restore the value of the `configuration_key` to the default value. If the
default value is undefined, the `configuration_key` will be removed.
+
### Examples
```sql
-- Reset any runtime configurations specific to the current session which were
set via the SET command to their default values.
RESET;
+
+-- If you start your application with --conf spark.foo=bar and set
spark.foo=foobar in runtime, the example below will restore it to 'bar'
Review comment:
How about describing a default value case without an user-specified
value, too?
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