Github user ericsahit commented on a diff in the pull request:
https://github.com/apache/spark/pull/18268#discussion_r124445231
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/SetCommand.scala
---
@@ -150,12 +150,21 @@ object SetCommand {
* This command is for resetting SQLConf to the default values. Command
that runs
* {{{
* reset;
+ * reset key;
+ * reset key1 key2 ...;
* }}}
*/
-case object ResetCommand extends RunnableCommand with Logging {
+case class ResetCommand(key: Option[String]) extends RunnableCommand with
Logging {
override def run(sparkSession: SparkSession): Seq[Row] = {
- sparkSession.sessionState.conf.clear()
+ key match {
+ case None =>
+ sparkSession.sessionState.conf.clear()
+ // "RESET key" clear a specific property.
+ case Some(key) =>
+ key.split("\\s+")
--- End diff --
OK, i plan adding `Quoted Identifiers` support for such special situation,
after all Quote symbol will be the only `special delimiter`. final use case
like this:
```
spark-sql> set a b=1;
key value
a b 1
Time taken: 0.018 seconds, Fetched 1 row(s)
spark-sql> set c d=2;
key value
c d 2
Time taken: 0.018 seconds, Fetched 1 row(s)
spark-sql> reset a b c d;
Time taken: 0.01 seconds
spark-sql> set a b;
key value
a b 1
spark-sql> reset `a b` `c d`;
Time taken: 0.01 seconds
spark-sql> set a b;
key value
a b <undefined>
Time taken: 0.016 seconds, Fetched 1 row(s)
spark-sql> set c d;
key value
c d <undefined>
spark-sql> reset `a b;
Error in query: Invalid usage of '`' in expression;
```
I though we should open another issue,
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