wangyum commented on a change in pull request #31504:
URL: https://github.com/apache/spark/pull/31504#discussion_r571756745
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveTableValuedFunctions.scala
##########
@@ -103,6 +106,46 @@ object ResolveTableValuedFunctions extends
Rule[LogicalPlan] {
"numPartitions" -> IntegerType) {
case Seq(start: Long, end: Long, step: Long, numPartitions: Int) =>
Range(start, end, step, Some(numPartitions))
+ }),
+
+ "show_namespaces" -> Map(
+ /* show_namespaces() */
Review comment:
This implementation will add a lot of TVFs. How about just add one TVF,
something like this:
```sql
SELECT * FROM SELECT_FROM_COMMAND('show_namespaces') WHERE identifier='a'
AND pattern = 'b';
```
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