Yikf opened a new pull request #35564:
URL: https://github.com/apache/spark/pull/35564
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### What changes were proposed in this pull request?
This pr aims to unify the out of df.explain and "explain" sql if plan is a
command
unify the out of df.explain and "explain" sql if plan is a command
Make the output of explain unambiguous if plan is a command
Lets say have a query like "show tables", we want to explain it -> sql("show
tables").explain("extended")
**Before this pr:**
```
== Parsed Logical Plan ==
'ShowTables [namespace#62, tableName#63, isTemporary#64]
+- 'UnresolvedNamespace
== Analyzed Logical Plan ==
namespace: string, tableName: string, isTemporary: boolean
ShowTablesCommand default, [namespace#62, tableName#63, isTemporary#64],
false
== Optimized Logical Plan ==
CommandResult [namespace#62, tableName#63, isTemporary#64], Execute
ShowTablesCommand, [[default,lt,false], [default,people,false],
[default,person,false], [default,rt,false], [default,t,false],
[default,t1,false], [default,t10086,false], [default,txtsource,false]]
+- ShowTablesCommand default, [namespace#62, tableName#63,
isTemporary#64], false
== Physical Plan ==
CommandResult [namespace#62, tableName#63, isTemporary#64]
+- Execute ShowTablesCommand
+- ShowTablesCommand default, [namespace#62, tableName#63,
isTemporary#64], false
```
**After this pr:**
```
== Parsed Logical Plan ==
'ShowTables [namespace#0, tableName#1, isTemporary#2]
+- 'UnresolvedNamespace
== Analyzed Logical Plan ==
namespace: string, tableName: string, isTemporary: boolean
ShowTables [namespace#0, tableName#1, isTemporary#2]
+- ResolvedNamespace V2SessionCatalog(spark_catalog), [default]
== Optimized Logical Plan ==
ShowTables [namespace#0, tableName#1, isTemporary#2]
+- ResolvedNamespace V2SessionCatalog(spark_catalog), [default]
== Physical Plan ==
ShowTables [namespace#0, tableName#1, isTemporary#2],
V2SessionCatalog(spark_catalog), [default]
```
### Why are the changes needed?
Make the output of `df.explain` unambiguous
### Does this PR introduce _any_ user-facing change?
Yes, improve the out of `df.explain`
### How was this patch tested?
add test
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