HyukjinKwon opened a new pull request #28633:
URL: https://github.com/apache/spark/pull/28633
### What changes were proposed in this pull request?
This PR proposes to set the alias, and class name in its `ExpressionInfo`
for `struct`.
- Class name in `ExpressionInfo`
- from: `org.apache.spark.sql.catalyst.expressions.NamedStruct`
- to:`org.apache.spark.sql.catalyst.expressions.CreateNamedStruct`
- Alias name: `named_struct(col1, v, ...)` -> `struct(v, ...)`
### Why are the changes needed?
To show the correct output name and class names to users.
### Does this PR introduce _any_ user-facing change?
Yes.
**Before:**
```scala
scala> sql("DESC FUNCTION struct").show(false)
+------------------------------------------------------------------------------------+
|function_desc
|
+------------------------------------------------------------------------------------+
|Function: struct
|
|Class: org.apache.spark.sql.catalyst.expressions.NamedStruct
|
|Usage: struct(col1, col2, col3, ...) - Creates a struct with the given
field values.|
+------------------------------------------------------------------------------------+
```
```scala
scala> sql("SELECT struct(1, 2)").show(false)
+------------------------------+
|named_struct(col1, 1, col2, 2)|
+------------------------------+
|[1, 2] |
+------------------------------+
```
**After:**
```scala
scala> sql("DESC FUNCTION struct").show(false)
+------------------------------------------------------------------------------------+
|function_desc
|
+------------------------------------------------------------------------------------+
|Function: struct
|
|Class: org.apache.spark.sql.catalyst.expressions.CreateNamedStruct
|
|Usage: struct(col1, col2, col3, ...) - Creates a struct with the given
field values.|
+------------------------------------------------------------------------------------+
```
```scala
scala> sql("SELECT struct(1, 2)").show(false)
+------------+
|struct(1, 2)|
+------------+
|[1, 2] |
+------------+
```
### How was this patch tested?
Manually tested, and Jenkins tests.
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