Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/16422#discussion_r125800773
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -262,7 +262,7 @@ describeFuncName
;
describeColName
- : identifier ('.' (identifier | STRING))*
+ : identifier
--- End diff --
That was my previous approach. As @cloud-fan mentioned in
[#discussion_r122347812](https://github.com/apache/spark/pull/16422#discussion_r122347812)
and
[#discussion_r122348197](https://github.com/apache/spark/pull/16422#discussion_r122348197),
it's hard to tell if "col.a" is a qualified name or a nested name, or maybe a
more complex example:
```
`a.b`.`c.d`
```
```
`a.b.c.d`
```
It may be very tricky to deal with such cases. What's your opinion?
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