Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/15346#discussion_r81936312
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -593,6 +593,14 @@ colTypeList
;
colType
+ : identifier dataType (COMMENT STRING)?
+ ;
+
+complexColTypeList
+ : complexColType (',' complexColType)*
+ ;
+
+complexColType
: identifier ':'? dataType (COMMENT STRING)?
--- End diff --
Perhaps we should follow the HIVE way:
```structs: STRUCT<col_name : data_type [COMMENT col_comment], ...>```
It makes the colon required, and also support comment for struct cols.
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