MaxGekk commented on pull request #31499:
URL: https://github.com/apache/spark/pull/31499#issuecomment-779408914
@dongjoon-hyun I have looked at the SQL standard, it uses both notions:
```sql
{ UTF8 | UTF16 | UTF32}
GENERATED { ALWAYS | BY DEFAULT } AS IDENTITY
```
and
```sql
[ INSTANCE | STATIC | CONSTRUCTOR ] METHOD
```
It seems `{alternative1 | alternative2 }` means one of the alternatives must
be specified, `[alternative1 | alternative2]` - both are optional.
I do believe we should use the syntax `MSCK REPAIR TABLE .. [ { ADD | DROP |
SYNC } PARTITIONS ]` in docs/comments.
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