Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/14620
I've added test cases for all the methods in `ParserUtils`, and made two
small changes in the `ParserUtils` code:
1. Deleted function `command(stream: CharStream)`, merge both `command`
method into `command(ctx: ParserRuleContext)`;
2. In method `position(token: Token)` the input param `token` could be
`null`, so I added branch statement to handle the `token == null` condition.
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