This problem was introduced by
<https://issues.apache.org/jira/browse/SPARK-16826> which is designed to
improve performance of PARSE_URL().
The same issue exists in the following SQL:
```SQL
SELECT PARSE_URL('http://stanzhai.site?p=["abc";]', 'QUERY', 'p')
// return null in Spark 2.1+
// return ["abc"] less than Spark 2.1
```
I think it's a regression.
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