Issue_31559 MySQL parsing

[Yash-cor]

Fixes #31559 .

Changes proposed in this pull request:

No grammar change was required
All the queries that were stated in this were working correctly
Included the test case in xml format as asked in the issue.

Test cases included for MySQL are as follows:

• NAME_CONST()
• NOT IN()
• NOT LIKE
• NOT REGEXP
• NOW()
• NTH_VALUE()
• NTILE()
• NULLIF()
• OCT()
• OCTET_LENGTH()
• ORD()
• PERCENT_RANK()
• PERIOD_ADD()
• PERIOD_DIFF()
• PI()

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• I have added corresponding unit tests for my changes.
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[strongduanmu]

Good job, merged.

[strongduanmu]

Hi @Yash-cor, can you comment on the issue? I will assign it to you.