delete: add using clause, possibility of using aliases

[mobuchowski]

PostgreSQL and MySQL have possibility of using aliases in DELETE statements.

PostgreSQL and Snowflake have USING clause.

Signed-off-by: Maciej Obuchowski obuchowski.maciej@gmail.com

[coveralls]

Pull Request Test Coverage Report for Build 2671290535

• 52 of 53 (98.11%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 89.93%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tests/sqlparser_common.rs	44	45	97.78%

Files with Coverage Reduction	New Missed Lines	%
tests/sqlparser_common.rs	1	97.16%

Totals
Change from base Build 2631347546:	0.04%
Covered Lines:	8922
Relevant Lines:	9921

---

💛 - Coveralls

[alamb]

Thank you @mobuchowski -- looking good. I think this PR just needs one more test

[alamb]

Can you please add a positive test for using as well (aka a query that has a USING clause)?

[mobuchowski]

@alamb I added it few lines below already: https://github.com/sqlparser-rs/sqlparser-rs/pull/541/files#diff-ae2dab2c924f4018c1daf0743b8fd912c44c5b63ae7144dd8b951bb3bd254349R305

Unless you mean something else? Like, more complex TableFactor?

[alamb]

No this is fine -- I just wanted to add some coverage so that we didn't accidentally break the functionality in the future but have all the tests pass

[alamb]

No this is fine -- I just wanted to add some coverage so that we didn't accidentally break the functionality in the future but have all the tests pass

[alamb]

Thanks again @mobuchowski