Support use of BY NAME quantifier across all set ops

[alexander-beedie]

It turns out that that use of the "BY NAME" quantifier was being artificially constrained to UNION set ops - however, there are dialects that allow it for all set ops (which actually makes a lot of sense).

I'm about to implement this additional "BY NAME" set op support for the Polars SQL interface (which will need this patch), but the expanded usage is already found in the wild; see Microsoft's U-SQL dialect (as used in Azure Data Lake Analytics) for an example:

• EXCEPT [BY NAME]: https://learn.microsoft.com/en-gb/archive/usql/statements-and-expressions/set-rowset/except-expression
• INTERSECT [BY NAME]: https://learn.microsoft.com/en-gb/archive/usql/statements-and-expressions/set-rowset/intersect-expression

Also:

• Spotted a missing backtick in the docs - added.
• Fixed some minor typos in comments/docstrings.
• Added a note to the README that polars also uses the parser 👍

[coveralls]

Pull Request Test Coverage Report for Build 9478220409

Details

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 88.878%

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Files with Coverage Reduction	New Missed Lines	%
src/parser/mod.rs	1	93.09%

Totals
Change from base Build 9439708625:	0.0%
Covered Lines:	26259
Relevant Lines:	29545

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9481344190

Details

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 88.878%

---

Files with Coverage Reduction	New Missed Lines	%
src/parser/mod.rs	1	93.09%

Totals
Change from base Build 9439708625:	0.0%
Covered Lines:	26259
Relevant Lines:	29545

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9481781619

Details

• 8 of 8 (100.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 88.878%

---

Files with Coverage Reduction	New Missed Lines	%
src/parser/mod.rs	1	93.09%

Totals
Change from base Build 9439708625:	0.0%
Covered Lines:	26259
Relevant Lines:	29545

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9482850329

Details

• 8 of 8 (100.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 88.878%

---

Files with Coverage Reduction	New Missed Lines	%
src/parser/mod.rs	1	93.09%

Totals
Change from base Build 9439708625:	0.0%
Covered Lines:	26259
Relevant Lines:	29545

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9482845468

Details

• 8 of 8 (100.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 88.878%

---

Files with Coverage Reduction	New Missed Lines	%
src/parser/mod.rs	1	93.09%

Totals
Change from base Build 9439708625:	0.0%
Covered Lines:	26259
Relevant Lines:	29545

---

💛 - Coveralls

[jmhain]

lgtm, many thanks for the typo cleanups! cc @alamb

[coveralls]

Pull Request Test Coverage Report for Build 9487455051

Details

• 8 of 8 (100.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage remained the same at 88.878%

---

Files with Coverage Reduction	New Missed Lines	%
src/parser/mod.rs	1	93.09%

Totals
Change from base Build 9439708625:	0.0%
Covered Lines:	26259
Relevant Lines:	29545

---

💛 - Coveralls

[alamb]

Thank you @jmhain and @alexander-beedie

[alamb]

🎉