Add support for MSSQL's OPENJSON WITH clause

[gaoqiangz]

Resolves issue #1494

[lovasoa]

No blocker for me ! This would be of great use for us at SQLPage, where the use of sql json functions is common.

[lovasoa]

You may want to update the comments below too.

[iffyio]

Yeah to @lovasoa's suggestion, one double check on my end @gaoqiangz is the parenthesis around the joined table supported syntax for the openjson syntax? Thinking if its not, then we would be able to skip this change entirely. If it is then indeed lets update the comments to account for mssql.
Additionally, can we add a test case covering the behavior (as in a roundtrip test like SELECT ... FROM T AS A CROSS APPLY (OPENJSON(...) WITH ...) AS B so that we catch any regression on the behavior going forward

[gaoqiangz]

I have checked that MSSQL doesn't support parenthesis around the openjson syntax.
I'll revert this change.

[iffyio]

Yeah to @lovasoa's suggestion, one double check on my end @gaoqiangz is the parenthesis around the joined table supported syntax for the openjson syntax? Thinking if its not, then we would be able to skip this change entirely. If it is then indeed lets update the comments to account for mssql.
Additionally, can we add a test case covering the behavior (as in a roundtrip test like SELECT ... FROM T AS A CROSS APPLY (OPENJSON(...) WITH ...) AS B so that we catch any regression on the behavior going forward

[iffyio]

LGTM! cc @alamb

[coveralls]

Pull Request Test Coverage Report for Build 11716305539

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 264 of 303 (87.13%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 89.376%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/ast/query.rs	20	22	90.91%
src/parser/mod.rs	38	41	92.68%
tests/sqlparser_mssql.rs	206	240	85.83%

Files with Coverage Reduction	New Missed Lines	%
src/ast/query.rs	1	86.43%

Totals
Change from base Build 11712467818:	-0.02%
Covered Lines:	30876
Relevant Lines:	34546

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💛 - Coveralls

[alamb]

🚀