Add Ion Scan

[jpschorr]

This PR builds on #540, #542, & #543 and adds an ion_scan that reads boxed ion variants.

There are still todos and some additional test failures that will be addressed by future PRs that add functionality.

To see the ultimate end-point of this integration, refer to #536 and note the test coverage and conformance test results.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

Conformance comparison report

	Base (b970752)	a93e62f	+/-
% Passing	87.14%	87.15%	0.02%
✅ Passing	5602	5603	1
❌ Failing	827	826	-1
🔶 Ignored	0	0	0
Total Tests	6429	6429	0

Number passing in both: 5602

Number failing in both: 826

Number passing in Base (b970752) but now fail: 0

Number failing in Base (b970752) but now pass: 1

The following test(s) were previously failing but now pass. Before merging, confirm they are intended to pass:

Click here to see

• partiql_tests::eval::primitives::path::path::path::permissive_path_index_bag_literal

[codecov]

Codecov Report

Attention: Patch coverage is 61.53846% with 120 lines in your changes missing coverage. Please review.

Project coverage is 80.01%. Comparing base (b970752) to head (5deb50e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
extension/partiql-extension-ion/src/boxed_ion.rs	50.57%	39 Missing and 4 partials ⚠️
...on/partiql-extension-ion-functions/src/read_ion.rs	69.35%	14 Missing and 5 partials ⚠️
partiql-value/src/datum.rs	13.63%	19 Missing ⚠️
...on/partiql-extension-ion-functions/src/scan_ion.rs	71.42%	14 Missing and 4 partials ⚠️
...tension/partiql-extension-ion-functions/src/lib.rs	52.38%	8 Missing and 2 partials ⚠️
partiql-eval/src/eval/expr/base_table.rs	73.33%	4 Missing ⚠️
partiql-value/src/value/iter.rs	55.55%	4 Missing ⚠️
...sion/partiql-extension-ion-functions/src/buffer.rs	93.33%	1 Missing ⚠️
...nsion/partiql-extension-value-functions/src/lib.rs	50.00%	1 Missing ⚠️
partiql-logical-planner/src/typer.rs	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (61.53%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #544      +/-   ##
==========================================
- Coverage   80.12%   80.01%   -0.11%     
==========================================
  Files          95       98       +3     
  Lines       20581    20630      +49     
  Branches    20581    20630      +49     
==========================================
+ Hits        16490    16508      +18     
- Misses       3648     3670      +22     
- Partials      443      452       +9     

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[alancai98]

Is there an easy way to remove this clone in this PR?

[jpschorr]

No

[alancai98]

I'm curious where do these header vars come from? Could include some comments explaining where they come from. Similarly in read_ion.rs

[jpschorr]

I'll add comments to the code.

Cf. https://datatracker.ietf.org/doc/html/rfc1952#page-6 section 2.3.1
Cf. https://datatracker.ietf.org/doc/rfc8478/ section 3.1.1

[alancai98]

Suggested change

	/// Ion Stream Error
	/// Ion Read Error