Adds UNPIVOT, LIMIT, and OFFSET to partiql-eval

[rchowell]

Description

This adds UNPIVOT, LIMIT, and OFFSET to partiql-eval. We will need to update LIMIT and OFFSET to use the upvalues introduced in John's correlated subquery PR.

Other Information

• Updated Unreleased Section in CHANGELOG: [YES/NO]
  N/A

• Any backward-incompatible changes? [YES/NO]
  No

• Any new external dependencies? [YES/NO]

  • < If YES, which ones and why? >
  • < In addition, please also mention any other alternatives you've considered and the reason they've been discarded >
    No

• Do your changes comply with the Contributing Guidelines
  and Code Style Guidelines? [YES/NO]
  Yes

License Information

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (partiql-eval@c8f9060). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff               @@
##             partiql-eval    #1364   +/-   ##
===============================================
  Coverage                ?   50.32%           
  Complexity              ?     1045           
===============================================
  Files                   ?      165           
  Lines                   ?    13129           
  Branches                ?     2452           
===============================================
  Hits                    ?     6607           
  Misses                  ?     5862           
  Partials                ?      660           

Flag	Coverage Δ
CLI	13.77% <0.00%> (?)
EXAMPLES	80.28% <0.00%> (?)
LANG	54.71% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

Conformance comparison report-Cross Engine

	Base (legacy)	eval	+/-
% Passing	92.47%	55.12%	-37.35%
✅ Passing	5380	3207	-2173
❌ Failing	438	2611	2173
🔶 Ignored	0	0	0
Total Tests	5818	5818	0
Number passing in both: 3204

Number failing in both: 435

Number passing in legacy engine but fail in eval engine: 2176

Number failing in legacy engine but pass in eval engine: 3
⁉️ CONFORMANCE REPORT REGRESSION DETECTED ⁉️
The complete list can be found in GitHub CI summary, either from Step Summary or in the Artifact.
The following test(s) are failing in legacy but pass in eval. Before merging, confirm they are intended to pass:

Click here to see

• missing and true, compileOption: PERMISSIVE

• nullif valid cases{first:"missing",second:"missing",result:missing}, compileOption: PERMISSIVE

• nullif valid cases{first:"missing",second:"missing",result:missing}, compileOption: LEGACY

Conformance comparison report-Cross Commit-LEGACY

	Base (c8f9060)	be3daf6	+/-
% Passing	92.47%	92.47%	0.00%
✅ Passing	5380	5380	0
❌ Failing	438	438	0
🔶 Ignored	0	0	0
Total Tests	5818	5818	0
Number passing in both: 5380

Number failing in both: 438

Number passing in Base (c8f9060) but now fail: 0

Number failing in Base (c8f9060) but now pass: 0

Conformance comparison report-Cross Commit-EVAL

	Base (c8f9060)	be3daf6	+/-
% Passing	54.86%	55.12%	0.26%
✅ Passing	3192	3207	15
❌ Failing	2626	2611	-15
🔶 Ignored	0	0	0
Total Tests	5818	5818	0
Number passing in both: 3192

Number failing in both: 2611

Number passing in Base (c8f9060) but now fail: 0

Number failing in Base (c8f9060) but now pass: 15
15 test(s) were previously failing but now pass. Before merging, confirm they are intended to pass
The complete list can be found in GitHub CI summary, either from Step Summary or in the Artifact.