HPCC-35542 Add comprehensive tests for index fileposition options

[ghalliday]

Type of change:

• This change is a bug fix (non-breaking change which fixes an issue).
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• This change alters the query API (existing queries will have to be recompiled)

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Testing:

[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-35542

Jirabot Action Result:
Changing assignee from: stuart.ort@lexisnexisrisk.com to: gavin.halliday@lexisnexisrisk.com
Workflow Transition To: Merge Pending
Updated PR

[Copilot]

Pull request overview

This pull request adds comprehensive regression tests for index fileposition options in ECL. The tests verify that indices with various combinations of fileposition configurations (enabled/disabled, zero/non-zero) work correctly across different compression types and record structures.

Key changes:

• Tests 36 different combinations of index fileposition configurations
• Covers 3 compression types (legacy, inplace, hybrid), 2 record types (fixed and variable width), and 2 index definition methods (from dataset and from record)
• Validates that data read from indices matches the original source data

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
testing/regress/ecl/indexfilepos.ecl	New comprehensive test file for index fileposition options across multiple configuration combinations
testing/regress/ecl/key/indexfilepos.xml	Expected output file (two empty result datasets indicating successful test completion)

[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-35542

Jirabot Action Result:
Workflow Transition To: Merge Pending

[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-35542

Jirabot Action Result:
Workflow Transition To: Merge Pending