Description

• IAM walk chunk planning: Adds a fast physloc-boundary planner using sys.dm_db_database_page_allocations (LIMITED) to stream (file_id, page_id) and generate page-aligned %%physloc%% chunks without scanning/sorting the table; used when supported (SQL Server 2012+ + VIEW DATABASE STATE, not Azure SQL DB/MI).

• Sampling fallback + shared abstraction: When IAM walk is unavailable/fails, adds TABLESAMPLE SYSTEM + %%physloc%% sampling to estimate evenly-spaced boundaries using only SELECT permission; the sampling % calculation and clamp constants are shared across MSSQL + Oracle.

Dependencies / requirements:

• SQL Server 2012+, VIEW DATABASE STATE permission, and not Azure SQL DB/MI for IAM-walk planning.
• Existing strategies remain as fallback when IAM-walk is unavailable.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Scenario A: MSSQL sync with IAM-walk enabled
• Scenario B: IAM-walk unsupported (capability/permission/platform) falls back cleanly
  • Remove/deny VIEW DATABASE STATE (or run on Azure SQL DB/MI) and re-run the same sync.
  • Verify logs show fallback to existing strategy and sync proceeds.

Screenshots or Recordings

Documentation

• Documentation Link: [link to README, olake.io/docs, or olake-docs]
• N/A (bug fix, refactor, or test changes only)

Related PR's (If Any):