feat: add support for UUID and PG_UUID types across Spanner migration utilities.

[pratickchokhani]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.57%. Comparing base (65d422a) to head (6039a06).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
.../v2/spanner/migrations/avro/AvroToValueMapper.java	66.66%	2 Missing ⚠️
...m/google/cloud/teleport/v2/spanner/ddl/Column.java	87.50%	1 Missing ⚠️
...eport/v2/templates/transforms/AssignShardIdFn.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3905      +/-   ##
============================================
- Coverage     55.59%   55.57%   -0.02%     
- Complexity     7052     7056       +4     
============================================
  Files          1103     1103              
  Lines         67681    67753      +72     
  Branches       7603     7611       +8     
============================================
+ Hits          37625    37657      +32     
- Misses        27636    27672      +36     
- Partials       2420     2424       +4     

Components	Coverage Δ
spanner-templates	88.47% <81.81%> (-0.02%)	⬇️
spanner-import-export	68.72% <ø> (+0.01%)	⬆️
spanner-live-forward-migration	90.23% <85.71%> (-0.02%)	⬇️
spanner-live-reverse-replication	84.41% <81.81%> (-0.03%)	⬇️
spanner-bulk-migration	92.61% <85.71%> (-0.02%)	⬇️
gcs-spanner-dv	88.89% <85.71%> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
...er/migrations/avro/GenericRecordTypeConvertor.java	96.27% <100.00%> (ø)
...ations/convertors/ChangeEventSpannerConvertor.java	85.24% <ø> (ø)
...igrations/convertors/ChangeEventTypeConvertor.java	88.05% <ø> (ø)
...2/spanner/migrations/spanner/SpannerReadUtils.java	88.15% <ø> (ø)
...om/google/cloud/teleport/v2/spanner/type/Type.java	99.46% <100.00%> (+0.01%)	⬆️
...m/google/cloud/teleport/v2/spanner/ddl/Column.java	90.96% <87.50%> (-0.17%)	⬇️
...eport/v2/templates/transforms/AssignShardIdFn.java	82.95% <0.00%> (-0.27%)	⬇️
.../v2/spanner/migrations/avro/AvroToValueMapper.java	93.53% <66.66%> (-0.72%)	⬇️

... and 4 files with indirect coverage changes

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces first-class support for UUID and PG_UUID data types within the Spanner migration framework. By updating the core type system, mapping logic, and conversion utilities, the changes ensure that UUID fields are correctly identified, mapped, and processed during data migration tasks. These updates improve the robustness of the migration pipeline when dealing with UUID-based schemas.

Highlights

• UUID Type Support: Added comprehensive support for UUID and PG_UUID types across Spanner migration utilities, including type definitions, mapping logic, and DDL handling.
• Migration Utilities Updates: Updated Avro-to-Spanner mappers, change event converters, and Spanner read utilities to correctly handle UUID data types.
• Testing and Validation: Expanded integration tests and schema definitions to validate UUID handling across various migration scenarios, including primary key support and data type conversion.

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[gemini-code-assist]

Code Review

This pull request adds support for the UUID and PG_UUID data types across several Spanner-related templates and common utilities, including schema parsing, Avro mapping, and change event conversion. A critical compilation issue was identified in AssignShardIdFn.java, where value.getUuid() is called on a Spanner Value object. Since the Spanner Java SDK does not have a getUuid() method, this must be updated to use value.getString() instead.

[gemini-code-assist]

The com.google.cloud.spanner.Value class does not have a getUuid() method. In the Cloud Spanner Java SDK, UUID values are retrieved as strings. Calling value.getUuid() will cause a compilation error. Please use value.getString() instead.

Suggested change

	case UUID:
	case PG_UUID:
	return value.getUuid();
	case UUID:
	case PG_UUID:
	return value.getString();

[pratickchokhani]

No. For UUID, we are receiving UUID value instead.