test: add integration test for PostgreSQL partitioned tables

[jsuhani-2026]

Added a new end-to-end integration test (PostgreSQLPartitionedTablesIT) to verify that the SourceDbToSpanner template correctly migrates partitioned tables from a PostgreSQL source into Cloud Spanner.

It validates data ingestion for all three PostgreSQL partitioning strategies across both GoogleSQL and PostgreSQL Spanner dialects:

• RANGE partitioning (measurements_range table)
• LIST partitioning (employees_list table)
• HASH partitioning (orders_hash table)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.49%. Comparing base (1608d1d) to head (90dff43).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4018      +/-   ##
============================================
+ Coverage     55.70%   63.49%   +7.78%     
+ Complexity     7236     2508    -4728     
============================================
  Files          1124      535     -589     
  Lines         68447    30720   -37727     
  Branches       7721     3420    -4301     
============================================
- Hits          38127    19505   -18622     
+ Misses        27846    10202   -17644     
+ Partials       2474     1013    -1461     

Components	Coverage Δ
spanner-templates	88.07% <ø> (+0.41%)	⬆️
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	89.21% <ø> (-0.08%)	⬇️
spanner-live-reverse-replication	83.40% <ø> (-0.07%)	⬇️
spanner-bulk-migration	92.43% <ø> (-0.05%)	⬇️
gcs-spanner-dv	89.98% <ø> (+1.43%)	⬆️
see 613 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 a comprehensive end-to-end integration test suite to ensure the SourceDbToSpanner template correctly handles PostgreSQL partitioned tables. By validating multiple partitioning schemes and both Spanner dialects, the changes improve the reliability of database migrations involving complex table structures.

Highlights

• New Integration Test: Added PostgreSQLPartitionedTablesIT to verify migration of partitioned tables from PostgreSQL to Cloud Spanner.
• Partitioning Strategies: The test covers RANGE, LIST, and HASH partitioning strategies for PostgreSQL source databases.
• Dialect Support: Verified data ingestion compatibility for both GoogleSQL and PostgreSQL Spanner dialects.

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[gemini-code-assist]

Code Review

This pull request introduces a new integration test, PostgreSQLPartitionedTablesIT, along with corresponding SQL schemas to verify the migration of PostgreSQL partitioned tables (range, list, and hash partitions) to both GoogleSQL and PostgreSQL dialect Spanner databases. The code review feedback identifies two key issues: first, the static declaration of the jobInfo field should be replaced with local variables within each test method to prevent potential race conditions; second, the third parameter of launchDataflowJob is incorrectly supplied with a comma-separated list of tables instead of a proper GCS path prefix.

[sm745052]

LGTM