Separate GreenPlum connection logic from PostgreSQL package#27

Draft

Copilot wants to merge 9 commits into

copilot/refactor-pg-connection-again

Commits on Feb 5, 2026

Initial plan
Copilot
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Refactor PG connection from GP stuff - separate GP-specific connection logic

Copilot
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chipitsine
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Address code review comments - fix comment and remove unused function

Copilot
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chipitsine
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Improve comments to clarify connection logic and parameter behavior

Copilot
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chipitsine
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Fix build errors by removing unused postgres imports from greenplum files

Copilot
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chipitsine
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Fix GreenPlum segment backup connection by adding custom connect function support

Copilot
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chipitsine
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Add missing pgx import to fix build errors

Copilot
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chipitsine
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Fix segment backup initialization by passing connect function to NewBackupHandler

Copilot
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chipitsine
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Fix linting errors: gofmt and line length issues

Copilot
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chipitsine
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