[Feature] Support changelog for primary-key tables #219

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• I searched in the issues and found nothing similar.

Motivation

Background

Paimon primary-key tables support multiple changelog production modes in Java Paimon:

• none
• input
• lookup
• full-compaction

Paimon C++ currently has only tiny changelog support. This issue tracks the end-to-end implementation and compatibility work required to align Paimon C++ changelog behavior with Java Paimon.

Goals

Support the complete changelog lifecycle for primary-key tables:

input records
    ↓
write buffer / compaction
    ↓
changelog data files
    ↓
snapshot and manifest metadata
    ↓
streaming scan
    ↓
INSERT / DELETE / UPDATE_BEFORE / UPDATE_AFTER

Are you willing to submit a PR?

• I'm willing to submit a PR!