lszskye opened a new pull request, #473:
URL: https://github.com/apache/paimon-cpp/pull/473
### Purpose
Linked issue: #382
Global index checkpoints currently use the table's index directory even
when `global-index.external-path` is configured.
This change makes checkpoint writes, recovery, and cleanup use
`<global-index.external-path>/checkpoint/<task_id>` when configured.
Without an external path, checkpoints remain under
`<table_path>/index/checkpoint/<task_id>`.
Task cleanup resolves the external path from table schema options and
caller overrides, preserving other tasks' checkpoints and completed
index files.
### Tests
src/paimon/core/global_index/global_index_file_manager_test.cpp
src/paimon/core/utils/file_store_path_factory_test.cpp
test/inte/global_index_test.cpp
### Documentation
- Document checkpoint locations, cleanup configuration, and task ID
uniqueness across tables sharing an external index directory.
- Clarify filesystem error propagation in the cleanup API.
- Move full-text predicate and root TopK usage documentation from the API
reference into the user guide.
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