airborne12 opened a new pull request, #59793:
URL: https://github.com/apache/doris/pull/59793
## Summary
- Enable `skip_write_index_on_load` property for ANN indexes to skip index
construction during data loading and defer it to compaction time
- When enabled, ANN index is not built during INSERT operations, improving
data loading performance
- Query falls back to brute force search when ANN index is not available
- ANN index is built during compaction and becomes available for approximate
search
## Changes
- **FE**: Remove restriction that blocked `skip_write_index_on_load=true`
- **BE**: Only skip ANN index during TYPE_DIRECT writes, not inverted index
- **BE**: Handle graceful fallback to brute force when ANN index is missing
- **BE**: Return `INVERTED_INDEX_BYPASS` when ANN index file is empty
## Test plan
- [x] Regression test `test_skip_write_index_on_load.groovy` verifies:
- Case 1: `skip_write_index_on_load=true` + insert → no ann.faiss in index
file
- Case 2: `skip_write_index_on_load=true` + compaction → ann.faiss exists
- Case 3: `skip_write_index_on_load=false` + insert → ann.faiss exists
immediately
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