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Daniel RammerandClaude Opus 5
dd197ad0ff
`LsmWriteSpec::maintained_indexes` becomes `Option<Vec<String>>`. `None` — now the default for a freshly constructed spec — maintains every index the MemWAL supports, resolved when the spec is installed. `Some([])` maintains none, and an explicit list is still taken verbatim. Resolution filters on `IndexConfig::is_memwal_maintainable`, which delegates to lance's `is_maintainable_index_type`. Sweeping up an index the memtable cannot build (a bitmap, say) would fail every memtable claim and leave the table unwritable, so the inferred set excludes them and an explicit list naming one is now rejected up front rather than at claim time. The resolved set is a snapshot, not a subscription: an index created after the spec is installed is not maintained until the spec is unset and set again. That is why the default flipped from "maintain nothing" — an unwanted maintained index costs memory, while a silently unmaintained one degrades FTS to an unscored scan. Note this needs a lance release carrying `is_maintainable_index_type` before it builds against the pinned tag. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>