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Lei, HUANGandCopilot Autofix powered by AI be482553b0 fix(mito2): harden flat merge and use winner_tree (#9064 )

* fix(mito2): reject non-flat batches in flat merge instead of panicking

- SortColumns::new becomes fallible try_new: batches missing the
  flat-format internal columns (time index, __primary_key, __sequence)
  at the fixed trailing positions now yield InvalidRecordBatch instead
  of a downcast panic, completing the generic-schema gate that only
  covered BatchBuilder output assembly. Document the flat-format input
  contract on FlatMergeIterator/FlatMergeReader.
- Clarify why BatchBuilder's schema gate uses >= 3 columns when a real
  flat-format schema always has at least 4.
- Add schema-structure tests: empty primary keys (tables without tags),
  dictionary-encoded string tag columns with per-source dictionaries,
  and graceful rejection of batches without internal columns.

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

* test(mito2): scan tables with various schemas through flat merge

Add an engine-level test that writes, flushes and scans regions without
tags (empty primary key) and with multiple string tags (dictionary-encoded
in the flat input schema), so the flat merge reader merges an SST with
the memtable on real schemas instead of hand-built batches.

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>

* refactor(mito2): use winner_tree dependency

Signed-off-by: Lei, HUANG <ratuthomm@gmail.com>

* Update comments for FlatMergeIterator struct

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Signed-off-by: Lei, HUANG <mrsatangel@gmail.com>
Signed-off-by: Lei, HUANG <ratuthomm@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

2026-09-08 07:20:18 +00:00

benches

perf(mito2): blazing-fast tournament tree merger (#8989 )

2026-09-07 06:34:43 +00:00

src

fix(mito2): harden flat merge and use winner_tree (#9064 )

2026-09-08 07:20:18 +00:00

test-data

refactor: json2 v2 storage layout (#8979 )

2026-09-01 13:39:56 +00:00

AGENTS.md

feat(mito2): add series index searcher (#8926 )