Issues

Databend Roadmap for 2025
#14167 · bohutang opened on Dec 27, 2023
22
Databend vs. Snowflake Features and Capabilities
#13059 · bohutang opened on Sep 27, 2023
14

bug: ARRAY_AGG in multi-table JOIN query incorrectly aggregates NULL array as empty array, causing inconsistent results
databendlabs/databend#20603 · opened on Oct 1, 2026
bug: Multi-table LEFT JOIN split query returns fewer rows than single-table query due to interaction between rank limit and runtime filter
databendlabs/databend#20601 · opened on Sep 30, 2026
Iceberg: decimal stored as FIXED_LEN_BYTE_ARRAY fails with "Parquet argument error: EOF: Not enough bytes to decode"
databendlabs/databend#20588 · opened on Sep 29, 2026
Feature: avoid data rewrite for safe ALTER TABLE MODIFY COLUMN type widening
databendlabs/databend#20576 · opened on Sep 24, 2026
bug: Inconsistent query results: multi-table reconstructed query produces duplicate rows due to WHERE predicate pushdown causing RIGHT JOIN anti-join to emit extra rows
databendlabs/databend#20568 · opened on Sep 23, 2026
perf: distributed query fragment preparation is sequential and can exceed the leak cleanup timeout
databendlabs/databend#20563 · opened on Sep 23, 2026
1
bug: CTAS CREATE OR REPLACE leaves old table with NULL dropped_on in tables_with_history
databendlabs/databend#20562 · opened on Sep 23, 2026
1
Tracking: optimize window function execution
databendlabs/databend#20521 · opened on Sep 18, 2026
2
bug: any spilling hash join fails with Internal 1001 "The level N hybrid hash state has been destroyed" once max_hash_join_spill_level >= 2
databendlabs/databend#20512 · opened on Sep 16, 2026
bug: NOT IN / <> ALL with a NULL in the subquery returns rows once the mark join spills
databendlabs/databend#20511 · opened on Sep 16, 2026
bug: cloned scans lose predicate pushdown during decorrelation
databendlabs/databend#20509 · opened on Sep 16, 2026
2
bug: ALTER TASK MODIFY AS fails inside a multi-statement task body
databendlabs/databend#20502 · opened on Sep 15, 2026
InferFilterOptimizer panics with TypedConstantExpr due to ScalarExpr Eq/Hash mismatch
databendlabs/databend#20494 · opened on Sep 14, 2026
bug: UnwindError: assertion failed: partition.total > 0 when ORDER BY sorting a BIGINT % FLOAT expression
databendlabs/databend#20484 · opened on Sep 13, 2026
bug: Databend query service crashes with IN subquery + correlated scalar subquery + derived table + outer range-correlated MIN
databendlabs/databend#20477 · opened on Sep 11, 2026
1
bug: mixed Decimal scales in virtual columns change Variant string predicates
databendlabs/databend#20458 · opened on Sep 8, 2026
bug: virtual column pruning ignores defaults for newly added Variant sources
databendlabs/databend#20457 · opened on Sep 8, 2026
perf: reduce data skew in MERGE INTO
databendlabs/databend#20399 · opened on Aug 27, 2026
feat: Support REFRESH BLOOM INDEX
databendlabs/databend#20398 · opened on Aug 27, 2026
refactor: remove FLASHBACK once Table Branch is stable.
databendlabs/databend#20386 · opened on Aug 26, 2026
chore: follow-ups for atomic change-tracking enablement (#20272)
databendlabs/databend#20286 · opened on Aug 11, 2026
improvement: tighten truncated string max statistics bounds
databendlabs/databend#20200 · opened on Jul 24, 2026
fix: align string statistics may_be_truncated with character-based trimming
databendlabs/databend#20197 · opened on Jul 24, 2026
query: account for cursor-held buffers after Top-N compaction
databendlabs/databend#20188 · opened on Jul 22, 2026
Feature: Native Apache Paimon integration and Rust ecosystem collaboration
databendlabs/databend#20162 · opened on Jul 16, 2026