Issues

• Iceberg: INSERT into a table partitioned by bucket(...) panics with "entered unreachable code"

  databendlabs/databend#20742 · Filter by author djouallah opened on Oct 17, 2026

• Iceberg: time travel AT (SNAPSHOT => ...) reads the current snapshot

  databendlabs/databend#20741 · Filter by author djouallah opened on Oct 17, 2026

• Iceberg: ALTER TABLE ADD COLUMN / DROP COLUMN return success and change nothing

  databendlabs/databend#20740 · Filter by author djouallah opened on Oct 17, 2026

• Iceberg: INSERT OVERWRITE appends instead of replacing the table's rows

  databendlabs/databend#20739 · Filter by author djouallah opened on Oct 17, 2026

• Iceberg: TRUNCATE TABLE returns success and leaves every row

  databendlabs/databend#20738 · Filter by author djouallah opened on Oct 17, 2026

• Iceberg: CREATE TABLE with a struct, array or map column fails: "Field id not found in metadata"

  databendlabs/databend#20737 · Filter by author djouallah opened on Oct 17, 2026

• Iceberg: CREATE TABLE with a DECIMAL column fails: "Unsupported Arrow data type: Decimal64(10, 2)"

  databendlabs/databend#20736 · Filter by author djouallah opened on Oct 17, 2026

• Iceberg: CREATE TABLE ... AS SELECT panics with "table_id_seq must have been set. CTAS(replace)"

  databendlabs/databend#20735 · Filter by author djouallah opened on Oct 17, 2026

• TPC-H Q4 at SF=100 on Iceberg: semi join builds on the 379M-row side and hits MemoryExceedsLimit instead of spilling

  databendlabs/databend#20733 · Filter by author djouallah opened on Oct 17, 2026

• UNION ALL over parquet sources with different schemas fails with TableSchemaMismatch (also on Iceberg tables)

  databendlabs/databend#20732 · Filter by author djouallah opened on Oct 17, 2026

• Feature: Add trailing comma support in SELECT projection list for Snowflake parity

  C-feature
  databendlabs/databend#20731 · Filter by author themalse opened on Oct 17, 2026
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• test: fault_injection rules are process-global and fail unrelated tests in the same binary

  C-bug
  databendlabs/databend#20730 · Filter by author dantengsky opened on Oct 17, 2026
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• Flaky test: http_query_handlers::test_wait_time_secs asserts racy Starting state

  databendlabs/databend#20728 · Filter by author dantengsky opened on Oct 16, 2026
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• Performance: time_slice rebuilds its constant slice spec for every row

  databendlabs/databend#20726 · Filter by author vbmithr opened on Oct 16, 2026
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• sqllogictests: runner panics on a comment line where byte 18 falls inside a multi-byte char

  databendlabs/databend#20725 · Filter by author dantengsky opened on Oct 16, 2026
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• bug: Multi-table reconstructed query (correlated scalar subquery + EXISTS + derived table) crashes the query service

  C-bug
  databendlabs/databend#20717 · Filter by author Annie191 opened on Oct 16, 2026
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• Feature: multiway-merge recluster is slower than the previous path

  databendlabs/databend#20715 · Filter by author vbmithr opened on Oct 15, 2026
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• bug: queries hang instead of failing after a memory-limit allocation panic

  databendlabs/databend#20714 · Filter by author vbmithr opened on Oct 15, 2026
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• bug: EXPLAIN reports partitions total in segments but partitions scanned in blocks

  databendlabs/databend#20713 · Filter by author vbmithr opened on Oct 15, 2026
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• Feature: answer filtered count(*) from metadata for blocks the filter wholly matches

  databendlabs/databend#20712 · Filter by author vbmithr opened on Oct 15, 2026
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• Feature: keep a sorted COPY input non-overlapping in a clustered table without a recluster

  databendlabs/databend#20711 · Filter by author vbmithr opened on Oct 15, 2026
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• Feature: avoid the ingest cost of default bloom indexes on every column

  databendlabs/databend#20710 · Filter by author vbmithr opened on Oct 15, 2026
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• bug: ORDER BY position is rejected after UNION / set operations

  databendlabs/databend#20709 · Filter by author vbmithr opened on Oct 15, 2026
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• bug(query): qualified table names are resolved to same-named CTEs

  C-bug
  databendlabs/databend#20686 · Filter by author TCeason opened on Oct 14, 2026
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• VACUUM ALL: avoid full LIST scans on tables with no new garbage

  databendlabs/databend#20685 · Filter by author dantengsky opened on Oct 14, 2026
  1