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CTE materialisation prevents column pruning for simple pass-through CTEs (100x slowdown, regression between 1.3.2 and 1.4.0)

reproduced

Status: Open.

#20958 In duckdb/duckdb;

· RobinL opened on Feb 14, 2026

Shasum on extension file changed for fixed link/version

under review

Status: Open.

#20956 In duckdb/duckdb;

· FrankPortman opened on Feb 13, 2026

duckdb 1.5: Wrong result using two struct columns

reproduced

Status: Open.

#20955 In duckdb/duckdb;

· gishor opened on Feb 13, 2026

Insert or replace succeeds but doesn't update non-PK indexed columns

reproduced

Status: Open.

#20952 In duckdb/duckdb;

· jkeillor opened on Feb 13, 2026

duckdb 1.5: INTERNAL error with window function

reproduced

Status: Open.

#20941 In duckdb/duckdb;

· gishor opened on Feb 13, 2026

C API feature request: Register in-memory Arrow data as DuckDB table (zero-copy)

under review

Status: Open.

#20937 In duckdb/duckdb;

· ripplehang opened on Feb 13, 2026

duckdb 1.5: Segmentation fault with window query

reproduced

Status: Open.

#20928 In duckdb/duckdb;

· gishor opened on Feb 12, 2026

Unusually Large Error with APPROX_COUNT_DISTINCT

reproduced

Status: Open.

#20916 In duckdb/duckdb;

· johangithub opened on Feb 11, 2026

DuckDB fails on parquet with invalid UTF8 error that passed clickhouse and starrocks fine

under review

Status: Open.

#20906 In duckdb/duckdb;

· apatrida opened on Feb 11, 2026

DuckDB doesn't preserve UTC offset when adding a day to timestamptz column

expected behaviorThe behavior described in the issue is expectedThe behavior described in the issue is expected

Needs DocumentationUse for issues or PRs that require changes in the documentationUse for issues or PRs that require changes in the documentation

Status: Open.

#20845 In duckdb/duckdb;

· MarcoGorelli opened on Feb 6, 2026

Inconsistent Column Resolution Between Derived Tables and CTEs When Using JOIN ... USING Clause

reproduced

Status: Open.

#20844 In duckdb/duckdb;

· david-mateo opened on Feb 6, 2026

Performance Regression Recursive CTE

reproduced

Status: Open.

#20838 In duckdb/duckdb;

· kryonix opened on Feb 6, 2026