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executeBatch()` on a prepared INSERT runs s are ~1–2 orders of magnitude slower than the Appender

Status: Open.

#815 In duckdb/duckdb-java;

· stbischof opened on Aug 15, 2026

Overhead in VARCHAR writes in Java table functions

Status: Open.

#812 In duckdb/duckdb-java;

· lfkpoa opened on Aug 14, 2026

Support virtual columns in Java table functions, including empty projection for COUNT(*)

capi_v2Related to C API v2Related to C API v2

Status: Open.

#806 In duckdb/duckdb-java;

· lfkpoa opened on Aug 13, 2026

Optimizer incorrectly rewrites window plans involving arrow scan inputs to self-joins with multiple refs to the scan

Status: Open.

#713 In duckdb/duckdb-java;

· randalloveson opened on Jun 16, 2026

Failure to auto load httpfs extension after upgrading to 1.5.*

Status: Open.

#679 In duckdb/duckdb-java;

· filipe-amberflo-io opened on May 5, 2026

[Appender] Add support for VARIANT

Status: Open.

#643 In duckdb/duckdb-java;

· rayokota opened on Apr 11, 2026

DBeaver does not show indexes

Status: Open.

#640 In duckdb/duckdb-java;

· nRoger-Env opened on Apr 9, 2026

CALL start_ui_server() triggers extension download in DuckDB 1.5.0

Status: Open.

#623 In duckdb/duckdb-java;

· sanjukeshavan opened on Mar 26, 2026

Running driver on not officially supported platforms

Status: Open.

#605 In duckdb/duckdb-java;

· DNikolaevAtRocket opened on Mar 17, 2026

Loading extensions conflicts with JVM in debug mode

Status: Open.

#593 In duckdb/duckdb-java;

· juja0 opened on Mar 6, 2026

Interval fields returned as String

Status: Open.

#580 In duckdb/duckdb-java;

· raszi opened on Feb 26, 2026

TIMESTAMP_NS nanoseconds are truncated

Status: Open.

#571 In duckdb/duckdb-java;

· kostya-sh opened on Feb 20, 2026