List view

Slow deserialization of DateTime values

area:data-typedata type processing issuesdata type processing issues

performance

test

Status: Open.

#715 In ClickHouse/clickhouse-java;

· zhicwu opened on Sep 7, 2021

Regression on format JSONEachRow with JDBC v2

bug

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2799 In ClickHouse/clickhouse-java;

· Olivier-Petri opened on Mar 18, 2026

[client-v2] Nullable in nested incorrectly handled

area:data-typedata type processing issuesdata type processing issues

bug

client-api-v2

Status: Open.

Bug

#2721 In ClickHouse/clickhouse-java;

· chernser opened on Jan 21, 2026

[jdbc-v2, client-v2] Accept 1 and 0 for boolean properties

area:generalgeneral issue without a specific area.general issue without a specific area.

client-api-v2

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

Bug

#2730 In ClickHouse/clickhouse-java;

· chernser opened on Jan 29, 2026

[client-v2, jdbc-v2] Fix handling strings with special characters

area:data-typedata type processing issuesdata type processing issues

bug

client-api-v2

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2781 In ClickHouse/clickhouse-java;

· chernser opened on Mar 9, 2026

Passing a List<String> as a query parameter in client-v2 requires to single quote every element

area:data-typedata type processing issuesdata type processing issues

bug

client-api-v2

Status: Open.

#2407 In ClickHouse/clickhouse-java;

· jnd77 opened on Jun 3, 2025

[client-v2] Implement Streaming API for Binary formats

area:formathandling specific formathandling specific format

client-api-v2

Status: Open.

#2665 In ClickHouse/clickhouse-java;

· chernser opened on Nov 24, 2025

When serialize FixedString and string is bigger than size defined in Table definition

area:data-typedata type processing issuesdata type processing issues

client-api-v2

v2-feedback

Status: Open.

#2223 In ClickHouse/clickhouse-java;

· mzitnik opened on Mar 14, 2025

JDBC does not recognize CH errors in the middle of a result

area:networknetwork and IO related issuesnetwork and IO related issues

blocked-by-clickhouse

bug

jdbc-v1JDBC driverJDBC driver

Status: Open.

#650 In ClickHouse/clickhouse-java;

· den-crane opened on May 5, 2021

Complete implementeing SET ROLE feature

enhancement

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2759 In ClickHouse/clickhouse-java;

· mzitnik opened on Feb 25, 2026

totals don't work with new Clickhouse server versions

action:verify

enhancement

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#1387 In ClickHouse/clickhouse-java;

· den-crane opened on Jun 28, 2023

[client-v2] Handle new error tag from ClickHouse

area:generalgeneral issue without a specific area.general issue without a specific area.

Status: Open.

#2702 In ClickHouse/clickhouse-java;

· chernser opened on Dec 22, 2025

If received NetException from ClickHouse in response body, it will be ignored and unrecognized

area:error-handling

bug

client-api-v2

Status: Open.

#2287 In ClickHouse/clickhouse-java;

· DNAlchemist opened on Apr 7, 2025

Request cancelation

bug

client-api-v2

module-httpHTTP/HTTPS clientHTTP/HTTPS client

Status: Open.

#1760 In ClickHouse/clickhouse-java;

· chernser opened on Aug 2, 2024

[client-v2, jdbc-v2] Server bound query parameters

client-api-v2

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

Feature

#2827 In ClickHouse/clickhouse-java;

· chernser opened on Apr 15, 2026

Unsupported data type: Nested

area:client-inserthandling data insert in clienthandling data insert in client

area:data-typedata type processing issuesdata type processing issues

bug

client-api-v2

Status: Open.

#2477 In ClickHouse/clickhouse-java;

· Marina-Kr opened on Jun 30, 2025

Query parameters can not be parsed in DESCRIBE TABLE query with client-v2

area:generalgeneral issue without a specific area.general issue without a specific area.

bug

client-api-v2

Status: Open.

#2400 In ClickHouse/clickhouse-java;

· jnd77 opened on Jun 2, 2025

[Jdbc, Client] Error handling

bug

client-api-v2

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2774 In ClickHouse/clickhouse-java;

· chernser opened on Mar 4, 2026

Major performance regression in client-v2

client-api-v2

performance

v2-feedback

Status: Open.

#2516 In ClickHouse/clickhouse-java;

· alekkol opened on Jul 31, 2025

[jdbc-v2] review default value for wait_end_of_query

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2830 In ClickHouse/clickhouse-java;

· chernser opened on Apr 16, 2026