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

[client-v2] Add support of working with large strings

client-api-v2

enhancement

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2263 In ClickHouse/clickhouse-java;

· Paultagoras opened on Apr 1, 2025

[client-v2] Support self-signed certificates

client-api-v2

enhancement

Status: Open.

#2309 In ClickHouse/clickhouse-java;

· chernser opened on Apr 15, 2025

[client-v2] Client does not honor sslMode=none

area:networknetwork and IO related issuesnetwork and IO related issues

bug

client-api-v2

Status: Open.

#2389 In ClickHouse/clickhouse-java;

· dpsutton opened on May 26, 2025

Java client-v2 server settings does not work for wait_for_async_insert

bug

client-api-v2

investigatingInvestigation of a root cause is on goingInvestigation of a root cause is on going

question

Status: Open.

#2510 In ClickHouse/clickhouse-java;

· aadhikary opened on Jul 29, 2025

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

getBlob implementation

area:jdbc-readreading data with jdbcreading data with jdbc

enhancement

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2558 In ClickHouse/clickhouse-java;

· AndrewRazumovskiy opened on Sep 2, 2025

[V2] Support USE_BINARY_STRING in ClickHouse V2 client

client-api-v2

v2-feedback

Status: Open.

#2608 In ClickHouse/clickhouse-java;

· krvikash opened on Oct 6, 2025

[Client, JDBC] Migration Guide

area:docsDocumentation missingDocumentation missing

enhancement

Status: Open.

Feature

#2640 In ClickHouse/clickhouse-java;

· chernser opened on Nov 4, 2025

[client,jdbc] Support data type MacAddress

enhancement

Status: Open.

#2643 In ClickHouse/clickhouse-java;

· chernser opened on Nov 4, 2025

Cancel statement doesn’t work due to “Session is locked by a concurrent client” (Regression for v2 client, v0.9.4)

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

bug

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2690 In ClickHouse/clickhouse-java;

· Keith-McCready opened on Dec 11, 2025

[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

[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

[jdbc-v2] Document Type Info changes in V2 in documentation

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

Task

#2743 In ClickHouse/clickhouse-java;

· chernser opened on Feb 12, 2026

ClickHouseBinaryFormatReader::getBigDecimal silently truncates large integer values

area:data-typedata type processing issuesdata type processing issues

bug

client-api-v2

Status: Open.

#2748 In ClickHouse/clickhouse-java;

· AndreasP-EP opened on Feb 18, 2026

[jdbc-v2] Reading JSON as String

Status: Open.

#2760 In ClickHouse/clickhouse-java;

· chernser opened on Feb 26, 2026

[client-v2] Include more details about HTTP errors

area:networknetwork and IO related issuesnetwork and IO related issues

client-api-v2

Status: Open.

#2764 In ClickHouse/clickhouse-java;

· chernser opened on Feb 27, 2026

[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

Allow configuring HTTP redirect strategy for Apache HTTP Client

client-api-v2

enhancement

Status: Open.

#2776 In ClickHouse/clickhouse-java;

· ShilovI opened on Mar 4, 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

Time64 values cannot be read as LocalTime

bug

Status: Open.

#2763 In ClickHouse/clickhouse-java;

· anesterenok opened on Feb 27, 2026

NULL Dynamic column with defaults protocol causes byte stream misalignment

Status: Open.

#2791 In ClickHouse/clickhouse-java;

· alex-clickhouse opened on Mar 17, 2026

Variant column reading crashes on NULL values (0xFF discriminator not handled)

area:data-typedata type processing issuesdata type processing issues

bug

client-api-v2

Status: Open.

#2789 In ClickHouse/clickhouse-java;

· alex-clickhouse opened on Mar 13, 2026

Unexpected Update-Like Behavior with SELECT DISTINCT ON Using * or with aliases (clickhouse-jdbc v0.9.6)

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

bug

jdbc-v2jdbc-v2 issuesjdbc-v2 issues

Status: Open.

#2773 In ClickHouse/clickhouse-java;

· k3nj1g opened on Mar 3, 2026