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DateTime('Fixed/UTC±HH:MM:SS') timezone silently dropped — wall-clock shifted to UTC

Status: Open.

#2876 In ClickHouse/clickhouse-java;

· claude opened on Jun 15, 2026

[r2dbc] getRowsUpdated() returns 0 for successful INSERT...SELECT — needs reliable written_rows

Status: Open.

#2860 In ClickHouse/clickhouse-java;

· thiagohora opened on May 26, 2026

·

0.11.0

[client-v2] Default sends query parameters in URI, causing HTTP 414 for large IN-lists / vector embeddings

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

client-api-v2

Status: Open.

#2856 In ClickHouse/clickhouse-java;

· claude opened on May 15, 2026

[client-v2] getNextAliveNode() always returns endpoints.get(0) — retries never fail over to alternate endpoints

area:networknetwork and IO related issues network and IO related issues

client-api-v2

Status: Open.

#2855 In ClickHouse/clickhouse-java;

· claude opened on May 15, 2026

[clickhouse-http-client v1] HTTP transport ignores X-ClickHouse-Exception-Code on HTTP 200 (HttpURLConnection, Java11 HttpClient)

area:networknetwork and IO related issues network and IO related issues

client-v1issues applicable only for an old client issues applicable only for an old client

module-httpHTTP/HTTPS client HTTP/HTTPS client

Status: Open.

#2854 In ClickHouse/clickhouse-java;

· claude opened on May 15, 2026

BinaryStreamReader.ArrayValue wrong return type

area:data-typedata type processing issues data type processing issues

bug

client-api-v2

Status: Open.

#2846 In ClickHouse/clickhouse-java;

· hakim-dc opened on Apr 29, 2026

·

0.11.0

Thread safety of client-v2 Client

area:docsDocumentation missing Documentation missing

client-api-v2

enhancement

jdbc-v2jdbc-v2 issues jdbc-v2 issues

Status: Open.

#2845 In ClickHouse/clickhouse-java;

· sanzh-m opened on Apr 28, 2026

It prompts a **lexical error**, yet the execution succeeds.

area:sql-parser

jdbc-v2jdbc-v2 issues jdbc-v2 issues

Status: Open.

#2839 In ClickHouse/clickhouse-java;

· hellozhzhhao opened on Apr 22, 2026

JDBC Driver: PreparedStatement counts ? placeholders inside SQL comments (regression since 0.1.36)

Status: Open.

#2835 In ClickHouse/clickhouse-java;

· enaviduka-bit opened on Apr 21, 2026

[client-v2] Guava library

area:packaging

Status: Open.

Task

#2831 In ClickHouse/clickhouse-java;

· chernser opened on Apr 17, 2026

[jdbc-v2] review default value for wait_end_of_query

jdbc-v2jdbc-v2 issues jdbc-v2 issues

Status: Open.

#2830 In ClickHouse/clickhouse-java;

· chernser opened on Apr 16, 2026

·

0.11.0

[client-v2, jdbc-v2] POJO Serialization Issues

area:client-pojo-serdeSerDe of POJO's SerDe of POJO's

client-api-v2

jdbc-v2jdbc-v2 issues jdbc-v2 issues

Status: Open.

#2828 In ClickHouse/clickhouse-java;

· chernser opened on Apr 15, 2026

·

0.12.0