0.12.0

Issues

• [jdbc-v2] LightParser Implementation

  area:sql-parserenhancementjdbc-v2
  ClickHouse/clickhouse-java#2797 · Filter by author chernser opened on Mar 18, 2026 · 0.12.0

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

  area:client-pojo-serdeclient-api-v2jdbc-v2
  ClickHouse/clickhouse-java#2828 · Filter by author chernser opened on Apr 15, 2026 · 0.12.0

• Add option to register custom class serializers

  client-api-v2enhancement
  ClickHouse/clickhouse-java#2291 · Filter by author mikeyg123 opened on Apr 8, 2025 · 0.12.0
  1

• How to use ClientV2 and ExternalTable

  client-api-v2questionv2-feedback
  ClickHouse/clickhouse-java#2397 · Filter by author den-crane opened on May 29, 2025 · 0.12.0
  2

  

• DataTypeConverter usage has potential thread-safety issues

  bugclient-api-v2
  ClickHouse/clickhouse-java#2728 · Filter by author janeklb opened on Jan 29, 2026 · 0.12.0
  1

• V2 driver ignores column timezones when reading via getTimestamp

  bugquestion
  ClickHouse/clickhouse-java#2787 · Filter by author kostya-sh opened on Mar 12, 2026 · 0.12.0
  25

  

• [jdbc-v2] DatabaseMetadata fails if server has a new type

  area:jdbc-metadatabugjdbc-v2
  ClickHouse/clickhouse-java#2394 · Filter by author chernser opened on May 28, 2025 · 0.12.0
  4

• Clickhouse Closed unexpectedly. Code: 33. DB::Exception: Cannot read all data.

  area:networkclient-api-v2
  ClickHouse/clickhouse-java#2479 · Filter by author Narthexes opened on Jun 30, 2025 · 0.12.0
  2

• UnknownException: (org.apache.spark.SparkSQLException) [UNRECOGNIZED_SQL_TYPE] Unrecognized SQL type - name: UInt64, id: OTHER. SQLSTATE: 42704

  bug
  ClickHouse/clickhouse-java#2466 · Filter by author MindaugasDatanome opened on Jun 23, 2025 · 0.12.0
  3

• InputStream reset() can fail on retries for BufferedInputStreams

  area:docs
  ClickHouse/clickhouse-java#2675 · Filter by author JD557 opened on Dec 2, 2025 · 0.12.0
  1

• clickhouse-http-client: how do I close the connection in case of an error?

  area:networkbugtriagedusability
  ClickHouse/clickhouse-java#1712 · Filter by author Valeronik opened on Jun 30, 2024 · 0.12.0
  3

• [client-v2] Abstract a Transport Layer

  client-api-v2enhancement
  ClickHouse/clickhouse-java#2173 · Filter by author chernser opened on Feb 25, 2025 · 0.12.0
  1

• [client-v2] Async HTTP Client support

  client-api-v2
  ClickHouse/clickhouse-java#1831 · Filter by author chernser opened on Sep 25, 2024 · 0.12.0
  4

• [client-v2] Implement a framework for schema validation

  area:generalarea:jdbc-metadataclient-api-v2
  ClickHouse/clickhouse-java#2672 · Filter by author chernser opened on Dec 1, 2025 · 0.12.0

• Batch insert failed

  area:jdbc-insertjdbc-v2question
  ClickHouse/clickhouse-java#2370 · Filter by author ducklikeeat opened on May 16, 2025 · 0.12.0
  3

• ClickHouseDatabaseMetaData.getCatalogs exceeds max_execution_time, causing the connection not to be released

  action:verifybugclient-api-v2
  ClickHouse/clickhouse-java#1557 · Filter by author akenO8 opened on Mar 5, 2024 · 0.12.0

• BatchUpdateException during inserts with jdbc driver

  bugclient-api-v2investigating
  ClickHouse/clickhouse-java#1444 · Filter by author stasDomb opened on Sep 7, 2023 · 0.12.0
  24

• addBatch method cause Java heap memory char array grows too fast

  jdbc-v1jdbc-v2question
  ClickHouse/clickhouse-java#1873 · Filter by author wangbing505 opened on Oct 18, 2024 · 0.12.0
  9

• Duplicate Classes while importing clickhouse-jdbc

  area:packagingbug
  ClickHouse/clickhouse-java#2474 · Filter by author akhalifeh79 opened on Jun 26, 2025 · 0.12.0
  1

• beta.row_binary_for_simple_insert fails on Uint64 values larger than long type passed as string

  area:jdbc-insertbugjdbc-v2
  ClickHouse/clickhouse-java#2619 · Filter by author troyjcurt opened on Oct 21, 2025 · 0.12.0
  3

• Potential performance issue with SQL parsing in jdbc-v2

  jdbc-v2performancev2-feedback
  ClickHouse/clickhouse-java#2585 · Filter by author jploski opened on Sep 12, 2025 · 0.12.0
  1

• ClickHouse java client - reusing same instance of ClickHouseClient gives execution timeout after 10 inserts

  area:networkclient-api-v2enhancement
  ClickHouse/clickhouse-java#1668 · Filter by author occunha opened on Jun 3, 2024 · 0.12.0
  9

• Socket closed

  area:networkclient-api-v2investigating
  ClickHouse/clickhouse-java#1787 · Filter by author thiagohora opened on Aug 24, 2024 · 0.12.0
  13

• How to insert Array(String) using clickhouse-http-client 4.6 (RowBinary) ?

  area:data-typearea:docscode-examplejdbc-v2module-client
  ClickHouse/clickhouse-java#1425 · Filter by author den-crane opened on Aug 23, 2023 · 0.12.0
  2

• Table with transaction column name not parsed

  bugjdbc-v1jdbc-v2usability
  ClickHouse/clickhouse-java#1477 · Filter by author subkanthi opened on Oct 23, 2023 · 0.12.0
  7