Issues

• [client-v2] OP_SERIALIZATION metric reports the whole operation duration, not the serialization step

  bugclient-api-v2
  ClickHouse/clickhouse-java#3198 · Filter by author polyglotAI-bot opened on Oct 9, 2026

• [client-v2] Native format: a LowCardinality column is read as plain values, desynchronizes the stream ("Non-empty typeName is required")

  bugclient-api-v2
  ClickHouse/clickhouse-java#3193 · Filter by author polyglotAI-bot opened on Oct 7, 2026

• [client-v2] Reading Array(IPv6) / Array(Nullable(IPv6)) fails when an element is an IPv4-mapped address (::ffff:a.b.c.d)

  area:client-readarea:data-typearea:jdbc-readbugclient-api-v2jdbc-v2
  ClickHouse/clickhouse-java#3192 · Filter by author polyglotAI-bot opened on Oct 7, 2026

• Nested arrays report wrong types in 0.11.0

  bug
  ClickHouse/clickhouse-java#3190 · Filter by author michael-simons opened on Oct 7, 2026

• JDBC metadata reports java.lang.Object for IPv4 and IPv6 column class names

  area:jdbc-metadatabugjdbc-v2
  ClickHouse/clickhouse-java#3189 · Filter by author ventod opened on Oct 7, 2026 · 0.12.0
  1

  

• client-v2: a self-referential collection in a Dynamic column hangs (array/List) or throws StackOverflowError (Map) instead of a clean exception

  ClickHouse/clickhouse-java#3177 · Filter by author claude opened on Oct 1, 2026

• [client-v2] Out-of-range numeric values are silently wrapped when inserted into Int32/Int64/UInt64 columns (Int8/Int16 correctly throw)

  ClickHouse/clickhouse-java#3176 · Filter by author claude opened on Oct 1, 2026
  3

• [client-v2] ZSTD is the default but the zstd-jni "cloud" classifier ships no Windows or Intel-macOS natives, so every query fails there

  ClickHouse/clickhouse-java#3175 · Filter by author piyush15102003 opened on Oct 1, 2026

• client-v2 retries an insert with the same query id after NoHttpResponseException, causing QUERY_WITH_SAME_ID_IS_ALREADY_RUNNING

  ClickHouse/clickhouse-java#3174 · Filter by author billykern opened on Oct 1, 2026

• [client-v2] Convert String to DateTime

  area:data-typeclient-api-v2
  Task

  ClickHouse/clickhouse-java#3165 · Filter by author chernser opened on Sep 29, 2026 · 0.12.0
  2

• [client-v2] Convert String to Date

  area:data-typeclient-api-v2
  Task

  ClickHouse/clickhouse-java#3164 · Filter by author chernser opened on Sep 29, 2026 · 0.12.0

• [client-v2] Response silently truncated when a proxy ignores Accept-Encoding: lz4 (useHttpCompression mode)

  ClickHouse/clickhouse-java#3163 · Filter by author claude opened on Sep 29, 2026

• [client-v2] Native format: nested columns (Tuple/Map/Nested/Variant, Array of Nullable/Array/LowCardinality) are decoded row-wise and misread

  area:client-readbugclient-api-v2
  ClickHouse/clickhouse-java#3156 · Filter by author polyglotAI-bot opened on Sep 25, 2026
  1

• [client-v2] Native format: two rows are silently lost and returned as all-null at every block boundary

  area:client-readbugclient-api-v2
  ClickHouse/clickhouse-java#3151 · Filter by author polyglotAI-bot opened on Sep 25, 2026

• [auth] Support refresh tokens for OAuth

  area:integrationclient-api-v2jdbc-v2
  ClickHouse/clickhouse-java#3145 · Filter by author chernser opened on Sep 23, 2026 · 0.12.0

• jdbc-v2: ANTLR4 parser backends report a source table as the INSERT target, writing rows into the wrong table

  area:jdbc-insertarea:sql-parserbugjdbc-v2
  ClickHouse/clickhouse-java#3129 · Filter by author polyglotAI-bot opened on Sep 11, 2026

• [jdbc-v2] setObject(LocalDateTime) applies the JVM timezone and stores a shifted value

  area:data-typebugjdbc
  ClickHouse/clickhouse-java#3127 · Filter by author Kvel4 opened on Sep 11, 2026
  2

• [jdbc-v2] ResultSet label getters return null/0 for an unknown column label instead of throwing SQLException

  area:jdbc-readbugjdbc-v2
  ClickHouse/clickhouse-java#3125 · Filter by author polyglotAI-bot opened on Sep 11, 2026 · 0.12.0
  

• [client-v2] Allow QuerySettings in POJO queryAll overloads

  ClickHouse/clickhouse-java#3112 · Filter by author Nex1332 opened on Sep 9, 2026

• [examples] Remove old Spring example

  ClickHouse/clickhouse-java#3111 · Filter by author chernser opened on Sep 9, 2026 · 0.12.0
  1

  

• [client-v1] Every compressed read fails on ClickHouse 26.9+: Lz4InputStream hardcodes the LZ4 magic byte but the server default codec is now ZSTD

  area:networkbugclient-v1
  ClickHouse/clickhouse-java#3107 · Filter by author polyglotAI-bot opened on Sep 8, 2026

• socket_keepalive doesn't work with shaded clickhouse-jdbc

  bug
  ClickHouse/clickhouse-java#3092 · Filter by author ostinru opened on Sep 1, 2026 · 0.12.0
  9

• Progress Header Support

  ClickHouse/clickhouse-java#3080 · Filter by author chernser opened on Aug 26, 2026

• [jdbc-v2] Handle query timeout in the middle of stream

  jdbc-v2
  ClickHouse/clickhouse-java#3077 · Filter by author chernser opened on Aug 25, 2026 · 0.12.0
  2

• Flaky test: HttpTransportTests.testAccessTokenAuth / testBearerTokenAuth bind a random fixed port and fail with FatalStartupException

  bugclient-api-v2test
  ClickHouse/clickhouse-java#3076 · Filter by author polyglotAI-bot opened on Aug 25, 2026