Issues

• [client-v2] Optimize RowBinaryFormatWriter by precompiling column serializers and reducing Object[] row-staging overhead

  v2-feedback
  ClickHouse/clickhouse-java#3289 · Filter by author Harry262530 opened on Nov 3, 2026

• [jdbc-v2] Option to trim trailing NULs from FixedString on read

  area:data-typearea:jdbc-readjdbc-v2
  ClickHouse/clickhouse-java#3288 · Filter by author ShimonSte opened on Nov 3, 2026

• Reading Array(Nullable(DateTime64)) throws 'array element type mismatch'

  bug
  ClickHouse/clickhouse-java#3287 · Filter by author anesterenok opened on Nov 3, 2026

• QuerySettings.setUseTimeZone accepts unknown time zone ids and silently falls back to GMT

  ClickHouse/clickhouse-java#3286 · Filter by author pcbeingused333 opened on Nov 3, 2026

• Reading an array date value as LocalDate fails, same for other temporal types

  bug
  ClickHouse/clickhouse-java#3284 · Filter by author anesterenok opened on Nov 2, 2026
  1

• [client-v2] Reading Array(Nullable(UInt64)) fails: "Failed to set value ... of class java.math.BigInteger when array type is class [Lcom.clickhouse.data.value.UnsignedLong;"

  bug
  ClickHouse/clickhouse-java#3283 · Filter by author simondaudin opened on Nov 2, 2026

• [client-v2] Error handling in JSON format

  area:error-handlingclient-api-v2
  ClickHouse/clickhouse-java#3280 · Filter by author chernser opened on Oct 30, 2026

• Error handling the CTE INSERT command: Failed to parse SQL.

  area:sql-parserbugjdbc-v2
  ClickHouse/clickhouse-java#3279 · Filter by author fiend19961 opened on Oct 30, 2026 · 0.12.0

• [jdbc-v1] Statement.cancel() throws NOTHING_TO_KILL (785) on ClickHouse 26.11+ when the query is already finished

  area:generalbugjdbc-v1wontfix
  ClickHouse/clickhouse-java#3273 · Filter by author polyglotAI-bot opened on Oct 29, 2026
  1

• [jdbc-v2] Connection#getNetworkTimeout, getCatalog and setClientInfo do not throw on a closed connection

  bugjdbc-v2
  ClickHouse/clickhouse-java#3270 · Filter by author polyglotAI-bot opened on Oct 29, 2026

• [jdbc-v2] setNetworkTimeout is not applied to statements created before the call, RowBinary writer inserts, or the writer's schema lookup

  bugjdbc-v2
  ClickHouse/clickhouse-java#3268 · Filter by author polyglotAI-bot opened on Oct 29, 2026

• [jdbc-v2] Metadata - getPrimaryKeys

  area:jdbc-metadatajdbc-v2
  Bug

  ClickHouse/clickhouse-java#3263 · Filter by author chernser opened on Oct 29, 2026 · 0.12.0

• [jdbc-v2] Restoring network timeout to zero overrides configured socket_timeout

  ClickHouse/clickhouse-java#3260 · Filter by author ssouris-te opened on Oct 28, 2026

• [repo][epic] Review Packaging

  ClickHouse/clickhouse-java#3258 · Filter by author chernser opened on Oct 26, 2026

• [client-v2] insert() always sends the INSERT statement in the URL, so wide column lists fail with "HTML Form Exception: Field value too long" (http_max_field_value_size, 128 KiB)

  ClickHouse/clickhouse-java#3256 · Filter by author claude opened on Oct 25, 2026

• [jdbc-v2] Provide descriptions for Driver.getPropertyInfo configuration entries

  area:docsjdbc-v2
  ClickHouse/clickhouse-java#3255 · Filter by author chernser opened on Oct 22, 2026

• [client-v2] httpcomponents.httpclient.connect.time does not include the TCP connect or the TLS handshake

  area:networkbugclient-api-v2
  ClickHouse/clickhouse-java#3254 · Filter by author polyglotAI-bot opened on Oct 22, 2026

• [client-v2] Connect-time queue of the pooled connection factory grows without limit when no metrics registry is set

  area:networkbugclient-api-v2
  ClickHouse/clickhouse-java#3253 · Filter by author polyglotAI-bot opened on Oct 22, 2026

• [client-v2,jdbc-v2] Disable Apache HttpClient wire logging for managed connections

  area:generalclient-api-v2enhancementjdbc-v2
  ClickHouse/clickhouse-java#3251 · Filter by author chernser opened on Oct 22, 2026 · 0.12.0
  1

• [client-v2,jdbc-v2] Secure credentials

  area:generalclient-api-v2enhancementjdbc-v2
  ClickHouse/clickhouse-java#3248 · Filter by author chernser opened on Oct 22, 2026 · 0.12.0
  4

• Flaky test: client-v2 cluster legs — insert right after CREATE TABLE hangs 1800 s with UNKNOWN_STATUS_OF_INSERT (quorum never reached)

  bugclient-api-v2test
  ClickHouse/clickhouse-java#3246 · Filter by author polyglotAI-bot opened on Oct 21, 2026

• Caused by: org.apache.http.TruncatedChunkException: Truncated chunk ( expected size: 4096; actual size: 4088)

  bug
  ClickHouse/clickhouse-java#3244 · Filter by author nanjing922 opened on Oct 21, 2026
  4

• [v0.11.0] Fix Maven Central publishing failure with Maven 3.10.0

  ClickHouse/clickhouse-java#3241 · Filter by author chernser opened on Oct 21, 2026 · 0.11.0
  2

  

• [client-v2] Header value with two spaces, a tab, or edge spaces is sent as <Name>* and the server ignores it (wrong database, auth failure, lost headers)

  area:networkbugclient-api-v2
  ClickHouse/clickhouse-java#3227 · Filter by author polyglotAI-bot opened on Oct 19, 2026

• [client-v2, jdbc-v2] ClickStack Integration

  client-api-v2jdbc-v2
  Task

  ClickHouse/clickhouse-java#3221 · Filter by author chernser opened on Oct 16, 2026 · 0.12.0