Issues

• [client-v2] Time64/Duration parameter is formatted with the default locale, so a non-Latin numbering system emits unparsable digits

  ClickHouse/clickhouse-java#3308 · Filter by author claude opened on Nov 7, 2026

• [client-v2] Enum8/Enum16 insert accepts a non-member integer and uses Enum.ordinal(), silently storing values that are not enum members

  ClickHouse/clickhouse-java#3304 · Filter by author claude opened on Nov 5, 2026
  1

• [Data Types] Wrapper (Array, Tuple, Map, Variant, etc. )

  area:data-type
  Task

  ClickHouse/clickhouse-java#3299 · Filter by author chernser opened on Nov 5, 2026

• [Data-Type] Integers

  area:data-typeclient-api-v2jdbc-v2
  Task

  ClickHouse/clickhouse-java#3298 · Filter by author chernser opened on Nov 5, 2026

• [logging] Review Logging

  area:generalclient-api-v2enhancementjdbc-v2
  Task

  ClickHouse/clickhouse-java#3295 · Filter by author chernser opened on Nov 4, 2026 · 0.12.0

• [jdbc-v2] setObject(ZonedDateTime) outside 1677-2262 silently stores a wrong DateTime64 value

  ClickHouse/clickhouse-java#3292 · Filter by author krvikash opened on Nov 4, 2026

• [client-v2] A Map/List/array bound to a Tuple query parameter is rendered as a Map/Array literal and fails with code 27

  ClickHouse/clickhouse-java#3291 · Filter by author claude opened on Nov 3, 2026

• [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
  2

• [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 · 0.12.0

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

  bug
  ClickHouse/clickhouse-java#3287 · Filter by author anesterenok opened on Nov 3, 2026
  1

• 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] 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

• [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] 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