[Data-Type] Integers #3298

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[Data-Type] Integers#3298

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area:data-typedata type processing issuesdata type processing issuesclient-api-v2jdbc-v2jdbc-v2 issuesjdbc-v2 issues

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chernser

opened on Nov 5, 2026

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Description

There is a list of issues linked to working with integers

What should be done

• review - if the issue is limitation, not related or else
• verify - is issue still reproducible
• fix - fix what is left

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1. chernser

   added

   client-api-v2

   jdbc-v2jdbc-v2 issuesjdbc-v2 issues

   area:data-typedata type processing issuesdata type processing issues

   on Nov 5, 2026
2. chernser

   added the

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   issue type on Nov 5, 2026
3. chernser

   added sub-issues on Nov 5, 2026

   • [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;" #3283
   • [client-v2] Native format: a LowCardinality column is read as plain values, desynchronizes the stream ("Non-empty typeName is required") #3193
   • [client-v2] Out-of-range numeric values are silently wrapped when inserted into Int32/Int64/UInt64 columns (Int8/Int16 correctly throw) #3176
   • [client-v2] Native format: two rows are silently lost and returned as all-null at every block boundary #3151
   • [client-v2] Compiled POJO setter emits invalid bytecode (VerifyError) when the column type does not match the primitive field type #2999
   • Document usage of JSONEachrow reader #2890
   • beta.row_binary_for_simple_insert fails on Uint64 values larger than long type passed as string #2619
   • UnknownException: (org.apache.spark.SparkSQLException) [UNRECOGNIZED_SQL_TYPE] Unrecognized SQL type - name: UInt64, id: OTHER. SQLSTATE: 42704 #2466
   • Cannot write AggregateFunction(groupBitmap, UInt64) via JDBC to spark #2362
   • [client-v2] Optimize RowBinaryFormatWriter by precompiling column serializers and reducing Object[] row-staging overhead #3289
   • jdbc-v2: Array#getResultSet() fails for createArrayOf arrays and geo columns (IndexOutOfBoundsException / wrong VALUE type) #3216
4. 40 remaining items

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5. chernser

   removed sub-issues on Nov 5, 2026

   • Regression on format JSONEachRow with JDBC v2 #2799
   • [client-v2] readVariant discards the active type discriminant — colliding Variant alternatives are indistinguishable #2901
   • [jdbc-v2] setObject(LocalDateTime) applies the JVM timezone and stores a shifted value #3127
   • [client-v2] Native format: nested columns (Tuple/Map/Nested/Variant, Array of Nullable/Array/LowCardinality) are decoded row-wise and misread #3156
   • client-v2: a self-referential collection in a Dynamic column hangs (array/List) or throws StackOverflowError (Map) instead of a clean exception #3177
   • [client-v2] Reading Array(IPv6) / Array(Nullable(IPv6)) fails when an element is an IPv4-mapped address (::ffff:a.b.c.d) #3192
   • [client-v2, jdbc-v2] JSONEachRow: a query that fails mid-stream on ClickHouse 25.8 returns the {"exception": ...} row as data and raises no error #3220
   • Reading Array(Nullable(DateTime64)) throws 'array element type mismatch' #3287
   • [client-v2] A Map/List/array bound to a Tuple query parameter is rendered as a Map/Array literal and fails with code 27 #3291
   • [jdbc-v2] setObject(ZonedDateTime) outside 1677-2262 silently stores a wrong DateTime64 value #3292
   • Example of migration from ClickHouseRowBinaryStream #2239
   • Document usage of JSONEachrow reader #2890
   • [client-v2] POJO serialization: Skipped fields still consume memory #2928
   • [client-v2] Native format: two rows are silently lost and returned as all-null at every block boundary #3151
   • [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;" #3283

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