[Data Types] Wrapper (Array, Tuple, Map, Variant, etc. ) #3299

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[Data Types] Wrapper (Array, Tuple, Map, Variant, etc. )#3299

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area:data-typedata type processing issuesdata type processing issues

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chernser

opened on Nov 5, 2026

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Description

There is a list of wrapper type related issues that we need to address:

• review - if issue real problem, question or already fixed
• verify - that issue still exists
• fix - make actual change

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1. chernser

   added

   area:data-typedata type processing issuesdata type processing issues

   on Nov 5, 2026
2. chernser

   added the

   Task

   issue type on Nov 5, 2026
3. chernser

   added sub-issues on Nov 5, 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 #3291
   • Reading Array(Nullable(DateTime64)) throws 'array element type mismatch' #3287
   • Reading an array date value as LocalDate fails, same for other temporal types #3284
   • [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] Reading Array(IPv6) / Array(Nullable(IPv6)) fails when an element is an IPv4-mapped address (::ffff:a.b.c.d) #3192
   • 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] Native format: nested columns (Tuple/Map/Nested/Variant, Array of Nullable/Array/LowCardinality) are decoded row-wise and misread #3156
   • [client-v2] readVariant discards the active type discriminant — colliding Variant alternatives are indistinguishable #2901
   • POJO serializer cannot handle nested custom objects with Nested types #2709
   • [client-v2] Implement Streaming API for Binary formats #2665
   • [client,jdbc] Support data type MacAddress #2643
   • getBlob implementation #2558
4. 2 remaining items

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5. chernser

   added sub-issues on Nov 5, 2026

   • How to insert Array(String) using clickhouse-http-client 4.6 (RowBinary) ? #1425
   • jdbc-v2: Array#getResultSet() fails for createArrayOf arrays and geo columns (IndexOutOfBoundsException / wrong VALUE type) #3216
   • [client-v2] Native format: two rows are silently lost and returned as all-null at every block boundary #3151
   • [Client, JDBC] Support Aggregate Functions #2599
   • Regression on format JSONEachRow with JDBC v2 #2799
   • [client-v2] JSON Support #1833
   • Map(K, V) type support issue #3047
   • Regression in JDBC 0.9.8 when reading Array(Tuple(...)) with named tuple elements. #3045
   • [client-v2,jdbc-v2] Reading Array(Nullable(String)) with BinaryString enabled #2953
6. chernser

   removed sub-issues on Nov 5, 2026

   • [client-v2] JSON Support #1833
   • [Client, JDBC] Support Aggregate Functions #2599
   • Support Protobuf insert #2187
   • getBlob implementation #2558
   • [client,jdbc] Support data type MacAddress #2643
   • [client-v2] Implement Streaming API for Binary formats #2665

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