[client-v2] Issues with Data types #3205

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[client-v2] Issues with Data types#3205

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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 Oct 14, 2026

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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 Oct 14, 2026
2. chernser

   added sub-issues on Oct 14, 2026

   • [client-v2,jdbc-v2] Reading Array(Nullable(String)) with BinaryString enabled #2953
   • [client-v2] FixedString padding #2929
   • [client-v2] readVariant discards the active type discriminant — colliding Variant alternatives are indistinguishable #2901
   • When serialize FixedString and string is bigger than size defined in Table definition #2223
   • [client,jdbc] Support data type MacAddress #2643
   • beta.row_binary_for_simple_insert fails on Uint64 values larger than long type passed as string #2619
   • [client-v2] Native format: nested columns (Tuple/Map/Nested/Variant, Array of Nullable/Array/LowCardinality) are decoded row-wise and misread #3156
   • [client-v2] serializeArrayData silently writes zero bytes for a wrong-typed Array/geo value and desynchronizes the RowBinary stream #3041
   • Map(K, V) type support issue #3047
   • Regression in JDBC 0.9.8 when reading Array(Tuple(...)) with named tuple elements. #3045
3. chernser

   removed sub-issues on Nov 5, 2026

   • beta.row_binary_for_simple_insert fails on Uint64 values larger than long type passed as string #2619
   • [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
   • [client,jdbc] Support data type MacAddress #2643
   • 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

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