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Reading Array(Nullable(DateTime64)) throws 'array element type mismatch' #3287

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#3293
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Reading Array(Nullable(DateTime64)) throws 'array element type mismatch'#3287
#3293
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Description

@anesterenok
anesterenok
opened on Nov 3, 2026

Description

Reading a column of type Array(Nullable(DateTime64(6, 'zone')))) fails unless all values are null.

Steps to reproduce

  1. Create a simple table and add two rows:
CREATE TABLE test(id Int64, col_timestamp Array(Nullable(DateTime64(6, 'UTC')))) ENGINE = MergeTree PRIMARY KEY (id);

INSERT INTO test VALUES (1, [null, null])(2, ['2026-01-01 13:34:56.780', '2025-10-20 08:32:13.678']);

  1. Execute select * from test with JDBC.

  2. At second ResultSet.next() an exception is thrown.

Error Log or Exception StackTrace

...
Caused by: java.sql.SQLException: Failed to read value for column col_timestamp
	at com.clickhouse.jdbc.internal.ExceptionUtils.toSqlState(ExceptionUtils.java:70)
	at com.clickhouse.jdbc.internal.ExceptionUtils.toSqlState(ExceptionUtils.java:41)
	at com.clickhouse.jdbc.ResultSetImpl.next(ResultSetImpl.java:156)
	at example.it.jdbc.BaseJdbcDataset.scan(BaseJdbcDataset.java:82)
	... 6 more
Caused by: com.clickhouse.client.api.ClientException: Failed to read value for column col_timestamp
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:307)
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:135)
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:117)
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:101)
	at com.clickhouse.client.api.data_formats.internal.AbstractBinaryFormatReader.readRecord(AbstractBinaryFormatReader.java:195)
	at com.clickhouse.client.api.data_formats.internal.AbstractBinaryFormatReader.readNextRecord(AbstractBinaryFormatReader.java:242)
	at com.clickhouse.client.api.data_formats.internal.AbstractBinaryFormatReader.next(AbstractBinaryFormatReader.java:277)
	at com.clickhouse.jdbc.ResultSetImpl.next(ResultSetImpl.java:145)
	... 7 more
Caused by: java.lang.IllegalArgumentException: Failed to set value at index: 0 value 2026-01-01T13:34:56.780Z[Etc/UTC] of class java.time.ZonedDateTime when array type is class [Ljava.time.LocalDateTime;
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader$ArrayValue.set(BinaryStreamReader.java:959)
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readArrayItem(BinaryStreamReader.java:807)
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readArray(BinaryStreamReader.java:785)
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:282)
	... 14 more
Caused by: java.lang.IllegalArgumentException: array element type mismatch
	at java.base/java.lang.reflect.Array.set(Native Method)
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader$ArrayValue.set(BinaryStreamReader.java:956)
	... 17 more

Expected Behaviour

No error. Executing same request from CLI client works just fine.

Code Example

see above

Configuration

Client Configuration

default

Environment

  • Cloud
  • Client version: driver 0.11-all
  • Language version: JDK 17
  • OS: Ubuntu 24

ClickHouse Server

  • ClickHouse Server version: 26.10
  • ClickHouse Server non-default settings, if any: none
  • CREATE TABLE statements for tables involved: see above

Activity

  1. anesterenok
    added
    bug
    on Nov 3, 2026

  2. anesterenok commented on Nov 3, 2026

    @anesterenok
    anesterenok
    on Nov 3, 2026
    Author

    Similar error also happens when trying to read a column of type Array(Nullable(Tuple(months Int32, days Int32, nanos Int64))):

    Caused by: java.lang.IllegalArgumentException: Failed to set value at index: 0 value [Ljava.lang.Object;@3c8b3a5b of class [Ljava.lang.Object; when array type is class [Ljava.util.List;
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader$ArrayValue.set(BinaryStreamReader.java:959) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readArrayItem(BinaryStreamReader.java:807) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readArray(BinaryStreamReader.java:785) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:282) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:135) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:117) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.BinaryStreamReader.readValue(BinaryStreamReader.java:101) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.AbstractBinaryFormatReader.readRecord(AbstractBinaryFormatReader.java:195) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.AbstractBinaryFormatReader.readNextRecord(AbstractBinaryFormatReader.java:242) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.client.api.data_formats.internal.AbstractBinaryFormatReader.next(AbstractBinaryFormatReader.java:282) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.clickhouse.jdbc.ResultSetImpl.next(ResultSetImpl.java:145) ~[clickhouse-jdbc-all-0.11.0.jar:clickhouse-jdbc-all 0.11.0 (revision: c1834d0)]
	at com.zaxxer.hikari.pool.HikariProxyResultSet.next(HikariProxyResultSet.java) ~[HikariCP-6.3.3.jar!/:?]
  3. payallenka
    added a commit that references this issue on Nov 4, 2026

    [client-v2] Type nullable arrays by the values read

    2bdba37
  4. chernser
    added a parent issue on Nov 5, 2026
  5. chernser
    removed a parent issue on Nov 5, 2026
  6. chernser
    added a parent issue on Nov 5, 2026
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