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04/10/26/json format support #2823

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9ffd9a4
Implemented JSONEachrow support in client-v2
chernser Apr 10, 2026
090fb85
Added primitive tests for JSON each row
chernser Apr 10, 2026
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20 changes: 19 additions & 1 deletion client-v2/pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -88,8 +88,26 @@
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<scope>test</scope>
<version>${jackson.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>${gson.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>${project.parent.groupId}</groupId>
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8 changes: 8 additions & 0 deletions client-v2/src/main/java/com/clickhouse/client/api/Client.java
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Expand Up @@ -3,11 +3,14 @@
import com.clickhouse.client.api.command.CommandResponse;
import com.clickhouse.client.api.command.CommandSettings;
import com.clickhouse.client.api.data_formats.ClickHouseBinaryFormatReader;
import com.clickhouse.client.api.data_formats.JSONEachRowFormatReader;
import com.clickhouse.client.api.data_formats.NativeFormatReader;
import com.clickhouse.client.api.data_formats.RowBinaryFormatReader;
import com.clickhouse.client.api.data_formats.RowBinaryWithNamesAndTypesFormatReader;
import com.clickhouse.client.api.data_formats.RowBinaryWithNamesFormatReader;
import com.clickhouse.client.api.data_formats.internal.BinaryStreamReader;
import com.clickhouse.client.api.data_formats.internal.JsonParser;
import com.clickhouse.client.api.data_formats.internal.JsonParserFactory;
import com.clickhouse.client.api.data_formats.internal.MapBackedRecord;
import com.clickhouse.client.api.data_formats.internal.ProcessParser;
import com.clickhouse.client.api.enums.Protocol;
Expand Down Expand Up @@ -2077,6 +2080,11 @@ public ClickHouseBinaryFormatReader newBinaryFormatReader(QueryResponse response
reader = new RowBinaryFormatReader(response.getInputStream(), response.getSettings(), schema,
byteBufferPool, typeHintMapping);
break;
case JSONEachRow:
String jsonProcessor = ClientConfigProperties.JSON_PROCESSOR.getOrDefault(configuration);
JsonParser parser = JsonParserFactory.createParser(jsonProcessor, response.getInputStream());
reader = new JSONEachRowFormatReader(parser);
break;
default:
throw new IllegalArgumentException("Binary readers doesn't support format: " + response.getFormat());
}
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9 changes: 9 additions & 0 deletions client-v2/src/main/java/com/clickhouse/client/api/ClientConfigProperties.java
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Expand Up @@ -196,6 +196,15 @@ public Object parseValue(String value) {
* See <a href="https://clickhouse.com/docs/operations/settings/query-level#custom_settings">ClickHouse Docs</a>
*/
CUSTOM_SETTINGS_PREFIX("custom_settings_prefix", String.class, "custom_"),

/**
* Configures what JSON processor will be used for JSON formats. Choices:
* <ul>
* <li>JACKSON - uses Jackson library.</li>
* <li>GSON - uses Gson library.</li>
* </ul>
*/
JSON_PROCESSOR("json_processor", String.class, "JACKSON"),
;

private static final Logger LOG = LoggerFactory.getLogger(ClientConfigProperties.class);
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