Added reader for JSONEachRow format. Updated documentation and examples

Author: chernser

clickhouse-data/src/main/java/com/clickhouse/data/ClickHouseDataType.java

@@ -177,7 +177,7 @@ public static Map<Class<?>, Integer> buildVariantMapping(List<ClickHouseDataType
         return variantMapping;
     }
 
-    static final Map<ClickHouseDataType, Set<Class<?>>> DATA_TYPE_TO_CLASS = dataTypeClassMap();
+    public static final Map<ClickHouseDataType, Set<Class<?>>> DATA_TYPE_TO_CLASS = Collections.unmodifiableMap(dataTypeClassMap());
     static Map<ClickHouseDataType, Set<Class<?>>> dataTypeClassMap() {
         Map<ClickHouseDataType, Set<Class<?>>> map = new HashMap<>();
 

client-v2/pom.xml

@@ -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>

client-v2/src/main/java/com/clickhouse/client/api/Client.java

@@ -1651,6 +1651,7 @@ public CompletableFuture<QueryResponse> query(String sqlQuery, Map<String, Objec
         if (requestSettings.getFormat() == null) {
             requestSettings.setFormat(ClickHouseFormat.RowBinaryWithNamesAndTypes);
         }
+        applyFormatSpecificSettings(requestSettings);
         ClientStatisticsHolder clientStats = new ClientStatisticsHolder();
         clientStats.start(ClientMetrics.OP_DURATION);
 
@@ -2242,6 +2243,30 @@ private Map<String, Object> buildRequestSettings(Map<String, Object> opSettings)
         return requestSettings;
     }
 
+    /**
+     * Applies format-specific server-side settings to the already merged request settings.
+     * Must be called after {@link #buildRequestSettings(Map)} and after the request format has been resolved
+     * (either provided by the caller or defaulted), so that the inspected format reflects the final value.
+     *
+     * <p>For {@link ClickHouseFormat#JSONEachRow}, callers may opt in to plain JSON numbers by setting
+     * {@link ClientConfigProperties#JSON_DISABLE_NUMBER_QUOTING}. Explicit server settings are otherwise
+     * left untouched.</p>
+     * <ul>
+     *     <li>{@code output_format_json_quote_64bit_integers}</li>
+     *     <li>{@code output_format_json_quote_64bit_floats}</li>
+     *     <li>{@code output_format_json_quote_decimals}</li>
+     * </ul>
+     */
+    private static void applyFormatSpecificSettings(QuerySettings requestSettings) {
+        boolean disableNumberQuoting = ClientConfigProperties.JSON_DISABLE_NUMBER_QUOTING
+                .getOrDefault(requestSettings.getAllSettings());
+        if (requestSettings.getFormat() == ClickHouseFormat.JSONEachRow && disableNumberQuoting) {
+            requestSettings.serverSetting("output_format_json_quote_64bit_integers", "0");
+            requestSettings.serverSetting("output_format_json_quote_64bit_floats", "0");
+            requestSettings.serverSetting("output_format_json_quote_decimals", "0");
+        }
+    }
+
     private Duration durationSince(long sinceNanos) {
         return Duration.ofNanos(System.nanoTime() - sinceNanos);
     }

client-v2/src/main/java/com/clickhouse/client/api/ClientConfigProperties.java

@@ -190,6 +190,11 @@ public Object parseValue(String value) {
      */
     HTTP_SEND_PARAMS_IN_BODY("client.http.use_form_request_for_query", Boolean.class, "false"),
 
+    /**
+     * When enabled for JSONEachRow queries, asks ClickHouse to emit large integer,
+     * floating-point, and decimal values as JSON numbers instead of quoted strings.
+     */
+    JSON_DISABLE_NUMBER_QUOTING("json_disable_number_quoting", Boolean.class, "false"),
 
     /**
      *  Prefix for custom settings. Should be aligned with server configuration.