#1653 - ENH: Add support for ClickHouse database

With array type conversion for primitive arrays

src/main/java/io/ebean/config/dbplatform/clickhouse/ClickHousePlatform.java

@@ -49,4 +49,10 @@ public class ClickHousePlatform extends DatabasePlatform {
     dbTypeMap.put(DbType.INET, new DbPlatformType("String", false));
     dbTypeMap.put(DbType.CDIR, new DbPlatformType("String", false));
   }
+
+  @Override
+  public boolean isNativeArrayType() {
+    return true;
+  }
+
 }

src/main/java/io/ebeaninternal/server/type/ScalarTypeArrayBase.java

@@ -18,13 +18,53 @@ abstract class ScalarTypeArrayBase<T> extends ScalarTypeJsonCollection<T> {
       return null;
     } else {
       try {
-        return fromArray((Object[]) array.getArray());
+        return fromArray(convertArray(array.getArray()));
       } finally {
         array.free();
       }
     }
   }
 
+  private Object[] convertArray(Object array) {
+    if (array instanceof Object[]) {
+      return (Object[]) array;
+    }
+    if (array instanceof long[]) {
+      return convertLongs((long[]) array);
+    }
+    if (array instanceof int[]) {
+      return convertInts((int[]) array);
+    }
+    if (array instanceof double[]) {
+      return convertDoubles((double[]) array);
+    }
+    throw new IllegalArgumentException("Unable to convert array " + array);
+  }
+
+  private Object[] convertLongs(long[] o) {
+    Long[] list = new Long[o.length];
+    for (int i = 0; i < o.length; i++) {
+      list[i] = o[i];
+    }
+    return list;
+  }
+
+  private Object[] convertInts(int[] o) {
+    Integer[] list = new Integer[o.length];
+    for (int i = 0; i < o.length; i++) {
+      list[i] = o[i];
+    }
+    return list;
+  }
+
+  private Object[] convertDoubles(double[] o) {
+    Double[] list = new Double[o.length];
+    for (int i = 0; i < o.length; i++) {
+      list[i] = o[i];
+    }
+    return list;
+  }
+
   protected abstract T fromArray(Object[] array1);
 
 }