fixed wasNull method to not reset the flag and added test. Fixed boolean convertion to a number

Author: chernser

client-v2/src/main/java/com/clickhouse/client/api/data_formats/internal/ValueConverters.java

@@ -120,7 +120,7 @@ public Boolean convertBooleanToBoolean(Object value) {
     }
 
     public Number convertBooleanToNumber(Object value) {
-        return ((Number) (((Boolean)value) ? 1 : 0)).longValue();
+        return ((Boolean) value) ? 1L : 0L;
     }
 
     public String convertBooleanToString(Object value) {
@@ -227,15 +227,15 @@ public Timestamp convertSqlTimestampToSqlTimestamp(Object value) {
     }
 
     public String convertDateToString(Object value) {
-        return ((Date)value).toString();
+        return value.toString();
     }
 
     public String convertTimeToString(Object value) {
-        return ((Time) value).toString();
+        return value.toString();
     }
 
     public String convertTimestampToString(Object value) {
-        return  ((Timestamp) value).toString();
+        return  value.toString();
     }
 
     /**

jdbc-v2/src/main/java/com/clickhouse/jdbc/types/ArrayResultSet.java

@@ -159,9 +159,7 @@ public void close() throws SQLException {
 
     @Override
     public boolean wasNull() throws SQLException {
-        boolean tmp = wasNull;
-        wasNull = false;
-        return tmp;
+        return wasNull;
     }
 
     @Override

jdbc-v2/src/test/java/com/clickhouse/jdbc/types/ArrayResultSetTest.java

@@ -141,11 +141,13 @@ void testNullValues() throws SQLException {
         assertFalse(rs.wasNull());
         assertEquals(rs.getInt(2), array[0]);
         assertFalse(rs.wasNull());
+        assertFalse(rs.wasNull());
 
         rs.next();
         assertFalse(rs.wasNull());
         assertEquals(rs.getInt(2), 0);
         assertTrue(rs.wasNull());
+        assertTrue(rs.wasNull());
     }
 
     @Test(dataProvider = "testPrimitiveValues")