Adding issue #2266 tests (#2295)

* Adding issue #2266 tests

* Adding to getArray wasNull value change if the retrieve data is null

Author: mzitnik

jdbc-v2/src/main/java/com/clickhouse/jdbc/ResultSetImpl.java

@@ -11,6 +11,7 @@
 import java.time.ZonedDateTime;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
+import java.util.List;
 import java.util.Map;
 
 import com.clickhouse.client.api.data_formats.ClickHouseBinaryFormatReader;
@@ -1025,7 +1026,9 @@ public java.sql.Array getArray(String columnLabel) throws SQLException {
         checkClosed();
         try {
             ClickHouseColumn column = getSchema().getColumnByName(columnLabel);
-            return new Array(reader.getList(columnLabel),
+            List<Object> lstObj = reader.getList(columnLabel);
+            wasNull = lstObj == null;
+            return new Array(lstObj,
                     column.getArrayBaseColumn().getDataType().name(),
                     JdbcUtils.convertToSqlType(column.getArrayBaseColumn().getDataType()).getVendorTypeNumber());
         } catch (Exception e) {

jdbc-v2/src/test/java/com/clickhouse/jdbc/StatementTest.java

@@ -671,4 +671,44 @@ public void testNullableFixedStringType() throws Exception {
             }
         }
     }
+
+    @Test(groups = { "integration" })
+    public void testWasNullFlagArray() throws Exception {
+        try (Connection conn = getJdbcConnection()) {
+            String sql = "SELECT NULL, ['value1', 'value2']";
+            Statement stmt = conn.createStatement();
+            stmt.executeQuery(sql);
+            ResultSet rs = stmt.getResultSet();
+            assertTrue(rs.next());
+            int val = rs.getInt(1);
+            assertTrue(rs.wasNull());
+            Array arr = rs.getArray(2);
+            assertFalse(rs.wasNull());
+            assertNotNull(arr);
+            Object[] values = (Object[]) arr.getArray();
+            assertNotNull(values);
+            assertEquals(values.length, 2);
+            assertEquals(values[0], "value1");
+            assertEquals(values[1], "value2");
+        }
+
+        try (Connection conn = getJdbcConnection()) {
+            String sql = "SELECT NULL, ['value1', 'value2'] AS array";
+            Statement stmt = conn.createStatement();
+            stmt.executeQuery(sql);
+            ResultSet rs = stmt.getResultSet();
+            assertTrue(rs.next());
+            int val = rs.getInt(1);
+            assertTrue(rs.wasNull());
+            Array arr = rs.getArray("array");
+            assertFalse(rs.wasNull());
+            assertNotNull(arr);
+            Object[] values = (Object[]) arr.getArray();
+            assertNotNull(values);
+            assertEquals(values.length, 2);
+            assertEquals(values[0], "value1");
+            assertEquals(values[1], "value2");
+        }
+    }
+
 }