fixed the JDBC version in database metadata

Author: chernser

jdbc-v2/src/main/java/com/clickhouse/jdbc/metadata/DatabaseMetaDataImpl.java

@@ -32,6 +32,9 @@
 public class DatabaseMetaDataImpl implements java.sql.DatabaseMetaData, JdbcV2Wrapper {
     private static final Logger log = LoggerFactory.getLogger(DatabaseMetaDataImpl.class);
 
+    private static final int JDBC_SPEC_MAJOR_VERSION = 4;
+    private static final int JDBC_SPEC_MINOR_VERSION = 2;
+
     public enum TableType {
         DICTIONARY("DICTIONARY"),
         LOG_TABLE("LOG TABLE"),
@@ -1410,12 +1413,12 @@ public int getDatabaseMinorVersion() throws SQLException {
 
     @Override
     public int getJDBCMajorVersion() throws SQLException {
-        return Driver.getDriverMajorVersion();
+        return JDBC_SPEC_MAJOR_VERSION;
     }
 
     @Override
     public int getJDBCMinorVersion() throws SQLException {
-        return Driver.getDriverMinorVersion();
+        return JDBC_SPEC_MINOR_VERSION;
     }
 
     @Override

jdbc-v2/src/test/java/com/clickhouse/jdbc/metadata/DatabaseMetaDataTest.java

@@ -248,8 +248,8 @@ public void testSupportFlags() throws Exception {
             assertEquals(dbmd.supportsMultipleOpenResults(), false);
             assertEquals(dbmd.supportsGetGeneratedKeys(), false);
             assertEquals(dbmd.getResultSetHoldability(), 1);
-            assertEquals(dbmd.getJDBCMajorVersion(), 9);
-            assertEquals(dbmd.getJDBCMinorVersion(), 6);
+            assertEquals(dbmd.getJDBCMajorVersion(), 4); // Latest major version (since java 6).
+            assertEquals(dbmd.getJDBCMinorVersion(), 2); // Most supported minor version (since java 8).
             assertEquals(dbmd.getSQLStateType(), 2);
             assertEquals(dbmd.supportsStatementPooling(), false);
             assertEquals(dbmd.getRowIdLifetime(), ROWID_UNSUPPORTED);