[3.0][fix](oracle scan) Fix performance issues caused by version judg…

…ment (#41513)

pick (#41407)

fe/be-java-extensions/jdbc-scanner/src/main/java/org/apache/doris/jdbc/OracleJdbcExecutor.java

@@ -39,9 +39,11 @@
 public class OracleJdbcExecutor extends BaseJdbcExecutor {
     private static final Logger LOG = Logger.getLogger(OracleJdbcExecutor.class);
     private final CharsetDecoder utf8Decoder = StandardCharsets.UTF_8.newDecoder();
+    private final boolean isNewJdbcVersion;
 
     public OracleJdbcExecutor(byte[] thriftParams) throws Exception {
         super(thriftParams);
+        isNewJdbcVersion = isJdbcVersionGreaterThanOrEqualTo("12.2.0");
     }
 
     @Override
@@ -65,7 +67,7 @@ protected void initializeBlock(int columnCount, String[] replaceStringList, int
 
     @Override
     protected Object getColumnValue(int columnIndex, ColumnType type, String[] replaceStringList) throws SQLException {
-        if (isJdbcVersionGreaterThanOrEqualTo("12.2.0")) {
+        if (isNewJdbcVersion) {
             return newGetColumnValue(columnIndex, type, replaceStringList);
         } else {
             return oldGetColumnValue(columnIndex, type, replaceStringList);