bigdecimal support

src/main/java/ru/yandex/clickhouse/response/AbstractResultSet.java

@@ -66,7 +66,6 @@ public double getDouble(int columnIndex) throws SQLException {
     }
 
     @Override
-    @Deprecated
     public BigDecimal getBigDecimal(int columnIndex, int scale) throws SQLException {
         throw new UnsupportedOperationException();
     }
@@ -148,7 +147,6 @@ public double getDouble(String columnLabel) throws SQLException {
     }
 
     @Override
-    @Deprecated
     public BigDecimal getBigDecimal(String columnLabel, int scale) throws SQLException {
         throw new UnsupportedOperationException();
     }

src/main/java/ru/yandex/clickhouse/response/ClickHouseResultSet.java

@@ -4,6 +4,7 @@
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.math.BigDecimal;
 import java.sql.*;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
@@ -437,4 +438,34 @@ public <T> T getObject(String columnLabel, Class<T> type) throws SQLException {
     public ByteFragment[] getValues() {
         return values;
     }
-}
+
+    @Override
+    public BigDecimal getBigDecimal(String columnLabel)  {
+        return getBigDecimal(asColNum(columnLabel));
+    }
+
+    @Override
+    public BigDecimal getBigDecimal(int columnIndex)  {
+        String string = getString(columnIndex);
+        if (string == null) {
+            return null;
+        }
+        return new BigDecimal(string);
+    }
+
+
+    @Override
+    public BigDecimal getBigDecimal(String columnLabel, int scale)  {
+        return getBigDecimal(asColNum(columnLabel), scale);
+    }
+
+    @Override
+    public BigDecimal getBigDecimal(int columnIndex, int scale)  {
+        String string = getString(columnIndex);
+        if (string == null) {
+            return null;
+        }
+        BigDecimal result = new BigDecimal(string);
+        return result.setScale(scale, BigDecimal.ROUND_HALF_UP);
+    }
+}