fix #4818

plugins/transforms/concatfields/src/main/java/org/apache/hop/pipeline/transforms/concatfields/ConcatFields.java

@@ -24,6 +24,7 @@
 import org.apache.hop.core.exception.HopValueException;
 import org.apache.hop.core.row.IValueMeta;
 import org.apache.hop.core.row.RowDataUtil;
+import org.apache.hop.core.row.value.ValueMetaBase;
 import org.apache.hop.core.util.StringUtil;
 import org.apache.hop.i18n.BaseMessages;
 import org.apache.hop.pipeline.Pipeline;
@@ -157,7 +158,8 @@ private Object[] concatFields(Object[] inputRowData) throws HopException {
         nullString = Const.NVL(field.getNullString(), "");
       }
 
-      concatField(targetString, valueMeta, valueData, nullString);
+      String trimType = data.trimType[i];
+      concatField(targetString, valueMeta, valueData, nullString, trimType);
     }
 
     outputRowData[data.outputRowMeta.size() - 1] = targetString.toString();
@@ -166,13 +168,21 @@ private Object[] concatFields(Object[] inputRowData) throws HopException {
   }
 
   private void concatField(
-      StringBuilder targetField, IValueMeta valueMeta, Object valueData, String nullString)
+      StringBuilder targetField,
+      IValueMeta valueMeta,
+      Object valueData,
+      String nullString,
+      String trimType)
       throws HopValueException {
 
     if (valueMeta.isNull(valueData)) {
       targetField.append(nullString);
     } else {
-      targetField.append(valueMeta.getString(valueData));
+      if (trimType != null) {
+        targetField.append(
+            Const.trimToType(
+                valueMeta.getString(valueData), ValueMetaBase.getTrimTypeByCode(trimType)));
+      }
     }
   }
 
@@ -220,12 +230,18 @@ private void initStringDataFields() {
     }
 
     data.stringNullValue = new String[meta.getOutputFields().size()];
+    data.trimType = new String[meta.getOutputFields().size()];
+
     for (int i = 0; i < meta.getOutputFields().size(); i++) {
       data.stringNullValue[i] = "";
       String nullString = meta.getOutputFields().get(i).getNullString();
       if (!StringUtil.isEmpty(nullString)) {
         data.stringNullValue[i] = nullString;
       }
+      String trimType = meta.getOutputFields().get(i).getTrimType();
+      if (!StringUtil.isEmpty(trimType)) {
+        data.trimType[i] = trimType;
+      }
     }
   }
 

plugins/transforms/concatfields/src/main/java/org/apache/hop/pipeline/transforms/concatfields/ConcatFieldsData.java

@@ -37,6 +37,9 @@ public class ConcatFieldsData extends BaseTransformData implements ITransformDat
   public String stringSeparator;
   public String stringEnclosure;
   public String[] stringNullValue;
+
+  public String[] trimType;
+
   public int targetFieldLength; // for fast data dump (StringBuilder size)
 
   public ConcatFieldsData() {

plugins/transforms/concatfields/src/main/java/org/apache/hop/pipeline/transforms/concatfields/ConcatFieldsMeta.java

@@ -51,6 +51,10 @@
 public class ConcatFieldsMeta extends BaseTransformMeta<ConcatFields, ConcatFieldsData> {
   private static final Class<?> PKG = ConcatFieldsMeta.class;
 
+  public static final String TRIM_TYPE_LEFT = "left";
+  public static final String TRIM_TYPE_RIGHT = "right";
+  public static final String TRIM_TYPE_BOTH = "both";
+
   /** The separator to choose for the CSV file */
   @HopMetadataProperty(key = "separator", injectionKey = "SEPARATOR")
   private String separator;