[CARBONDATA-2972] Debug Logs and function added for Adaptive Encoding

Added a function to get the type of encoding used. Added the debug log for checking which type of encoding is used

This closes #2758

core/src/main/java/org/apache/carbondata/core/datastore/page/encoding/ColumnPageEncoder.java

@@ -78,6 +78,14 @@ public DataType getTargetDataType(ColumnPage inputPage) {
     }
   }
 
+  public Encoding getEncodingType() {
+    List<Encoding> currEncodingList = getEncodingList();
+    if (CarbonUtil.isEncodedWithMeta(currEncodingList)) {
+      return currEncodingList.get(0);
+    }
+    return null;
+  }
+
   /**
    * Return a encoded column page by encoding the input page
    * The encoded binary data and metadata are wrapped in encoding column page

processing/src/main/java/org/apache/carbondata/processing/store/TablePage.java

@@ -424,7 +424,8 @@ private EncodedColumnPage[] encodeAndCompressDimensions()
                   "Encoder result ---> Source data type: " + noDictDimensionPages[noDictIndex]
                       .getDataType().getName() + " Destination data type: " + targetDataType
                       .getName() + " for the column: " + noDictDimensionPages[noDictIndex]
-                      .getColumnSpec().getFieldName());
+                      .getColumnSpec().getFieldName() + " having encoding type: "
+                      + columnPageEncoder.getEncodingType());
             }
           }
           noDictIndex++;