[NO ISSUE][*DB] += exception helper method

Change-Id: I7d7aee2fb2bb25a59d2825761b127f969348666b
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/8163
Reviewed-by: Murtadha Hubail <mhubail@apache.org>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/exceptions/ExceptionUtils.java b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/exceptions/ExceptionUtils.java
index 359054e..1f42771 100644
--- a/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/exceptions/ExceptionUtils.java
+++ b/asterixdb/asterix-common/src/main/java/org/apache/asterix/common/exceptions/ExceptionUtils.java
@@ -21,6 +21,7 @@
 import java.util.function.Predicate;
 
 import org.apache.hyracks.api.exceptions.HyracksDataException;
+import org.apache.hyracks.api.exceptions.IFormattedException;
 
 public class ExceptionUtils {
     public static final String INCORRECT_PARAMETER = "Incorrect parameter.\n";
@@ -85,4 +86,18 @@
         }
         return test.test(e);
     }
+
+    /**
+     * Unwraps enclosed exceptions until a non-product exception is found, otherwise returns the root production
+     * exception
+     */
+    public static Throwable unwrap(Throwable e) {
+        Throwable current = e;
+        Throwable cause = e.getCause();
+        while (cause != null && cause != current && current instanceof IFormattedException) {
+            current = cause;
+            cause = current.getCause();
+        }
+        return current;
+    }
 }