diff --git a/core/src/main/resources/filodb-defaults.conf b/core/src/main/resources/filodb-defaults.conf
index 27032f5d68..565c21ddd2 100644
--- a/core/src/main/resources/filodb-defaults.conf
+++ b/core/src/main/resources/filodb-defaults.conf
@@ -610,6 +610,9 @@ filodb {
       # These labels will be dropped from every exported row.
       drop-labels = ["_ws_", "drop-label1"]
 
+      # default label value to export when an expected dynamic column does not exist
+      default-dynamic-column-value = "none"
+
       # Each row's labels are compared against all rule-group keys. If a match is found,
       #   the row's labels are compared *sequentially* against each of the group's rules until
       #   a rule meets both of the following criteria:
diff --git a/spark-jobs/src/main/scala/filodb/downsampler/chunk/BatchExporter.scala b/spark-jobs/src/main/scala/filodb/downsampler/chunk/BatchExporter.scala
index faa37adde8..b16c288a1a 100644
--- a/spark-jobs/src/main/scala/filodb/downsampler/chunk/BatchExporter.scala
+++ b/spark-jobs/src/main/scala/filodb/downsampler/chunk/BatchExporter.scala
@@ -161,7 +161,7 @@ case class BatchExporter(downsamplerSettings: DownsamplerSettings, userStartTime
     // append all dynamic column values
     exportTableConfig.labelColumnMapping.foreach { pair =>
       val labelValue = exportData.labels.get(pair._1)
-      dataSeq.append(labelValue.getOrElse(""))
+      dataSeq.append(labelValue.getOrElse(downsamplerSettings.exportDefaultDynamicColumnValue))
     }
     // append all fixed column values
     dataSeq.append(
diff --git a/spark-jobs/src/main/scala/filodb/downsampler/chunk/DownsamplerSettings.scala b/spark-jobs/src/main/scala/filodb/downsampler/chunk/DownsamplerSettings.scala
index dcc8cdddab..aec6bf1d83 100644
--- a/spark-jobs/src/main/scala/filodb/downsampler/chunk/DownsamplerSettings.scala
+++ b/spark-jobs/src/main/scala/filodb/downsampler/chunk/DownsamplerSettings.scala
@@ -86,6 +86,9 @@ class DownsamplerSettings(conf: Config = ConfigFactory.empty()) extends Serializ
 
   @transient lazy val exportDropLabels = downsamplerConfig.as[Seq[String]]("data-export.drop-labels")
 
+  @transient lazy val exportDefaultDynamicColumnValue =
+    downsamplerConfig.as[String]("data-export.default-dynamic-column-value")
+
   @transient lazy val exportKeyToRules = {
     val keyRulesPairs = downsamplerConfig.as[Seq[Config]]("data-export.groups").map { group =>
       val key = group.as[Seq[String]]("key")