diff --git a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/tablesChart/TablesPlotOpDesc.scala b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/tablesChart/TablesPlotOpDesc.scala
index dcd4c399297..bf230162759 100644
--- a/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/tablesChart/TablesPlotOpDesc.scala
+++ b/common/workflow-operator/src/main/scala/org/apache/texera/amber/operator/visualization/tablesChart/TablesPlotOpDesc.scala
@@ -36,7 +36,10 @@ class TablesPlotOpDesc extends PythonOperatorDescriptor {
   var includedColumns: List[TablesConfig] = List()
 
   private def getAttributes: String =
-    includedColumns.map(c => pyb"""${c.attributeName}""").mkString("','")
+    // Join with a plain comma: each column renders to a decode_python_template(...)
+    // call, so joining with the literal ',' would put a string right after a call
+    // and produce invalid Python.
+    includedColumns.map(c => pyb"""${c.attributeName}""").mkString(",")
 
   def manipulateTable(): PythonTemplateBuilder = {
     assert(includedColumns.nonEmpty, "Included Columns cannot be empty")
diff --git a/common/workflow-operator/src/test/scala/org/apache/texera/amber/operator/visualization/tablesChart/TablesPlotOpDescSpec.scala b/common/workflow-operator/src/test/scala/org/apache/texera/amber/operator/visualization/tablesChart/TablesPlotOpDescSpec.scala
index ea772521094..cc191139060 100644
--- a/common/workflow-operator/src/test/scala/org/apache/texera/amber/operator/visualization/tablesChart/TablesPlotOpDescSpec.scala
+++ b/common/workflow-operator/src/test/scala/org/apache/texera/amber/operator/visualization/tablesChart/TablesPlotOpDescSpec.scala
@@ -77,4 +77,15 @@ class TablesPlotOpDescSpec extends AnyFlatSpec with BeforeAndAfter with Matchers
     assert(carries(code, "col_two"))
     code should include("class TableChartOperator(UDFTableOperator)")
   }
+
+  it should "join multiple columns with a comma, not the literal ',' (valid Python)" in {
+    // Each column renders to a decode(...) call, so they must be comma-joined;
+    // joining with the literal ',' puts a string right after a call (invalid Python).
+    opDesc.includedColumns = List(column("col_one"), column("col_two"))
+    val code = opDesc.generatePythonCode()
+    code should include(
+      s"self.decode_python_template('${b64("col_one")}'),self.decode_python_template('${b64("col_two")}')"
+    )
+    code should not include "')','"
+  }
 }