fix: Fix invalid valueExpression (#1161)

Author: pulpdrew

.changeset/rotten-pigs-invite.md

@@ -0,0 +1,5 @@
+---
+"@hyperdx/common-utils": patch
+---
+
+fix: Fix invalid valueExpression

packages/common-utils/src/renderChartConfig.ts

@@ -962,8 +962,8 @@ async function translateMetricChartConfig(
     );
 
     const bucketValueExpr = _select.isDelta
-      ? renderDeltaExpression(chartConfig, _select.valueExpression)
-      : `last_value(${_select.valueExpression})`;
+      ? renderDeltaExpression(chartConfig, 'Value')
+      : `last_value(Value)`;
 
     return {
       ...restChartConfig,