Merge branch 'joe_explain_zero_rows_warning' into 'master'

feat (UI): Display warning when a plan returns zero rows

See merge request postgres-ai/database-lab!943

Author: bogdan-ts

ui/packages/platform/src/pages/JoeSessionCommand/JoeSessionCommandWrapper.jsx

@@ -38,6 +38,9 @@ export const JoeSessionCommandWrapper = (props) => {
       bottomSpace: {
         ...styles.bottomSpace,
       },
+      warningContainer: {
+        marginTop: theme.spacing(2)
+      }
     }),
     { index: 1 },
   )

ui/packages/platform/src/pages/JoeSessionCommand/index.js

@@ -35,6 +35,7 @@ import Permissions from 'utils/permissions';
 import format from 'utils/format';
 
 import { TabPanel } from './TabPanel';
+import Alert from "@mui/material/Alert";
 
 const hashLinkVisualizePrefix = 'visualize-';
 
@@ -139,6 +140,19 @@ class JoeSessionCommand extends Component {
     return !!data && data.command === 'explain';
   };
 
+  planHasNoRows = () => {
+    if (!this.isExplain()) return false;
+    const data = this.getCommandData();
+    const planExecJson = data && data.planExecJson;
+    if (!planExecJson) return false;
+
+    const planExecJsonParsed = JSON.parse(planExecJson);
+    if (!Array.isArray(planExecJsonParsed) || planExecJsonParsed.length === 0) return false;
+
+    const plan = planExecJsonParsed[0] && planExecJsonParsed[0]["Plan"];
+    return plan && plan["Actual Rows"] === 0;
+  }
+
   showExternalVisualization = (type) => {
     const data = this.getCommandData();
 
@@ -351,6 +365,11 @@ class JoeSessionCommand extends Component {
           </div>
         }
 
+        {this.planHasNoRows() && <div className={classes.warningContainer}>
+          <Alert severity="warning">Query returned 0 rows. This may not reflect production performance or use the same query plan. If you expect results, try adjusting parameters (e.g., different ID values).
+</Alert>
+        </div>}
+
         <div>
           <h4>Author:</h4>
           <p>