session: set request source to type of the prepared stmt for execute …

…stmt (pingcap#46348)

close pingcap#46349

session/session.go

@@ -2189,7 +2189,16 @@ func (s *session) ExecuteStmt(ctx context.Context, stmtNode ast.StmtNode) (sqlex
 		}
 	})
 
-	stmtLabel := ast.GetStmtLabel(stmtNode)
+	var stmtLabel string
+	if execStmt, ok := stmtNode.(*ast.ExecuteStmt); ok {
+		prepareStmt, err := plannercore.GetPreparedStmt(execStmt, s.sessionVars)
+		if err == nil && prepareStmt.PreparedAst != nil {
+			stmtLabel = ast.GetStmtLabel(prepareStmt.PreparedAst.Stmt)
+		}
+	}
+	if stmtLabel == "" {
+		stmtLabel = ast.GetStmtLabel(stmtNode)
+	}
 	s.setRequestSource(ctx, stmtLabel, stmtNode)
 
 	// Backup the original resource group name since sql hint might change it during optimization