Handle EXECUTE without statement name

Author: Dandandan

datafusion/sql/src/statement.rs

@@ -892,8 +892,12 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
                     .map(|expr| self.sql_to_expr(expr, &empty_schema, planner_context))
                     .collect::<Result<Vec<Expr>>>()?;
 
+                let name = name.ok_or_else(|| {
+                    plan_datafusion_err!("EXECUTE statement requires a name")
+                })?;
+
                 Ok(LogicalPlan::Statement(PlanStatement::Execute(Execute {
-                    name: object_name_to_string(&name.unwrap()),
+                    name: object_name_to_string(&name),
                     parameters,
                 })))
             }

datafusion/sqllogictest/test_files/prepare.slt

@@ -53,6 +53,22 @@ PREPARE my_plan(INT, INT) AS SELECT 1 + $1;
 statement error SQL error: ParserError
 PREPARE my_plan(INT) AS SELECT id, age  FROM person WHERE age is $1;
 
+# EXEC/EXECUTE with parentheses but no statement name must error instead of panic
+statement error EXECUTE statement requires a name
+EXEC();
+
+statement error EXECUTE statement requires a name
+EXEC('');
+
+statement error EXECUTE statement requires a name
+EXEC('any-string');
+
+statement error EXECUTE statement requires a name
+EXECUTE();
+
+statement error EXECUTE statement requires a name
+EXEC ('a');
+
 # #######################
 # Test prepare and execute statements