feat(frontend): support SET SESSION CHARACTERISTICS AS TRANSACTION (risingwavelabs#8497)

Author: wenym1

src/frontend/src/handler/mod.rs

@@ -18,7 +18,9 @@ use std::task::{Context, Poll};
 
 use futures::stream::{self, BoxStream};
 use futures::{Stream, StreamExt};
-use pgwire::pg_response::StatementType::{ABORT, BEGIN, COMMIT, ROLLBACK, START_TRANSACTION};
+use pgwire::pg_response::StatementType::{
+    ABORT, BEGIN, COMMIT, ROLLBACK, SET_TRANSACTION, START_TRANSACTION,
+};
 use pgwire::pg_response::{PgResponse, RowSetResult};
 use pgwire::pg_server::BoxedError;
 use pgwire::types::{Format, Row};
@@ -410,6 +412,10 @@ pub async fn handle(
             ROLLBACK,
             "Ignored temporarily. See detail in issue#2541".to_string(),
         )),
+        Statement::SetTransaction { .. } => Ok(PgResponse::empty_result_with_notice(
+            SET_TRANSACTION,
+            "Ignored temporarily. See detail in issue#2541".to_string(),
+        )),
         _ => Err(
             ErrorCode::NotImplemented(format!("Unhandled statement: {}", stmt), None.into()).into(),
         ),

src/utils/pgwire/src/pg_response.rs

@@ -82,6 +82,7 @@ pub enum StatementType {
     BEGIN,
     COMMIT,
     ROLLBACK,
+    SET_TRANSACTION,
 }
 
 impl std::fmt::Display for StatementType {