session: add parser failed error to sessionVars.StmtCtx (#34311)

close pingcap/tidb#34276

executor/show_test.go

@@ -141,6 +141,11 @@ func TestShowErrors(t *testing.T) {
 	_, _ = tk.Exec(testSQL)
 
 	tk.MustQuery("show errors").Check(testkit.RowsWithSep("|", "Error|1050|Table 'test.show_errors' already exists"))
+
+	// eliminate previous errors
+	tk.MustExec("select 1")
+	_, _ = tk.Exec("create invalid")
+	tk.MustQuery("show errors").Check(testkit.RowsWithSep("|", "Error|1064|You have an error in your SQL syntax; check the manual that corresponds to your TiDB version for the right syntax to use line 1 column 14 near \"invalid\" "))
 }
 
 func TestShowWarningsForExprPushdown(t *testing.T) {

server/server_test.go

@@ -2057,9 +2057,10 @@ func (cli *testServerClient) runTestInfoschemaClientErrors(t *testing.T) {
 				errCode:           1068, // multiple pkeys
 			},
 			{
-				stmt:            "gibberish",
-				incrementErrors: true,
-				errCode:         1064, // parse error
+				stmt:              "gibberish",
+				incrementWarnings: true,
+				incrementErrors:   true,
+				errCode:           1064, // parse error
 			},
 		}
 

session/session.go

@@ -1503,6 +1503,7 @@ func (s *session) Parse(ctx context.Context, sql string) ([]ast.StmtNode, error)
 	stmts, warns, err := s.ParseSQL(ctx, sql, s.sessionVars.GetParseParams()...)
 	if err != nil {
 		s.rollbackOnError(ctx)
+		err = util.SyntaxError(err)
 
 		// Only print log message when this SQL is from the user.
 		// Mute the warning for internal SQLs.
@@ -1512,8 +1513,9 @@ func (s *session) Parse(ctx context.Context, sql string) ([]ast.StmtNode, error)
 			} else {
 				logutil.Logger(ctx).Warn("parse SQL failed", zap.Error(err), zap.String("SQL", sql))
 			}
+			s.sessionVars.StmtCtx.AppendError(err)
 		}
-		return nil, util.SyntaxError(err)
+		return nil, err
 	}
 
 	durParse := time.Since(parseStartTime)