sqliteclidriver: better bubble up stderr errors

sqliteclidriver/eventcmd.go

@@ -18,6 +18,22 @@ type processEvent struct {
 	err    error
 }
 
+func (pe processEvent) Error() string {
+	if pe.err != nil {
+		return pe.err.Error()
+	}
+
+	if pe.evtype == evtypeStderr {
+		return string(pe.data)
+	}
+
+	return "<no error>"
+}
+
+func (pe processEvent) Unwrap() error {
+	return pe.err
+}
+
 //
 
 func ExecEvents(cmd *exec.Cmd) (<-chan processEvent, io.WriteCloser, error) {

sqliteclidriver/sqliteclidriver.go

@@ -251,10 +251,11 @@ func (s *SCStmt) Query(args []driver.Value) (driver.Rows, error) {
 						pw.CloseWithError(msg.err)
 						return
 					}
+
 				} else {
 					// Anything else (process event / stderr)
 					// Throw
-					pw.CloseWithError(fmt.Errorf("other thing %#v", msg))
+					pw.CloseWithError(msg)
 					return
 				}