Improve replication plan builder errors

Signed-off-by: Matt Lord <[email protected]>

go/vt/vttablet/tabletmanager/vreplication/replicator_plan.go

@@ -88,7 +88,7 @@ func (rp *ReplicatorPlan) buildExecutionPlan(fieldEvent *binlogdatapb.FieldEvent
 	// select * construct was used. We need to use the field names.
 	tplan, err := rp.buildFromFields(prelim.TargetName, prelim.Lastpk, fieldEvent.Fields)
 	if err != nil {
-		return nil, err
+		return nil, vterrors.Wrapf(err, "failed to build replication plan for %s table", fieldEvent.TableName)
 	}
 	tplan.Fields = fieldEvent.Fields
 	return tplan, nil