// deleteIndexMutationsWithReversedColumns deletes index mutations with a
// different mutationID than the schema changer and a reference to one of the
// reversed columns.
func (sc *SchemaChanger) deleteIndexMutationsWithReversedColumns(
desc *sqlbase.TableDescriptor, columns map[string]struct{},
) {
newMutations := make([]sqlbase.DescriptorMutation, 0, len(desc.Mutations))
for _, mutation := range desc.Mutations {
if mutation.MutationID != sc.mutationID {
if idx := mutation.GetIndex(); idx != nil {
deleteMutation := false
for _, name := range idx.ColumnNames {
if _, ok := columns[name]; ok {
// Such an index mutation has to be with direction ADD and
// in the DELETE_ONLY state. Live indexes referencing live
// columns cannot be deleted and thus never have direction
// DROP. All mutations with the ADD direction start off in
// the DELETE_ONLY state.
if mutation.Direction != sqlbase.DescriptorMutation_ADD ||
mutation.State != sqlbase.DescriptorMutation_DELETE_ONLY {
panic(fmt.Sprintf("mutation in bad state: %+v", mutation))
}
log.Warningf(context.TODO(), "delete schema change mutation: %+v", mutation)
deleteMutation = true
break
}
}
if deleteMutation {
continue
}
}
}
newMutations = append(newMutations, mutation)
}
// Reset mutations.
desc.Mutations = newMutations
}
