本文整理匯總了Golang中github.com/cockroachdb/cockroach/pkg/sql/sqlbase.TableDescriptor.Mutations方法的典型用法代碼示例。如果您正苦於以下問題：Golang TableDescriptor.Mutations方法的具體用法？Golang TableDescriptor.Mutations怎麽用？Golang TableDescriptor.Mutations使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類github.com/cockroachdb/cockroach/pkg/sql/sqlbase.TableDescriptor的用法示例。
在下文中一共展示了TableDescriptor.Mutations方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: deleteIndexMutationsWithReversedColumns
// 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
}