更新索引为杜松子酒索引

Question

在我的rails应用程序中，我的表带有如下所示的索引：

  create_table "people", force: :cascade do |t|
    t.datetime "created_at",  null: false
    t.datetime "updated_at",  null: false
    t.string   "first_name",  limit: 255
    t.string   "last_name",   limit: 255
    t.string   "middle_name", limit: 255

    t.index name: "people_lowercase_full_names_gist_ops_idx", using: :gist, expression: "lower((((COALESCE(first_name, ''::character varying))::text || (COALESCE(middle_name, ''::character varying))::text) || (COALESCE(last_name, ''::character varying))::text))"
    t.index name: "people_lowercase_full_names_text_pattern_ops_idx", expression: "lower((((COALESCE(first_name, ''::character varying))::text || (COALESCE(middle_name, ''::character varying))::text) || (COALESCE(last_name, ''::character varying))::text))"
  end

如何将那些索引更新为杜松子酒索引？

Answer 1

您不能更改索引类型。 更改索引类型只能通过放置/创建来完成。 它需要完全重建。 实际上这将永远不可能。