Method clone

packages/sql/src/query/QueryBuilder.ts:2899–2936

(
    reset?: boolean | (keyof QBState<Entity>)[],
    preserve?: (keyof QBState<Entity>)[],
  )

  }

  clone(
    reset?: boolean | (keyof QBState<Entity>)[],
    preserve?: (keyof QBState<Entity>)[],
  ): QueryBuilder<Entity, RootAlias, Hint, Context, RawAliases, Fields, CTEs> {
    const qb = new QueryBuilder<Entity, RootAlias, Hint, Context, RawAliases, Fields, CTEs>(
      this.#state.mainAlias!.entityName,
      this.metadata,
      this.driver,
      this.context,
      this.#state.mainAlias!.aliasName,
      this.connectionType,
      this.em,
    );

    if (reset !== true) {
      qb.#state = Utils.copy(this.#state);
      // CTEs contain NativeQueryBuilder instances that should not be deep-cloned
      qb.#state.ctes = this.#state.ctes.map(cte => ({ ...cte }));

      if (Array.isArray(reset)) {
        const fresh = QueryBuilder.createDefaultState<Entity>();
        for (const key of reset) {
          (qb.#state as any)[key] = (fresh as any)[key];
        }
      }
    } else if (preserve) {
      for (const key of preserve) {
        (qb.#state as any)[key] = Utils.copy((this.#state as any)[key]);
      }
    }

    qb.#state.finalized = false;
    qb.#query = undefined;
    qb.#helper = qb.createQueryBuilderHelper();
    qb.#abortOptions = this.#abortOptions;

    return qb;
  }

  /**
   * Sets logger context for this query builder.