Method select

packages/db/src/clickhouse/query-builder.ts:85–103

(
    columns: (string | Expression | null | undefined | false)[],
    type: 'merge' | 'replace' = 'replace'
  )

  // Select methods
  select<U>(
    columns: (string | Expression | null | undefined | false)[],
    type: 'merge' | 'replace' = 'replace'
  ): Query<U> {
    if (this._skipNext) {
      return this as unknown as Query<U>;
    }
    if (type === 'merge') {
      this._select = [
        ...this._select,
        ...columns.filter((col): col is string | Expression => Boolean(col)),
      ];
    } else {
      this._select = columns.filter((col): col is string | Expression =>
        Boolean(col)
      );
    }
    return this as unknown as Query<U>;
  }

  except(columns: string[]): this {
    this._except = [...this._except, ...columns];