工作目录里有一个事件文件 data/events.parquet，列为 event_id, user_id, ts, event_type, page。
只读出需要的部分：所有购买事件（event_type 恰好等于小写的 purchase）的 event_id, user_id, ts 三列。
Purchase 不算；event_type 为 null 的不算。输出
列为 event_id, user_id, ts，行顺序不限。
data/events.parquet| # | event_idInt64 | user_idInt64 | tsDatetime(time_unit='us', time_zone=None) | event_typeString | pageString |
|---|---|---|---|---|---|
| 1 | 1 | 53 | 2026-06-03 17:57:33 | login | /home |
| 2 | 2 | 53 | 2026-06-04 15:21:00 | visit | /home |
| 3 | 3 | 53 | 2026-06-04 15:22:00 | view | /product/303 |
| 4 | 4 | 53 | 2026-06-04 15:32:04 | add_to_cart | /cart |
| 5 | 5 | 56 | 2026-06-05 23:24:19 | login | /home |
| 6 | 6 | 56 | 2026-06-05 23:29:18 | view | /product/202 |
| 7 | 7 | 56 | 2026-06-05 23:36:15 | view | /product/202 |
| 8 | 8 | 56 | 2026-06-05 23:47:36 | add_to_cart | /cart |
| 9 | 9 | 56 | 2026-06-05 23:56:24 | checkout | /checkout |
| 10 | 10 | 56 | 2026-06-06 19:14:00 | visit | /home |
| 11 | 11 | 56 | 2026-06-06 19:22:53 | view | /product/303 |
| 12 | 12 | 56 | 2026-06-06 19:25:12 | view | /home |
| 13 | 13 | 56 | 2026-06-06 19:28:25 | add_to_cart | /cart |
| 14 | 14 | 29 | 2026-06-07 10:40:01 | login | /home |
| 15 | 15 | 29 | 2026-06-07 10:46:43 | view | /product/303 |
| 16 | 16 | 29 | 2026-06-07 11:04:46 | add_to_cart | /cart |
| 17 | 17 | 29 | 2026-06-07 11:09:25 | checkout | /checkout |
| 18 | 18 | 34 | 2026-06-07 12:57:49 | login | /home |
| 19 | 19 | 34 | 2026-06-07 13:03:57 | view | /product/202 |
| 20 | 20 | 34 | 2026-06-07 13:11:07 | view | /home |
| # | event_idInt64 | user_idInt64 | tsDatetime(time_unit='us', time_zone=None) |
|---|---|---|---|
| 1 | 25 | 34 | 2026-06-08 20:14:11 |
| 2 | 38 | 11 | 2026-06-18 10:31:52 |
| 3 | 49 | 11 | 2026-06-19 13:50:37 |
| 4 | 74 | 29 | 2026-06-23 07:54:17 |
| 5 | 118 | 29 | 2026-07-02 20:15:11 |
| 6 | 122 | 50 | 2026-07-03 18:04:19 |
| 7 | 128 | 59 | 2026-07-05 20:44:27 |
| 8 | 141 | 45 | 2026-07-08 18:43:18 |
| 9 | 145 | 42 | 2026-07-08 23:30:18 |
| 10 | 152 | 35 | 2026-07-09 04:30:54 |
| 11 | 169 | 16 | 2026-07-13 06:00:04 |
| 12 | 210 | 16 | 2026-07-21 21:43:12 |
| 13 | 233 | 28 | 2026-07-23 09:43:30 |
| 14 | 266 | 20 | 2026-07-26 09:43:47 |
| 15 | 300 | 41 | 2026-07-30 11:27:12 |
| 16 | 303 | 26 | 2026-07-30 18:19:41 |
| 17 | 322 | 6 | 2026-08-02 17:42:45 |
| 18 | 327 | 57 | 2026-08-03 07:21:38 |
| 19 | 348 | 41 | 2026-08-07 06:43:01 |
| 20 | 350 | 41 | 2026-08-07 07:04:09 |
| 21 | 373 | 28 | 2026-08-11 07:00:44 |
| 22 | 379 | 28 | 2026-08-11 09:27:28 |
| 23 | 405 | 31 | 2026-08-16 12:13:58 |
| 24 | 427 | 59 | 2026-08-18 20:00:56 |
| 25 | 439 | 45 | 2026-08-21 07:15:05 |
| 26 | 456 | 15 | 2026-08-21 20:43:33 |
| 27 | 480 | 60 | 2026-08-24 05:35:38 |
| 28 | 492 | 8 | 2026-08-24 10:42:26 |
| 29 | 521 | 56 | 2026-08-27 22:56:20 |
| 30 | 558 | 60 | 2026-08-30 09:09:15 |
| 31 | 589 | 32 | 2026-09-03 07:43:37 |
| 32 | 595 | 8 | 2026-09-03 18:49:49 |
| 33 | 608 | 4 | 2026-09-04 08:35:27 |
| 34 | 610 | 17 | 2026-09-04 08:58:40 |
| 35 | 616 | 47 | 2026-09-04 13:52:57 |
| 36 | 643 | 22 | 2026-09-07 05:38:48 |
| 37 | 664 | 29 | 2026-09-08 02:40:56 |
| 38 | 680 | 4 | 2026-09-09 12:01:00 |
| 39 | 689 | 31 | 2026-09-09 20:41:06 |
| 40 | 713 | 23 | 2026-09-11 20:52:42 |
| 41 | 741 | 33 | 2026-09-12 12:36:51 |
| 42 | 747 | 39 | 2026-09-12 15:38:01 |
| 43 | 752 | 39 | 2026-09-12 16:11:24 |
| 44 | 765 | 4 | 2026-09-13 05:35:11 |
| 45 | 826 | 48 | 2026-09-15 11:26:11 |
| 46 | 836 | 11 | 2026-09-16 12:01:00 |
| 47 | 851 | 18 | 2026-09-16 15:02:00 |
| 48 | 858 | 17 | 2026-09-16 19:41:34 |
| 49 | 870 | 21 | 2026-09-17 06:05:03 |
| 50 | 894 | 54 | 2026-09-18 09:20:28 |