Quantile serias scalar function #2055
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zhiqiang-hhhh
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morrySnow
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Feb 21, 2025
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| ## Description | ||
| The `QUANTILE_PERCENT` function is used to calculate the quantile value for a given percentage. It takes two parameters: a quantile_state column and a constant floating-point number representing the percentage. The function returns a floating-point number that represents the quantile value at the given percentage position. |
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| ``` | ||
| QUANTILE_PERCENT(<quantile_state>, <percent>) | ||
| ``` |
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Suggested change
| ``` | |
| QUANTILE_PERCENT(<quantile_state>, <percent>) | |
| ``` | |
| ```sql | |
| QUANTILE_PERCENT(<quantile_state>, <percent>) | |
| ``` |
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| SELECT dt, id, quantile_percent(quantile_union(price), 0) FROM quantile_state_agg_test GROUP BY dt, id ORDER BY dt, id | ||
| -------------- | ||
|
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| +----------+------+--------------------------------------------+ | ||
| | dt | id | quantile_percent(quantile_union(price), 0) | | ||
| +----------+------+--------------------------------------------+ | ||
| | 20220201 | 0 | 1 | | ||
| | 20220201 | 1 | -1 | | ||
| +----------+------+--------------------------------------------+ | ||
| 2 rows in set (0.42 sec) | ||
| ``` |
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Suggested change
| SELECT dt, id, quantile_percent(quantile_union(price), 0) FROM quantile_state_agg_test GROUP BY dt, id ORDER BY dt, id | |
| -------------- | |
| +----------+------+--------------------------------------------+ | |
| | dt | id | quantile_percent(quantile_union(price), 0) | | |
| +----------+------+--------------------------------------------+ | |
| | 20220201 | 0 | 1 | | |
| | 20220201 | 1 | -1 | | |
| +----------+------+--------------------------------------------+ | |
| 2 rows in set (0.42 sec) | |
| ``` | |
| SELECT dt, id, quantile_percent(quantile_union(price), 0) FROM quantile_state_agg_test GROUP BY dt, id ORDER BY dt, id | |
| ``` | |
| ```text | |
| +----------+------+--------------------------------------------+ | |
| | dt | id | quantile_percent(quantile_union(price), 0) | | |
| +----------+------+--------------------------------------------+ | |
| | 20220201 | 0 | 1 | | |
| | 20220201 | 1 | -1 | | |
| +----------+------+--------------------------------------------+ | |
| ``` |
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| ```sql | ||
| -------------- | ||
| select quantile_percent(quantile_union(quantile_state_empty()), 0) | ||
| -------------- | ||
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| +-------------------------------------------------------------+ | ||
| | quantile_percent(quantile_union(quantile_state_empty()), 0) | | ||
| +-------------------------------------------------------------+ | ||
| | NULL | | ||
| +-------------------------------------------------------------+ | ||
| 1 row in set (0.12 sec) | ||
| ``` |
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按照 quantile-percent 评论中的统一改一下 example 格式
- 查询和结果要分开
- 结果用 text 格式
- 不要最后一行
x rows...
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