4paradigm / 4paradigm/OpenMLDB
can't lift child `i` to list for udf functions which requires params as list
- 主要言語
- C++
- スター
- 1.7k
- フォーク
- 331
- 平均マージ
- 12日 12時間
- マージ済み PR(30日)
- 1
説明
some udf function requires list param, e.g `lag`, `first_value`, `join`, while some exprs can't infer to list, e.g `case when` expr.
A yaml case:
```yaml
- id: 22
inputs:
- name: t1
columns: ["id string", "gp int", "ts int64", "val int"]
indexs: ["index1:gp:ts"]
rows:
- ["0", 1, 5, 66]
- ["1", 1, 6, 67]
sql: |
select id,
lag(case when ts < 10 then ts else null end, 1) over w as agg
from t1
WINDOW w AS (PARTITION BY gp ORDER BY ts ROWS_RANGE BETWEEN 60d PRECEDING AND CURRENT ROW MAXSIZE 101)
expect:
success: true
```
コントリビューションガイド
調査の方向性
The issue involves UDF functions like `lag` that require list parameters, but certain expressions like `case when` cannot be inferred to a list. Examine the SQL engine's type inference logic, particularly around window functions and expression evaluation. Look at the test case in YAML to understand the failing scenario. Check the code handling UDF parameter lifting and expression type resolution.
索引モデルが issue の本文から書いたものです。
評価
- 技術スタック
- sql
- 領域
- databases, machine-learning
- issue の種類
- バグ
- 難易度
- 4/5
- 見積もり時間
- 3〜5日
- 活発さ
- 停滞
- 明瞭さ
- おおむね明確
- 初心者へのやさしさ
- 35/100