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Merging a dask dataframe with a pandas series fails

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还没有人认领这个 Issue。

评估

难度
3/5
预计耗时
1-2 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
pandas, python
领域
data

调研方向

Reproduce df.merge(df.name.head()) from the issue, then inspect the merge entry point in dask_expr/_collection.py around line 4783. Done means merging the Dask dataframe with the pandas Series no longer raises AttributeError and produces behavior consistent with the shown pandas result.

由索引模型根据 Issue 内容生成。

描述

In [1]: import dask

In [2]: import dask_expr as dd
   ...: df = dd.datasets.timeseries()

In [3]: df.head()
Out[3]:
                        name    id         x         y
timestamp
2000-01-01 00:00:00  Michael  1006  0.927520 -0.442859
2000-01-01 00:00:01    Kevin  1018 -0.411144 -0.037667
2000-01-01 00:00:02   Yvonne   974 -0.648850 -0.515754
2000-01-01 00:00:03   Yvonne   994  0.463103  0.560937
2000-01-01 00:00:04   Yvonne  1002 -0.511311 -0.308211

In [4]: df.merge(df.name.head())

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-254398e6f615> in ?()
----> 1 df.merge(df.name.head())

~/workspace/dask-expr/dask_expr/_collection.py in ?(self, right, how, on, left_on, right_on, left_index, right_index, suffixes, indicator, shuffle_method, npartitions, broadcast)
   2572         an internal ``shuffle``, because shuffling places all rows that have the same
   2573         index in the same partition. To avoid this error, make sure all rows with the
   2574         same ``on``-column value can fit on a single partition.
   2575         """
-> 2576         return merge(
   2577             self,
   2578             right,
   2579             how,

~/workspace/dask-expr/dask_expr/_collection.py in ?(left, right, how, on, left_on, right_on, left_index, right_index, suffixes, indicator, shuffle_method, npartitions, broadcast)
   4779     for o in [on, left_on, right_on]:
   4780         if isinstance(o, FrameBase):
   4781             raise NotImplementedError()
   4782     if not on and not left_on and not right_on and not left_index and not right_index:
-> 4783         on = [c for c in left.columns if c in right.columns]
   4784         if not on:
   4785             left_index = right_index = True
   4786

~/workspace/dask-expr/dask_expr/_collection.py in ?(.0)
-> 4783 def merge(
   4784     left,
   4785     right,
   4786     how="inner",

~/mambaforge/envs/etl-tpch/lib/python3.11/site-packages/pandas/core/generic.py in ?(self, name)
   6289             and name not in self._accessors
   6290             and self._info_axis._can_hold_identifiers_and_holds_name(name)
   6291         ):
   6292             return self[name]
-> 6293         return object.__getattribute__(self, name)

AttributeError: 'Series' object has no attribute 'columns'

In [5]: df.head().merge(df.name.head())
Out[5]:
       name    id         x         y
0   Michael  1006  0.927520 -0.442859
1     Kevin  1018 -0.411144 -0.037667
2    Yvonne   974 -0.648850 -0.515754
3    Yvonne   974 -0.648850 -0.515754
4    Yvonne   974 -0.648850 -0.515754
5    Yvonne   994  0.463103  0.560937
6    Yvonne   994  0.463103  0.560937
7    Yvonne   994  0.463103  0.560937
8    Yvonne  1002 -0.511311 -0.308211
9    Yvonne  1002 -0.511311 -0.308211
10   Yvonne  1002 -0.511311 -0.308211
主要语言
Python
星标
89
派生
26
30 天内没有已合并 PR

环境准备

  • 没有 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 阅读贡献指南

从这里开始

  1. 先读完整个 Issue，再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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