‘DataFrame’ 对象没有 ‘merge’ 属性

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英文:

'DataFrame' object has no attribute 'merge'

问题

我是新手使用 PySpark,尝试使用 merge 函数将一个数据框合并到 Delta 位置中的一个数据框。

DEV_Delta.alias("t").merge(df_from_pbl.alias("s"), condition_dev)\
  .whenMatchedUpdateAll() \
  .whenNotMatchedInsertAll()\
  .execute()

这两个数据框具有相同数量的列,但当我在笔记本中运行这个特定命令时,我收到以下错误消息:'DataFrame' object has no attribute 'merge'

我找不到关于这个特定任务的解决方案,因此提出一个新问题。你能帮我找出这个问题吗?

谢谢,
Afras Khan

英文:

I am new to PySpark and i am trying to merge a dataframe to the one present in Delta location using the merge function.

DEV_Delta.alias("t").merge(df_from_pbl.alias("s"),condition_dev)\
  .whenMatchedUpdateAll() \
  .whenNotMatchedInsertAll()\
  .execute()

Both the dataframes have equal number of columns but when i run this particular command in my notebook i get the following error
'DataFrame' object has no attribute 'merge'

I couldnt find solutions for this particular task and hence raising a new question. Could you please help me figuring out this issue?

Thanks,
Afras Khan

答案1

得分: 0

你需要拥有 DeltaTable 类的一个实例,但你却传递了 DataFrame。为此,你需要使用 DeltaTable.forPath(指向特定路径)或 DeltaTable.forName(用于命名表)来创建它,就像这样:

DEV_Delta = DeltaTable.forPath(spark, '某个路径')
DEV_Delta.alias("t").merge(df_from_pbl.alias("s"), condition_dev)\
  .whenMatchedUpdateAll() \
  .whenNotMatchedInsertAll()\
  .execute()

如果你只有一个 DataFrame 作为数据,你需要先将它们写入。

更多详细信息请参阅文档

英文:

You need to have an instance of the DeltaTable class, but you're passing the DataFrame instead. For this you need to create it using the DeltaTable.forPath (pointing to a specific path) or DeltaTable.forName (for a named table), like this:

DEV_Delta = DeltaTable.forPath(spark, 'some path')
DEV_Delta.alias("t").merge(df_from_pbl.alias("s"),condition_dev)\
  .whenMatchedUpdateAll() \
  .whenNotMatchedInsertAll()\
  .execute()

If you have data as DataFrame only, you need to write them first.

See documentation for more details.

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  • 本文由 发表于 2023年2月18日 20:16:15
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