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Apache spark Spark中定义的col和window方法在哪里？_Apache Spark - Fatal编程技术网
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Apache spark Spark中定义的col和window方法在哪里？

apache-spark

Apache spark Spark中定义的col和window方法在哪里？,apache-spark,Apache Spark,我找到了这个结构 purchaseByCustomerPerHour = streamingDataFrame\ .selectExpr( "CustomerId", "(UnitPrice * Quantity) as total_cost", "InvoiceDate")\ .groupBy( col("CustomerId"), window(col("InvoiceDate"), "1 day"))\ .sum("total_cost") col和window方法在哪里定义？我在Spa

我找到了这个结构

purchaseByCustomerPerHour = streamingDataFrame\
.selectExpr(
"CustomerId",
"(UnitPrice * Quantity) as total_cost",
"InvoiceDate")\
.groupBy(
col("CustomerId"), window(col("InvoiceDate"), "1 day"))\
.sum("total_cost")
col和window方法在哪里定义？我在Spark的API文档中找不到它们。

找到了。在$

我应该注意到在同一代码中使用了import关键字