SelectFromCollection 類別 - AWS Glue

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SelectFromCollection 類別

DynamicFrameCollection 中選擇一個 DynamicFrame

範例

此範例使用 SelectFromCollectionDynamicFrameCollection 中選取 DynamicFrame

範例資料集

該範例從稱為 split_rows_collectionDynamicFrameCollection 中選取兩個 DynamicFrames。以下是 split_rows_collection 中的索引鍵清單。

dict_keys(['high', 'low'])

範例程式碼

# Example: Use SelectFromCollection to select # DynamicFrames from a DynamicFrameCollection from pyspark.context import SparkContext from awsglue.context import GlueContext from awsglue.transforms import SelectFromCollection # Create GlueContext sc = SparkContext.getOrCreate() glueContext = GlueContext(sc) # Select frames and inspect entries frame_low = SelectFromCollection.apply(dfc=split_rows_collection, key="low") frame_low.toDF().show() frame_high = SelectFromCollection.apply(dfc=split_rows_collection, key="high") frame_high.toDF().show()
+---+-----+------------------------+-------------------------+ | id|index|contact_details.val.type|contact_details.val.value| +---+-----+------------------------+-------------------------+ | 1| 0| fax| 202-225-3307| | 1| 1| phone| 202-225-5731| | 2| 0| fax| 202-225-3307| | 2| 1| phone| 202-225-5731| | 3| 0| fax| 202-225-3307| | 3| 1| phone| 202-225-5731| | 4| 0| fax| 202-225-3307| | 4| 1| phone| 202-225-5731| | 5| 0| fax| 202-225-3307| | 5| 1| phone| 202-225-5731| | 6| 0| fax| 202-225-3307| | 6| 1| phone| 202-225-5731| | 7| 0| fax| 202-225-3307| | 7| 1| phone| 202-225-5731| | 8| 0| fax| 202-225-3307| | 8| 1| phone| 202-225-5731| | 9| 0| fax| 202-225-3307| | 9| 1| phone| 202-225-5731| | 10| 0| fax| 202-225-6328| | 10| 1| phone| 202-225-4576| +---+-----+------------------------+-------------------------+ only showing top 20 rows +---+-----+------------------------+-------------------------+ | id|index|contact_details.val.type|contact_details.val.value| +---+-----+------------------------+-------------------------+ | 11| 0| fax| 202-225-6328| | 11| 1| phone| 202-225-4576| | 11| 2| twitter| RepTrentFranks| | 12| 0| fax| 202-225-6328| | 12| 1| phone| 202-225-4576| | 12| 2| twitter| RepTrentFranks| | 13| 0| fax| 202-225-6328| | 13| 1| phone| 202-225-4576| | 13| 2| twitter| RepTrentFranks| | 14| 0| fax| 202-225-6328| | 14| 1| phone| 202-225-4576| | 14| 2| twitter| RepTrentFranks| | 15| 0| fax| 202-225-6328| | 15| 1| phone| 202-225-4576| | 15| 2| twitter| RepTrentFranks| | 16| 0| fax| 202-225-6328| | 16| 1| phone| 202-225-4576| | 16| 2| twitter| RepTrentFranks| | 17| 0| fax| 202-225-6328| | 17| 1| phone| 202-225-4576| +---+-----+------------------------+-------------------------+ only showing top 20 rows

方法

__call__(dfc, key, transformation_ctx = "")

DynamicFrameCollection 取得一個 DynamicFrame

  • dfc – 應該從其中選取 DynamicFrameDynamicFrameCollection (必要)。

  • key – 所要選擇的 DynamicFrame 金鑰 (必要)。

  • transformation_ctx – 用於識別狀態資訊的唯一字串 (選用)。

apply(cls, *args, **kwargs)

繼承自 GlueTransform apply

name(cls)

繼承自 GlueTransform name

describeArgs(cls)

繼承自 GlueTransform describeArgs

describeReturn(cls)

繼承自 GlueTransform describeReturn

describeTransform(cls)

繼承自 GlueTransform describeTransform

describeErrors(cls)

繼承自 GlueTransform describeErrors

describe(cls)

繼承自 GlueTransform describe