SelectFromCollection class - Amazon Glue
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SelectFromCollection class

Selects one DynamicFrame in a DynamicFrameCollection.

Example

This example uses SelectFromCollection to select a DynamicFrame from a DynamicFrameCollection.

Example dataset

The example selects two DynamicFrames from a DynamicFrameCollection called split_rows_collection. The following is the list of keys in split_rows_collection.

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

Example code

# 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

Methods

__call__(dfc, key, transformation_ctx = "")

Gets one DynamicFrame from a DynamicFrameCollection.

  • dfc – The DynamicFrameCollection that the DynamicFrame should be selected from (required).

  • key – The key of the DynamicFrame to select (required).

  • transformation_ctx – A unique string that is used to identify state information (optional).

apply(cls, *args, **kwargs)

Inherited from GlueTransform Apply.

name(cls)

Inherited from GlueTransform Name.

describeArgs(cls)

Inherited from GlueTransform describeArgs.

describeReturn(cls)

Inherited from GlueTransform describeReturn.

describeTransform(cls)

Inherited from GlueTransform describeTransform.

describeErrors(cls)

Inherited from GlueTransform describeErrors.

describe(cls)

Inherited from GlueTransform Describe.