FlatMap kelas

Menerapkan transformasi ke masing-masing DynamicFrame dalam koleksi. Hasil tidak diratakan menjadi satuDynamicFrame, tetapi dipertahankan sebagai koleksi.

Contoh untuk FlatMap

Contoh cuplikan berikut menunjukkan bagaimana menggunakan ResolveChoice transformasi pada koleksi frame dinamis ketika diterapkan ke file. FlatMap Data yang digunakan untuk input ada di JSON yang terletak di alamat Amazon S3 placeholder s3://bucket/path-for-data/sample.json dan berisi data berikut.

Contoh data JSON

[{
    "firstname": "Arnav",
    "lastname": "Desai",
    "address": {
        "street": "6 Anyroad Avenue",
        "city": "London",
        "state": "England",
        "country": "UK"
    },
    "phone": 17235550101,
    "affiliations": [
        "General Anonymous Example Products",
        "Example Independent Research",
        "Government Department of Examples"
    ]
},
{
    "firstname": "Mary",
    "lastname": "Major",
    "address": {
        "street": "7821 Spot Place",
        "city": "Centerville",
        "state": "OK",
        "country": "US"
    },
    "phone": 19185550023,
    "affiliations": [
        "Example Dot Com",
        "Example Independent Research",
        "Example.io"
    ]
},
{
    "firstname": "Paulo",
    "lastname": "Santos",
    "address": {
        "street": "123 Maple Street",
        "city": "London",
        "state": "Ontario",
        "country": "CA"
    },
    "phone": 12175550181,
    "affiliations": [
        "General Anonymous Example Products",
        "Example Dot Com"
    ]
}]

contoh Terapkan ResolveChoice ke DynamicFrameCollection dan tampilkan output.

#Read DynamicFrame
datasource = glueContext.create_dynamic_frame_from_options("s3", connection_options = {"paths":["s3://bucket/path/to/file/mysamplejson.json"]}, format="json")
datasource.printSchema()
datasource.show()

## Split to create a DynamicFrameCollection
split_frame=datasource.split_fields(["firstname","lastname","address"],"personal_info","business_info")
split_frame.keys()
print("---")

## Use FlatMap to run ResolveChoice
kwargs = {"choice": "cast:string"}
flat = FlatMap.apply(split_frame, ResolveChoice, frame_name="frame", transformation_ctx='tcx', **kwargs)
flat.keys()

##Select one of the DynamicFrames
personal_info = flat.select("personal_info")
personal_info.printSchema()
personal_info.show()
print("---")

business_info = flat.select("business_info")
business_info.printSchema()
business_info.show()

penting

Saat meneleponFlatMap.apply, frame_name parameternya harus"frame". Tidak ada nilai lain yang diterima saat ini.

Contoh keluaran

root
|-- firstname: string
|-- lastname: string
|-- address: struct
|    |-- street: string
|    |-- city: string
|    |-- state: string
|    |-- country: string
|-- phone: long
|-- affiliations: array
|    |-- element: string
---
{
    "firstname": "Mary",
    "lastname": "Major",
    "address": {
        "street": "7821 Spot Place",
        "city": "Centerville",
        "state": "OK",
        "country": "US"
    },
    "phone": 19185550023,
    "affiliations": [
        "Example Dot Com",
        "Example Independent Research",
        "Example.io"
    ]
}

{
    "firstname": "Paulo",
    "lastname": "Santos",
    "address": {
        "street": "123 Maple Street",
        "city": "London",
        "state": "Ontario",
        "country": "CA"
    },
    "phone": 12175550181,
    "affiliations": [
        "General Anonymous Example Products",
        "Example Dot Com"
    ]
}
---
root
|-- firstname: string
|-- lastname: string
|-- address: struct
|    |-- street: string
|    |-- city: string
|    |-- state: string
|    |-- country: string

{
    "firstname": "Mary",
    "lastname": "Major",
    "address": {
        "street": "7821 Spot Place",
        "city": "Centerville",
        "state": "OK",
        "country": "US"
    }
}

{
    "firstname": "Paulo",
    "lastname": "Santos",
    "address": {
        "street": "123 Maple Street",
        "city": "London",
        "state": "Ontario",
        "country": "CA"
    }
}
---
root
|-- phone: long
|-- affiliations: array
|    |-- element: string

{
    "phone": 19185550023,
    "affiliations": [
        "Example Dot Com",
        "Example Independent Research",
        "Example.io"
    ]
}

{
    "phone": 12175550181,
    "affiliations": [
        "General Anonymous Example Products",
        "Example Dot Com"
    ]
}

Metode

• __call__

• Terapkan

• Nama

• describeArgs

• describeReturn

• describeTransform

• describeErrors

• Jelaskan

__call__ (dfc,, frame_name BaseTransform, transformation_ctx = “”, **base_kwargs)

Menerapkan sebuah transformasi untuk setiap DynamicFrame dalam sebuah koleksi dan meratakan hasilnya.

• dfc — DynamicFrameCollection tempat untuk melakukan flatmap (wajib).

• BaseTransform — Sebuah transformasi yang berasal dari GlueTransform untuk diterapkan ke setiap anggota koleksi (wajib).

• frame_name — Nama argumen yang padanya elemen koleksi akan diberikan (wajib).

• transformation_ctx — Sebuah string unik yang digunakan untuk mengidentifikasi informasi status (opsional).

• base_kwargs — Argumen yang akan diberikan ke transformasi dasar (wajib).

Mengembalikan sebuah DynamicFrameCollection baru yang dibuat dengan menerapkan transformasi untuk setiap DynamicFrame dalam DynamicFrameCollection sumber.

apply(cls, *args, **kwargs)

Warisan dari GlueTransform apply.

name(cls)

Warisan dari GlueTransform nama.

describeArgs(cls)

Warisan dari GlueTransform describeArgs.

describeReturn(cls)

Warisan dari GlueTransform describeReturn.

describeTransform(cls)

Warisan dari GlueTransform describeTransform.

describeErrors(cls)

Warisan dari GlueTransform describeErrors.

describe(cls)

Warisan dari GlueTransform describe.