# UnnestFrame 类
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取消嵌套 `DynamicFrame`，将嵌套的对象展平到顶级元素，并为数组对象生成联接键。

## 示例
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我们建议您使用 [`DynamicFrame.unnest()`](aws-glue-api-crawler-pyspark-extensions-dynamic-frame.md#aws-glue-api-crawler-pyspark-extensions-dynamic-frame-unnest) 方法展平 `DynamicFrame` 中的嵌套结构。要查看代码示例，请参阅 [示例：使用 unnest 将嵌套字段转换为顶级字段](aws-glue-api-crawler-pyspark-extensions-dynamic-frame.md#pyspark-unnest-example)。

## 方法
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+ [\$1\$1call\$1\$1](#aws-glue-api-crawler-pyspark-transforms-UnnestFrame-__call__)
+ [apply](#aws-glue-api-crawler-pyspark-transforms-UnnestFrame-apply)
+ [name](#aws-glue-api-crawler-pyspark-transforms-UnnestFrame-name)
+ [describeArgs](#aws-glue-api-crawler-pyspark-transforms-UnnestFrame-describeArgs)
+ [describeReturn](#aws-glue-api-crawler-pyspark-transforms-UnnestFrame-describeReturn)
+ [describeTransform](#aws-glue-api-crawler-pyspark-transforms-UnnestFrame-describeTransform)
+ [describeErrors](#aws-glue-api-crawler-pyspark-transforms-UnnestFrame-describeErrors)
+ [describe](#aws-glue-api-crawler-pyspark-transforms-UnnestFrame-describe)

## \$1\$1call\$1\$1(frame, transformation\$1ctx = "", info="", stageThreshold=0, totalThreshold=0)
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取消嵌套 `DynamicFrame`，将嵌套的对象展平到顶级元素，并为数组对象生成联接键。
+ `frame` – 要取消嵌套的 `DynamicFrame` (必需)。
+ `transformation_ctx` – 用于标识状态信息的唯一字符串 (可选)。
+ `info` – 与转换中的错误关联的字符串 (可选)。
+ `stageThreshold` – 在转换出错之前可能在其中发生的最大错误数（可选）。默认值为 0。
+ `totalThreshold` – 在处理出错之前可能全面发生的最大错误数（可选）。默认值为 0。

## apply(cls, \$1args, \$1\$1kwargs)
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继承自 `GlueTransform` [apply](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-apply)。

## name(cls)
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继承自 `GlueTransform` [名称](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-name)。

## describeArgs(cls)
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继承自 `GlueTransform` [describeArgs](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeArgs)。

## describeReturn(cls)
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继承自 `GlueTransform` [describeReturn](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeReturn)。

## describeTransform(cls)
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继承自 `GlueTransform` [describeTransform](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeTransform)。

## describeErrors(cls)
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继承自 `GlueTransform` [describeErrors](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeErrors)。

## describe(cls)
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继承自 `GlueTransform` [describe](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describe)。