Class Select.Flattened<T>
- java.lang.Object
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- org.apache.beam.sdk.transforms.PTransform<PCollection<T>,PCollection<Row>>
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- org.apache.beam.sdk.schemas.transforms.Select.Flattened<T>
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- All Implemented Interfaces:
java.io.Serializable
,HasDisplayData
- Enclosing class:
- Select
public abstract static class Select.Flattened<T> extends PTransform<PCollection<T>,PCollection<Row>>
APTransform
representing a flattened schema.- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.apache.beam.sdk.transforms.PTransform
name, resourceHints
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Constructor Summary
Constructors Constructor Description Flattened()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Select.Flattened<T>
concatFieldNames()
For nested fields, concatenate all the names separated by a _ character in the flattened schema.PCollection<Row>
expand(PCollection<T> input)
Override this method to specify how thisPTransform
should be expanded on the givenInputT
.Select.Flattened<T>
keepMostNestedFieldName()
For nested fields, keep just the most-nested field name.Select.Flattened<T>
withFieldNameAs(java.lang.String fieldName, java.lang.String fieldRename)
Allows renaming a specific nested field.Select.Flattened<T>
withOutputSchema(Schema schema)
Rename all output fields to match the specified schema.-
Methods inherited from class org.apache.beam.sdk.transforms.PTransform
compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate, validate
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Method Detail
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concatFieldNames
public Select.Flattened<T> concatFieldNames()
For nested fields, concatenate all the names separated by a _ character in the flattened schema.
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keepMostNestedFieldName
public Select.Flattened<T> keepMostNestedFieldName()
For nested fields, keep just the most-nested field name. Will fail if this name is not unique.
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withFieldNameAs
public Select.Flattened<T> withFieldNameAs(java.lang.String fieldName, java.lang.String fieldRename)
Allows renaming a specific nested field. Can be used if two fields resolve to the same name with the default name policies.
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withOutputSchema
public Select.Flattened<T> withOutputSchema(Schema schema)
Rename all output fields to match the specified schema. If the specified schema is not compatible with the output schema a failure will be raised.
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expand
public PCollection<Row> expand(PCollection<T> input)
Description copied from class:PTransform
Override this method to specify how thisPTransform
should be expanded on the givenInputT
.NOTE: This method should not be called directly. Instead apply the
PTransform
should be applied to theInputT
using theapply
method.Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).
- Specified by:
expand
in classPTransform<PCollection<T>,PCollection<Row>>
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