DataFrameReader.Schema Method

Definition

Namespace:

Microsoft.Spark.Sql

Assembly:

Microsoft.Spark.dll

Package:

Microsoft.Spark v1.0.0

Overloads

Schema(StructType)	Specifies the schema by using StructType.
Schema(String)	Specifies the schema by using the given DDL-formatted string.

Schema(StructType)

Specifies the schema by using StructType.

public Microsoft.Spark.Sql.DataFrameReader Schema (Microsoft.Spark.Sql.Types.StructType schema);

member this.Schema : Microsoft.Spark.Sql.Types.StructType -> Microsoft.Spark.Sql.DataFrameReader

Public Function Schema (schema As StructType) As DataFrameReader

Parameters

schema

StructType

The input schema

Returns

DataFrameReader

This DataFrameReader object

Remarks

Some data sources (e.g. JSON) can infer the input schema automatically from data. By specifying the schema here, the underlying data source can skip the schema inference step, and thus speed up data loading.

Schema(String)

Specifies the schema by using the given DDL-formatted string.

public Microsoft.Spark.Sql.DataFrameReader Schema (string schemaString);

member this.Schema : string -> Microsoft.Spark.Sql.DataFrameReader

Public Function Schema (schemaString As String) As DataFrameReader

Parameters

schemaString

String

DDL-formatted string

Returns

DataFrameReader

This DataFrameReader object

Remarks

Some data sources (e.g. JSON) can infer the input schema automatically from data. By specifying the schema here, the underlying data source can skip the schema inference step, and thus speed up data loading.