io.delta.kernel.types

Class StructType

java.lang.Object

io.delta.kernel.types.DataType

io.delta.kernel.types.StructType

public final class StructType
extends DataType

Struct type which contains one or more columns.

Constructor Summary

Constructors

Constructor and Description
StructType()
StructType(java.util.List<StructField> fields)

Method Summary

Modifier and Type	Method and Description
StructType	add(java.lang.String name, DataType dataType)
StructType	add(java.lang.String name, DataType dataType, boolean nullable)
StructType	add(java.lang.String name, DataType dataType, java.util.Map<java.lang.String,java.lang.String> metadata)
StructType	add(StructField field)
StructField	at(int index)
Column	column(int ordinal) Creates a Column expression for the field at the given ordinal
Column	column(java.lang.String fieldName) Creates a Column expression for the field with the given fieldName.
boolean	equals(java.lang.Object o)
boolean	equivalent(DataType dataType) Are the data types same? The metadata or column names could be different.
java.util.List<java.lang.String>	fieldNames()
java.util.List<StructField>	fields()
StructField	get(java.lang.String fieldName)
int	hashCode()
int	indexOf(java.lang.String fieldName)
int	length()
java.lang.String	toJson() Convert the data type to Delta protocol specified serialization format.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

StructType

public StructType()

StructType

public StructType(java.util.List<StructField> fields)

Method Detail

add

public StructType add(StructField field)

add

public StructType add(java.lang.String name,
                      DataType dataType)

add

public StructType add(java.lang.String name,
                      DataType dataType,
                      boolean nullable)

add

public StructType add(java.lang.String name,
                      DataType dataType,
                      java.util.Map<java.lang.String,java.lang.String> metadata)

fields

public java.util.List<StructField> fields()

Returns:

array of fields

fieldNames

public java.util.List<java.lang.String> fieldNames()

Returns:

array of field names

length

public int length()

Returns:

the number of fields

indexOf

public int indexOf(java.lang.String fieldName)

get

public StructField get(java.lang.String fieldName)

at

public StructField at(int index)

column

public Column column(int ordinal)

Creates a Column expression for the field at the given ordinal

Parameters:

ordinal - the ordinal of the StructField to create a column for

Returns:

a Column expression for the StructField with ordinal ordinal

column

public Column column(java.lang.String fieldName)

Creates a Column expression for the field with the given fieldName.

Parameters:

fieldName - the name of the StructField to create a column for

Returns:

a Column expression for the StructField with name fieldName

equivalent

public boolean equivalent(DataType dataType)

Description copied from class: DataType

Are the data types same? The metadata or column names could be different.

Overrides:

equivalent in class DataType

Returns:

toString

public java.lang.String toString()

Specified by:

toString in class DataType

toJson

public java.lang.String toJson()

Description copied from class: DataType

Convert the data type to Delta protocol specified serialization format.

Specified by:

toJson in class DataType

Returns:

Data type serialized in JSON format.

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in class DataType

hashCode

public int hashCode()

Specified by:

hashCode in class DataType