io.delta.standalone.expressions

Class Column

Object

io.delta.standalone.expressions.LeafExpression

io.delta.standalone.expressions.Column

All Implemented Interfaces:

Expression

public final class Column
extends LeafExpression

A column whose row-value will be computed based on the data in a RowRecord.

It is recommended that you instantiate using an existing table schema StructType with StructType.column(String). For example, mySchema.column(columnName).

Only supports primitive data types, see Delta Transaction Log Protocol: Primitive Types.

Constructor Summary

Constructors

Constructor and Description
Column(String name, DataType dataType)

Method Summary

Modifier and Type	Method and Description
DataType	dataType()
boolean	equals(Object o)
Object	eval(RowRecord record)
int	hashCode()
String	name()
java.util.Set<String>	references()
String	toString()

Methods inherited from class io.delta.standalone.expressions.LeafExpression

children

Methods inherited from class Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Column

public Column(String name,
              DataType dataType)

Method Detail

name

public String name()

eval

public Object eval(RowRecord record)

Parameters:

record - the input record to evaluate.

Returns:

the result of evaluating this expression on the given input RowRecord.

dataType

public DataType dataType()

Returns:

the DataType of the result of evaluating this expression.

toString

public String toString()

Specified by:

toString in interface Expression

Overrides:

toString in class Object

Returns:

the String representation of this expression.

references

public java.util.Set<String> references()

Specified by:

references in interface Expression

Overrides:

references in class LeafExpression

Returns:

the names of columns referenced by this expression.

equals

public boolean equals(Object o)

Specified by:

equals in class LeafExpression

hashCode

public int hashCode()

Specified by:

hashCode in class LeafExpression