org.apache.phoenix.expression

Class CoerceExpression

java.lang.Object

org.apache.phoenix.expression.BaseExpression

org.apache.phoenix.expression.BaseSingleExpression

org.apache.phoenix.expression.CoerceExpression

All Implemented Interfaces:

org.apache.hadoop.io.Writable, Expression, PDatum

public class CoerceExpression
extends BaseSingleExpression

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.phoenix.expression.BaseExpression

BaseExpression.ExpressionComparabilityWrapper

Field Summary

Fields inherited from class org.apache.phoenix.expression.BaseSingleExpression

children

Constructor Summary

Constructors

Constructor and Description
CoerceExpression()
CoerceExpression(List<Expression> children, PDataType toType, SortOrder toSortOrder, Integer maxLength, boolean rowKeyOrderOptimizable)

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	accept(ExpressionVisitor<T> visitor) Means of traversing expression tree through visitor.
CoerceExpression	clone(List<Expression> children)
static Expression	create(Expression expression, PDataType toType)
static Expression	create(Expression expression, PDataType toType, SortOrder toSortOrder, Integer maxLength)
static Expression	create(Expression expression, PDataType toType, SortOrder toSortOrder, Integer maxLength, boolean rowKeyOrderOptimizable)
boolean	equals(Object obj)
boolean	evaluate(Tuple tuple, ImmutableBytesWritable ptr) Access the value by setting a pointer to it (as opposed to making a copy of it which can be expensive)
PDataType	getDataType()
Integer	getMaxLength()
SortOrder	getSortOrder()
int	hashCode()
void	readFields(DataInput input)
String	toString()
void	write(DataOutput output)

Methods inherited from class org.apache.phoenix.expression.BaseSingleExpression

getChild, getChildren, isNullable, requiresFinalEvaluation, reset

Methods inherited from class org.apache.phoenix.expression.BaseExpression

acceptChildren, coerce, coerce, getDeterminism, getScale, isStateless

Methods inherited from class java.lang.Object

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

Constructor Detail

CoerceExpression

public CoerceExpression()

CoerceExpression

public CoerceExpression(List<Expression> children,
                PDataType toType,
                SortOrder toSortOrder,
                Integer maxLength,
                boolean rowKeyOrderOptimizable)

Method Detail

create

public static Expression create(Expression expression,
                PDataType toType)
                         throws SQLException

Throws:

SQLException

create

public static Expression create(Expression expression,
                PDataType toType,
                SortOrder toSortOrder,
                Integer maxLength)
                         throws SQLException

Throws:

SQLException

create

public static Expression create(Expression expression,
                PDataType toType,
                SortOrder toSortOrder,
                Integer maxLength,
                boolean rowKeyOrderOptimizable)
                         throws SQLException

Throws:

SQLException

clone

public CoerceExpression clone(List<Expression> children)

getMaxLength

public Integer getMaxLength()

Specified by:

getMaxLength in interface PDatum

Overrides:

getMaxLength in class BaseExpression

Returns:

the actual length of the column. For decimal, it would be its precision. For char or varchar, it would be the maximum length as specified during schema definition.

hashCode

public int hashCode()

Overrides:

hashCode in class BaseSingleExpression

equals

public boolean equals(Object obj)

Overrides:

equals in class BaseSingleExpression

readFields

public void readFields(DataInput input)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Overrides:

readFields in class BaseSingleExpression

Throws:

IOException

write

public void write(DataOutput output)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Overrides:

write in class BaseSingleExpression

Throws:

IOException

evaluate

public boolean evaluate(Tuple tuple,
               ImmutableBytesWritable ptr)

Description copied from interface: Expression

Access the value by setting a pointer to it (as opposed to making a copy of it which can be expensive)

Parameters:

tuple - Single row result during scan iteration

ptr - Pointer to byte value being accessed

Returns:

true if the expression could be evaluated (i.e. ptr was set) and false otherwise

getDataType

public PDataType getDataType()

Returns:

data type of the column

getSortOrder

public SortOrder getSortOrder()

Specified by:

getSortOrder in interface PDatum

Overrides:

getSortOrder in class BaseExpression

Returns:

The SortOrder for this column, never null

accept

public <T> T accept(ExpressionVisitor<T> visitor)

Description copied from interface: Expression

Means of traversing expression tree through visitor.

Specified by:

accept in interface Expression

Overrides:

accept in class BaseSingleExpression

toString

public String toString()

Overrides:

toString in class Object