org.apache.phoenix.expression

Class ComparisonExpression

java.lang.Object

org.apache.phoenix.expression.BaseExpression

org.apache.phoenix.expression.BaseCompoundExpression

org.apache.phoenix.expression.ComparisonExpression

All Implemented Interfaces:

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

public class ComparisonExpression
extends BaseCompoundExpression

Implementation for <,<=,>,>=,=,!= comparison expressions

Since:

0.1

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.BaseCompoundExpression

children

Constructor Summary

Constructors

Constructor and Description
ComparisonExpression()
ComparisonExpression(List<Expression> children, CompareFilter.CompareOp op)

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	accept(ExpressionVisitor<T> visitor) Means of traversing expression tree through visitor.
ComparisonExpression	clone(List<Expression> children)
static Expression	create(CompareFilter.CompareOp op, List<Expression> children, ImmutableBytesWritable ptr)
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()
CompareFilter.CompareOp	getFilterOp()
int	hashCode()
void	readFields(DataInput input)
String	toString()
static String	toString(CompareFilter.CompareOp op, List<Expression> children)
void	write(DataOutput output)

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

getChildren, getDeterminism, isNullable, isStateless, requiresFinalEvaluation, reset

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

acceptChildren, coerce, coerce, getMaxLength, getScale, getSortOrder

Methods inherited from class java.lang.Object

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

Constructor Detail

ComparisonExpression

public ComparisonExpression()

ComparisonExpression

public ComparisonExpression(List<Expression> children,
                    CompareFilter.CompareOp op)

Method Detail

create

public static Expression create(CompareFilter.CompareOp op,
                List<Expression> children,
                ImmutableBytesWritable ptr)
                         throws SQLException

Throws:

SQLException

clone

public ComparisonExpression clone(List<Expression> children)

hashCode

public int hashCode()

Overrides:

hashCode in class BaseCompoundExpression

equals

public boolean equals(Object obj)

Overrides:

equals in class BaseCompoundExpression

getDataType

public PDataType getDataType()

Returns:

data type of the column

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

readFields

public void readFields(DataInput input)
                throws IOException

Specified by:

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

Overrides:

readFields in class BaseCompoundExpression

Throws:

IOException

write

public void write(DataOutput output)
           throws IOException

Specified by:

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

Overrides:

write in class BaseCompoundExpression

Throws:

IOException

accept

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

Description copied from interface: Expression

Means of traversing expression tree through visitor.

getFilterOp

public CompareFilter.CompareOp getFilterOp()

toString

public static String toString(CompareFilter.CompareOp op,
              List<Expression> children)

toString

public String toString()

Overrides:

toString in class BaseCompoundExpression