Package org.apache.cassandra.index.sai.plan

Class Expression

java.lang.Object

org.apache.cassandra.index.sai.plan.Expression

Direct Known Subclasses:

Expression.IndexedExpression, Expression.UnindexedExpression

public abstract class Expression
extends Object

An Expression is an internal representation of an index query operation. They are built from CQL Operator and ByteBuffer value pairs for a single column.

Each Expression consists of an Expression.IndexOperator and optional lower and upper Expression.Bounds.

The Expression.IndexedExpression has a backing StorageAttachedIndex for the index query but order to support CQL expressions on columns that do not have indexes or use operators that are not supported by the index there is an Expression.UnindexedExpression that does not provide a StorageAttachedIndex and can only be used for post-filtering

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Expression.Bound
static class	Expression.IndexedExpression
static enum	Expression.IndexOperator
static class	Expression.UnindexedExpression
static class	Expression.Value	A representation of a column value in its raw and encoded form.

Field Summary

Fields

Modifier and Type	Field	Description
Expression.Bound	lower
boolean	lowerInclusive
protected Expression.IndexOperator	operator
Expression.Bound	upper
boolean	upperInclusive

Method Summary

Modifier and Type	Method	Description
Expression	add(Operator op, ByteBuffer value)	This adds an operation to the current Expression instance and returns the current instance.
static Expression	create(StorageAttachedIndex index)
static Expression	create(IndexTermType indexTermType)
boolean	equals(Object other)
abstract StorageAttachedIndex	getIndex()
Expression.IndexOperator	getIndexOperator()
IndexTermType	getIndexTermType()
int	hashCode()
abstract boolean	isNotIndexed()
boolean	isSatisfiedBy(ByteBuffer columnValue)	Used in post-filtering to determine is an indexed value matches the expression
Expression.Bound	lower()
static boolean	supportsOperator(Operator operator)
String	toString()
Expression.Bound	upper()

Methods inherited from class java.lang.Object

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

Field Details

operator

protected Expression.IndexOperator operator

lower

public Expression.Bound lower

upper

public Expression.Bound upper

upperInclusive

public boolean upperInclusive

lowerInclusive

public boolean lowerInclusive

Method Details

create

public static Expression create(StorageAttachedIndex index)

create

public static Expression create(IndexTermType indexTermType)

supportsOperator

public static boolean supportsOperator(Operator operator)

isNotIndexed

public abstract boolean isNotIndexed()

getIndex

public abstract StorageAttachedIndex getIndex()

getIndexOperator

public Expression.IndexOperator getIndexOperator()

getIndexTermType

public IndexTermType getIndexTermType()

lower

public Expression.Bound lower()

upper

public Expression.Bound upper()

add

public Expression add(Operator op,
 ByteBuffer value)

This adds an operation to the current Expression instance and returns the current instance.

Parameters:

op - the CQL3 operation

value - the expression value

Returns:

the current expression with the added operation

isSatisfiedBy

public boolean isSatisfiedBy(ByteBuffer columnValue)

Used in post-filtering to determine is an indexed value matches the expression

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object other)

Overrides:

equals in class Object