Top Description Fields Constructors Methods
org.h2.expression

public abstract Class Operation2

extends Expression
Class Inheritance
Known Direct Subclasses
org.h2.expression.function.Function2, org.h2.expression.ArrayElementReference, org.h2.expression.BinaryOperation, org.h2.expression.CompatibilityDatePlusTimeOperation, org.h2.expression.IntervalOperation
Imports
org.h2.engine.SessionLocal, org.h2.table.ColumnResolver, .TableFilter, org.h2.value.TypeInfo
Operation with two arguments.

Field Summary

Modifier and TypeField and Description
protected Expression
left

The left part of the operation (the first argument).

protected Expression
right

The right part of the operation (the second argument).

protected TypeInfo
type

The type of the result.

Inherited from org.h2.expression.Expression:
AUTO_PARENTHESESMAP_IN_AGGREGATEMAP_IN_WINDOWMAP_INITIALWITH_PARENTHESESWITHOUT_PARENTHESES

Constructor Summary

AccessConstructor and Description
protected
Operation2(Expression left, Expression right)

Method Summary

Modifier and TypeMethod and Description
public int
getCost()

Implements abstract org.h2.expression.Expression.getCost.

Estimate the cost to process the expression.

public Expression
getSubexpression(int
0-based index
index)

Overrides org.h2.expression.Expression.getSubexpression.

Returns subexpression with specified index.

public int
getSubexpressionCount()

Overrides org.h2.expression.Expression.getSubexpressionCount.

Returns count of subexpressions.

public TypeInfo
getType()

Implements abstract org.h2.expression.Expression.getType.

Implements org.h2.value.Typed.getType.

Returns the data type.

public boolean
isEverything(ExpressionVisitor
the visitor
visitor)

Implements abstract org.h2.expression.Expression.isEverything.

Check if this expression and all sub-expressions can fulfill a criteria.

public void
mapColumns(ColumnResolver
the column resolver
resolver, int
the subquery nesting level
level, int
current state for nesting checks, initial value is MAP_INITIAL
state)

Implements abstract org.h2.expression.Expression.mapColumns.

Map the columns of the resolver to expression columns.

public void
setEvaluatable(TableFilter
the table filter
tableFilter, boolean
true if the table filter can return value
value)

Implements abstract org.h2.expression.Expression.setEvaluatable.

Tell the expression columns whether the table filter can return values now.

public void
updateAggregate(SessionLocal
the session
session, int
select stage
stage)

Implements abstract org.h2.expression.Expression.updateAggregate.

Update an aggregate value.

Inherited from org.h2.expression.Expression:
addFilterConditionscreateIndexConditionsgetAliasgetBooleanValuegetColumnNamegetColumnNameForViewgetEnclosedSQLgetNonAliasExpressiongetNotIfPossiblegetNullablegetSchemaNamegetSQLgetSQLgetSQLgetSQLgetTableAliasgetTableNamegetTypeIfStaticallyKnowngetUnenclosedSQLgetValuegetWhenSQLgetWhenValueisConstantisIdentityisNullConstantisValueSetisWhenConditionOperandneedParenthesesoptimizeoptimizeConditiontoStringwriteExpressionswriteExpressions

Field Detail

leftback to summary
protected Expression left

The left part of the operation (the first argument).

typeback to summary
protected TypeInfo type

The type of the result.

Constructor Detail

Operation2back to summary
protected Operation2(Expression left, Expression right)

Method Detail

getCostback to summary
public int getCost()

Implements abstract org.h2.expression.Expression.getCost.

Doc from org.h2.expression.Expression.getCost.

Estimate the cost to process the expression. Used when optimizing the query, to calculate the query plan with the lowest estimated cost.

Returns:int

the estimated cost

Annotations
@Override
getSubexpressionback to summary
public Expression getSubexpression(int index)

Overrides org.h2.expression.Expression.getSubexpression.

Doc from org.h2.expression.Expression.getSubexpression.

Returns subexpression with specified index.

Parameters
index:int

0-based index

Returns:Expression

subexpression with specified index, may be null

Annotations
@Override
getSubexpressionCountback to summary
public int getSubexpressionCount()

Overrides org.h2.expression.Expression.getSubexpressionCount.

Doc from org.h2.expression.Expression.getSubexpressionCount.

Returns count of subexpressions.

Returns:int

count of subexpressions

Annotations
@Override
getTypeback to summary
public TypeInfo getType()

Implements abstract org.h2.expression.Expression.getType.

Implements org.h2.value.Typed.getType.

Doc from org.h2.expression.Expression.getType.

Returns the data type. The data type may be unknown before the optimization phase.

Returns:TypeInfo

the data type

Annotations
@Override
isEverythingback to summary
public boolean isEverything(ExpressionVisitor visitor)

Implements abstract org.h2.expression.Expression.isEverything.

Doc from org.h2.expression.Expression.isEverything.

Check if this expression and all sub-expressions can fulfill a criteria. If any part returns false, the result is false.

Parameters
visitor:ExpressionVisitor

the visitor

Returns:boolean

if the criteria can be fulfilled

Annotations
@Override
mapColumnsback to summary
public void mapColumns(ColumnResolver resolver, int level, int state)

Implements abstract org.h2.expression.Expression.mapColumns.

Doc from org.h2.expression.Expression.mapColumns.

Map the columns of the resolver to expression columns.

Parameters
resolver:ColumnResolver

the column resolver

level:int

the subquery nesting level

state:int

current state for nesting checks, initial value is MAP_INITIAL

Annotations
@Override
setEvaluatableback to summary
public void setEvaluatable(TableFilter tableFilter, boolean value)

Implements abstract org.h2.expression.Expression.setEvaluatable.

Doc from org.h2.expression.Expression.setEvaluatable.

Tell the expression columns whether the table filter can return values now. This is used when optimizing the query.

Parameters
tableFilter:TableFilter

the table filter

value:boolean

true if the table filter can return value

Annotations
@Override
updateAggregateback to summary
public void updateAggregate(SessionLocal session, int stage)

Implements abstract org.h2.expression.Expression.updateAggregate.

Doc from org.h2.expression.Expression.updateAggregate.

Update an aggregate value. This method is called at statement execution time. It is usually called once for each row, but if the expression is used multiple times (for example in the column list, and as part of the HAVING expression) it is called multiple times - the row counter needs to be used to make sure the internal state is only updated once.

Parameters
session:SessionLocal

the session

stage:int

select stage

Annotations
@Override