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java.lang.Objectorg.h2.expression.Expression
org.h2.expression.JavaAggregate
public class JavaAggregate
This class wraps a user-defined aggregate.
| Constructor Summary | |
|---|---|
JavaAggregate(UserAggregate userAggregate,
Expression[] args,
Select select)
|
|
| Method Summary | |
|---|---|
int |
getCost()
Estimate the cost to process the expression. |
int |
getDisplaySize()
Get the display size of this expression. |
long |
getPrecision()
Get the precision of this expression. |
int |
getScale()
Get the scale of this expression. |
java.lang.String |
getSQL()
Get the SQL statement of this expression. |
int |
getType()
Return the data type. |
Value |
getValue(Session session)
Return the resulting value for the current row. |
boolean |
isEverything(ExpressionVisitor visitor)
Check if this expression and all sub-expressions can fulfill a criteria. |
void |
mapColumns(ColumnResolver resolver,
int level)
Map the columns of the resolver to expression columns. |
Expression |
optimize(Session session)
Try to optimize the expression. |
void |
setEvaluatable(TableFilter tableFilter,
boolean b)
Tell the expression columns whether the table filter can return values now. |
void |
updateAggregate(Session session)
Update an aggregate value. |
| Methods inherited from class org.h2.expression.Expression |
|---|
addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getExpressionColumns, getExpressionColumns, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getTableAlias, getTableName, isAutoIncrement, isConstant, isValueSet, isWildcard, toString |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public JavaAggregate(UserAggregate userAggregate,
Expression[] args,
Select select)
| Method Detail |
|---|
public int getCost()
Expression
getCost in class Expressionpublic long getPrecision()
Expression
getPrecision in class Expressionpublic int getDisplaySize()
Expression
getDisplaySize in class Expressionpublic int getScale()
Expression
getScale in class Expressionpublic java.lang.String getSQL()
Expression
getSQL in class Expressionpublic int getType()
Expression
getType in class Expressionpublic boolean isEverything(ExpressionVisitor visitor)
Expression
isEverything in class Expressionvisitor - the visitor
public void mapColumns(ColumnResolver resolver,
int level)
Expression
mapColumns in class Expressionresolver - the column resolverlevel - the subquery nesting levelpublic Expression optimize(Session session)
Expression
optimize in class Expressionsession - the session
public void setEvaluatable(TableFilter tableFilter,
boolean b)
Expression
setEvaluatable in class ExpressiontableFilter - the table filterb - true if the table filter can return valuepublic Value getValue(Session session)
Expression
getValue in class Expressionsession - the session
public void updateAggregate(Session session)
Expression
updateAggregate in class Expressionsession - the session
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