public class JavaFunction extends Expression implements FunctionCall
Constructor and Description |
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JavaFunction(FunctionAlias functionAlias,
Expression[] args) |
Modifier and Type | Method and Description |
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Expression[] |
getArgs()
Get the function arguments.
|
int |
getCost()
Estimate the cost to process the expression.
|
int |
getDisplaySize()
Get the display size of this expression.
|
Expression[] |
getExpressionColumns(Session session)
If this expression consists of column expressions it should return them.
|
String |
getName()
Get the name of the function.
|
long |
getPrecision()
Get the precision of this expression.
|
int |
getScale()
Get the scale of this expression.
|
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.
|
ValueResultSet |
getValueForColumnList(Session session,
Expression[] argList)
Get an empty result set with the column names set.
|
boolean |
isBufferResultSetToLocalTemp()
Should the return value ResultSet be buffered in a local temporary file?
|
boolean |
isDeterministic()
Whether the function always returns the same result for the same
parameters.
|
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.
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addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getExpressionColumns, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getTableAlias, getTableName, isAutoIncrement, isConstant, isValueSet, isWildcard, toString
public JavaFunction(FunctionAlias functionAlias, Expression[] args)
public Value getValue(Session session)
Expression
getValue
in class Expression
session
- the sessionpublic int getType()
Expression
getType
in interface FunctionCall
getType
in class Expression
public void mapColumns(ColumnResolver resolver, int level)
Expression
mapColumns
in class Expression
resolver
- the column resolverlevel
- the subquery nesting levelpublic Expression optimize(Session session)
Expression
optimize
in interface FunctionCall
optimize
in class Expression
session
- the sessionpublic void setEvaluatable(TableFilter tableFilter, boolean b)
Expression
setEvaluatable
in class Expression
tableFilter
- the table filterb
- true if the table filter can return valuepublic int getScale()
Expression
getScale
in class Expression
public long getPrecision()
Expression
getPrecision
in class Expression
public int getDisplaySize()
Expression
getDisplaySize
in class Expression
public String getSQL()
Expression
getSQL
in interface FunctionCall
getSQL
in class Expression
public void updateAggregate(Session session)
Expression
updateAggregate
in class Expression
session
- the sessionpublic String getName()
FunctionCall
getName
in interface FunctionCall
public ValueResultSet getValueForColumnList(Session session, Expression[] argList)
FunctionCall
getValueForColumnList
in interface FunctionCall
session
- the sessionargList
- the argument list (some arguments may be null)public Expression[] getArgs()
FunctionCall
getArgs
in interface FunctionCall
public boolean isEverything(ExpressionVisitor visitor)
Expression
isEverything
in class Expression
visitor
- the visitorpublic int getCost()
Expression
getCost
in class Expression
public boolean isDeterministic()
FunctionCall
isDeterministic
in interface FunctionCall
public Expression[] getExpressionColumns(Session session)
Expression
getExpressionColumns
in class Expression
session
- the sessionpublic boolean isBufferResultSetToLocalTemp()
FunctionCall
isBufferResultSetToLocalTemp
in interface FunctionCall
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