Class CoalesceFunction

java.lang.Object

org.h2.expression.Expression

org.h2.expression.OperationN

org.h2.expression.function.FunctionN

org.h2.expression.function.CoalesceFunction

All Implemented Interfaces:

ExpressionWithVariableParameters, NamedExpression, HasSQL, Typed

public final class CoalesceFunction
extends FunctionN

A COALESCE, GREATEST, or LEAST function.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	COALESCE	COALESCE().
private final int	function
static final int	GREATEST	GREATEST() (non-standard).
static final int	LEAST	LEAST() (non-standard).
private static final String[]	NAMES

Fields inherited from class OperationN

args, argsCount, type

Fields inherited from class Expression

AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES

Fields inherited from interface HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Constructor	Description
CoalesceFunction(int function)
CoalesceFunction(int function, Expression... args)

Method Summary

Modifier and Type	Method	Description
String	getName()	Get the name.
Value	getValue(SessionLocal session)	Return the resulting value for the current row.
Expression	optimize(SessionLocal session)	Try to optimize the expression.

Methods inherited from class FunctionN

getUnenclosedSQL, getValue

Methods inherited from class OperationN

addParameter, doneWithParameters, getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, optimizeArguments, setEvaluatable, updateAggregate

Methods inherited from class Expression

addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTableName, getWhenSQL, getWhenValue, isConstant, isIdentity, isNullConstant, isValueSet, isWhenConditionOperand, needParentheses, optimizeCondition, toString, writeExpressions, writeExpressions

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface HasSQL

getTraceSQL

Field Details

COALESCE

public static final int COALESCE

COALESCE().

See Also:

• Constant Field Values

GREATEST

public static final int GREATEST

GREATEST() (non-standard).

See Also:

• Constant Field Values

LEAST

public static final int LEAST

LEAST() (non-standard).

See Also:

• Constant Field Values

NAMES

private static final String[] NAMES

function

private final int function

Constructor Details

CoalesceFunction

public CoalesceFunction(int function)

CoalesceFunction

public CoalesceFunction(int function,
 Expression... args)

Method Details

getValue

public Value getValue(SessionLocal session)

Description copied from class: Expression

Return the resulting value for the current row.

Overrides:

getValue in class FunctionN

Parameters:

session - the session

Returns:

the result

optimize

public Expression optimize(SessionLocal session)

Description copied from class: Expression

Try to optimize the expression.

Specified by:

optimize in class Expression

Parameters:

session - the session

Returns:

the optimized expression

getName

public String getName()

Description copied from interface: NamedExpression

Get the name.

Returns:

the name in uppercase