Package dev.frostlake.executor.expressions

Class WhenClause

java.lang.Object

dev.frostlake.executor.expressions.WhenClause

public class WhenClause
extends Object

Constructor Summary

Constructors

Constructor	Description
WhenClause(Expression condition, Expression result)
WhenClause(Expression condition, Expression result, boolean operandMatch)	A WHEN of either CASE form.

Method Summary

Modifier and Type	Method	Description
Expression	getCondition()
Expression	getResult()
boolean	isOperandMatch()	Whether this WHEN belongs to a simple CASE (CASE x WHEN v THEN r), whose condition is the operand's equality to the value.

Methods inherited from class java.lang.Object

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

Constructor Details

WhenClause

public WhenClause(Expression condition,
 Expression result)

WhenClause

public WhenClause(Expression condition,
 Expression result,
 boolean operandMatch)

A WHEN of either CASE form.

Parameters:

condition - the condition, for a simple CASE the operand's equality to the WHEN value

result - the THEN result

operandMatch - whether the condition matches a simple CASE's operand against its WHEN value

Method Details

getCondition

public Expression getCondition()

getResult

public Expression getResult()

isOperandMatch

public boolean isOperandMatch()

Whether this WHEN belongs to a simple CASE (CASE x WHEN v THEN r), whose condition is the operand's equality to the value. The planner matches such a value as it matches a DECODE search, which it does not do for a searched CASE's condition: live settles CASE n WHEN 7 THEN … as never taken over a column holding a NULL, and leaves CASE WHEN n = 7 THEN … open.

Returns:

true for a simple CASE's WHEN