public class ConditionalNode extends ValueNode
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
Constructor and Description |
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ConditionalNode() |
Modifier and Type | Method and Description |
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void |
copyFrom(QueryTreeNode node)
Fill this node with a deep copy of the given node.
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ValueNode |
getElseNode() |
ValueNode |
getTestCondition() |
ValueNodeList |
getThenElseList() |
ValueNode |
getThenNode() |
void |
init(java.lang.Object testCondition,
java.lang.Object thenElseList,
java.lang.Object thisIsNullIfNode)
Initializer for a ConditionalNode
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boolean |
isConstantExpression()
Return whether or not this expression tree represents a constant expression.
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protected boolean |
isEquivalent(ValueNode o)
Tests if this node is equivalent to the specified ValueNode.
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boolean |
isNullIfNode() |
void |
printSubNodes(int depth)
Prints the sub-nodes of this object.
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void |
setElseNode(ValueNode elseNode) |
void |
setTestCondition(ValueNode testCondition) |
void |
setThenNode(ValueNode thenNode) |
getColumnName, getSchemaName, getSourceResultColumn, getTableName, getType, getTypeId, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, setNullability, setType, toString
accept, convertDefaultNode, debugFlush, debugPrint, formatNodeString, getBeginOffset, getDebugOutput, getEndOffset, getNodeFactory, getNodeType, getNullNode, getParserContext, getStatementType, getUserData, init, init, init, init, init, init, init, init, init, init, init, init, isInstanceOf, makeTableName, makeTableName, nodeHeader, printLabel, setBeginOffset, setDebugOutput, setEndOffset, setNodeType, setParserContext, setUserData, stackPrint, treePrint, treePrint, treePrint
public void init(java.lang.Object testCondition, java.lang.Object thenElseList, java.lang.Object thisIsNullIfNode)
init
in class QueryTreeNode
testCondition
- The boolean test conditionthenElseList
- ValueNodeList with then and else expressionspublic void copyFrom(QueryTreeNode node) throws StandardException
copyFrom
in class ValueNode
StandardException
public ValueNode getTestCondition()
public void setTestCondition(ValueNode testCondition)
public ValueNodeList getThenElseList()
public ValueNode getThenNode()
public void setThenNode(ValueNode thenNode)
public ValueNode getElseNode()
public void setElseNode(ValueNode elseNode)
public boolean isNullIfNode()
public void printSubNodes(int depth)
printSubNodes
in class QueryTreeNode
depth
- The depth of this node in the treepublic boolean isConstantExpression()
isConstantExpression
in class ValueNode
protected boolean isEquivalent(ValueNode o) throws StandardException
This method provides basic expression matching facility for the derived class of ValueNode and it is used by the language layer to compare the node structural form of the two expressions for equivalence at bind phase.
Note that it is not comparing the actual row values at runtime to produce a result; hence, when comparing SQL NULLs, they are considered to be equivalent and not unknown.
One usage case of this method in this context is to compare the select column expression against the group by expression to check if they are equivalent. e.g.:
SELECT c1+c2 FROM t1 GROUP BY c1+c2
In general, node equivalence is determined by the derived class of ValueNode. But they generally abide to the rules below:
isEquivalent
in class ValueNode
o
- the node to compare this ValueNode against.true
if the two nodes are equivalent,
false
otherwise.StandardException
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