public class CoalesceFunctionNode extends ValueNode
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
Constructor and Description |
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CoalesceFunctionNode() |
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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ValueNodeList |
getArgumentsList() |
java.lang.String |
getFunctionName() |
void |
init(java.lang.Object functionName,
java.lang.Object argumentsList)
Initializer for a CalesceFunctionNode
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protected boolean |
isEquivalent(ValueNode o)
Tests if this node is equivalent to the specified ValueNode.
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void |
printSubNodes(int depth)
Prints the sub-nodes of this object.
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java.lang.String |
toString()
Convert this object to a String.
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getColumnName, getSchemaName, getSourceResultColumn, getTableName, getType, getTypeId, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isConstantExpression, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, setNullability, setType
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 functionName, java.lang.Object argumentsList)
init
in class QueryTreeNode
functionName
- Tells if the function was called with name COALESCE or with name VALUEargumentsList
- The list of arguments to the coalesce/value functionpublic void copyFrom(QueryTreeNode node) throws StandardException
copyFrom
in class ValueNode
StandardException
public java.lang.String getFunctionName()
public ValueNodeList getArgumentsList()
public java.lang.String toString()
ValueNode
public void printSubNodes(int depth)
printSubNodes
in class QueryTreeNode
depth
- The depth of this node in the treeprotected 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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