public class VirtualColumnNode extends ValueNode
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
Constructor and Description |
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VirtualColumnNode() |
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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java.lang.String |
getSchemaName()
Get the name of the schema the ResultColumn's table is in, if any.
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ResultColumn |
getSourceColumn()
Return the ResultColumn that is the source of this VirtualColumnNode.
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ResultSetNode |
getSourceResultSet()
Return the ResultSetNode that is the source of this VirtualColumnNode.
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java.lang.String |
getTableName()
Get the name of the table the ResultColumn is in, if any.
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DataTypeDescriptor |
getType()
Get the DataTypeDesciptor from this Node.
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void |
init(java.lang.Object sourceResultSet,
java.lang.Object sourceColumn,
java.lang.Object columnId)
Initializer for a VirtualColumnNode.
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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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void |
setType(DataTypeDescriptor dtd)
Set the DataTypeDescriptor for this ValueNode.
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getColumnName, getSourceResultColumn, getTypeId, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isConstantExpression, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeType, setNullability, 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 sourceResultSet, java.lang.Object sourceColumn, java.lang.Object columnId) throws StandardException
init
in class QueryTreeNode
sourceResultSet
- The ResultSetNode where the value is originatingsourceColumn
- The ResultColumn where the value is originatingcolumnId
- The columnId within the current RowStandardException
- Thrown on errorpublic void copyFrom(QueryTreeNode node) throws StandardException
copyFrom
in class ValueNode
StandardException
public void printSubNodes(int depth)
printSubNodes
in class QueryTreeNode
depth
- The depth of this node in the treepublic ResultSetNode getSourceResultSet()
public ResultColumn getSourceColumn()
public java.lang.String getTableName()
getTableName
in class ValueNode
public java.lang.String getSchemaName() throws StandardException
getSchemaName
in class ValueNode
StandardException
public DataTypeDescriptor getType()
public void setType(DataTypeDescriptor dtd) throws StandardException
ValueNode
setType
in class ValueNode
dtd
- The DataTypeDescriptor to set in this ValueNodeStandardException
protected boolean isEquivalent(ValueNode o) throws StandardException
ValueNode
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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