public class BaseColumnNode extends ValueNode
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
Constructor and Description |
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BaseColumnNode() |
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 |
getColumnName()
Get the name of this column
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java.lang.String |
getSchemaName()
Get the user-supplied schema name for this column's table.
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java.lang.String |
getTableName()
Get the user-supplied table name of this column.
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void |
init(java.lang.Object columnName,
java.lang.Object tableName,
java.lang.Object type)
Initializer for when you only have the column name.
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protected boolean |
isEquivalent(ValueNode o)
Tests if this node is equivalent to the specified ValueNode.
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java.lang.String |
toString()
Convert this object to a String.
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getSourceResultColumn, 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, printSubNodes, setBeginOffset, setDebugOutput, setEndOffset, setNodeType, setParserContext, setUserData, stackPrint, treePrint, treePrint, treePrint
public void init(java.lang.Object columnName, java.lang.Object tableName, java.lang.Object type) throws StandardException
init
in class QueryTreeNode
columnName
- The name of the column being referencedtableName
- The qualification for the columntype
- DataTypeDescriptor for the columnStandardException
- Thrown on errorpublic void copyFrom(QueryTreeNode node) throws StandardException
copyFrom
in class ValueNode
StandardException
public java.lang.String toString()
public java.lang.String getColumnName()
getColumnName
in class ValueNode
public java.lang.String getTableName()
getTableName
in class ValueNode
public java.lang.String getSchemaName() throws StandardException
getSchemaName
in class ValueNode
StandardException
protected boolean isEquivalent(ValueNode o)
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.Copyright © 2013. All Rights Reserved.