public class ColumnReference extends ValueNode
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
Constructor and Description |
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ColumnReference() |
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 of this column.
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java.lang.String |
getSQLColumnName()
Get the column name for purposes of error
messages or debugging.
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java.lang.String |
getTableName()
Get the user-supplied table name of this column.
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TableName |
getTableNameNode()
Return the table name as the node it is.
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void |
init(java.lang.Object columnName,
java.lang.Object tableName)
Initializer.
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void |
init(java.lang.Object columnName,
java.lang.Object tableName,
java.lang.Object tokBeginOffset,
java.lang.Object tokEndOffset)
Initializer.
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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 |
setTableNameNode(TableName tableName) |
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, isInstanceOf, makeTableName, makeTableName, nodeHeader, printLabel, setBeginOffset, setDebugOutput, setEndOffset, setNodeType, setParserContext, setUserData, stackPrint, treePrint, treePrint, treePrint
public void init(java.lang.Object columnName, java.lang.Object tableName, java.lang.Object tokBeginOffset, java.lang.Object tokEndOffset)
init
in class QueryTreeNode
columnName
- The name of the column being referencedtableName
- The qualification for the columntokBeginOffset
- begin position of token for the column name
identifier from parser.tokEndOffsetend
- position of token for the column name
identifier from parser.public void init(java.lang.Object columnName, java.lang.Object tableName)
init
in class QueryTreeNode
columnName
- The name of the column being referencedtableName
- The qualification for the columnpublic void copyFrom(QueryTreeNode node) throws StandardException
copyFrom
in class ValueNode
StandardException
public java.lang.String toString()
public void printSubNodes(int depth)
printSubNodes
in class QueryTreeNode
depth
- The depth of this node in the treepublic java.lang.String getSQLColumnName()
public java.lang.String getColumnName()
getColumnName
in class ValueNode
public java.lang.String getTableName()
getTableName
in class ValueNode
public TableName getTableNameNode()
public void setTableNameNode(TableName tableName)
public java.lang.String getSchemaName()
getSchemaName
in class ValueNode
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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