Field Detail

• rcl

  private ResultColumnList rcl

• skipOverClass

  private java.lang.Class<?> skipOverClass

• tableNumber

  private int tableNumber

Constructor Detail

• ReplaceWindowFuncCallsWithCRVisitor

  ReplaceWindowFuncCallsWithCRVisitor​(ResultColumnList rcl,
                                      int tableNumber,
                                      java.lang.Class<?> skipOverClass)

  Replace all window function calls with column references. Add the reference to the RCL. Delegates most work to WindowFunctionNode.replaceCallsWithColumnReferences(rcl, tableNumber).

  Parameters:

  rcl - the result column list

  tableNumber - The tableNumber for the new CRs

  skipOverClass - Don't go past this

Method Detail

• visit

  public Visitable visit​(Visitable node)
                  throws StandardException

  Don't do anything unless we have a window function node node. Visitor override.

  Specified by:

  visit in interface Visitor

  Parameters:

  node - the node to process

  Returns:

  a query tree node. Often times this is the same node that was passed in, but Visitors that replace nodes with other nodes will use this to return the new replacement node.

  Throws:

  StandardException - may be throw an error as needed by the visitor (i.e. may be a normal error if a particular node is found, e.g. if checking a group by, we don't expect to find any ColumnReferences that aren't under an AggregateNode -- the easiest thing to do is just throw an error when we find the questionable node).

  See Also:

  Visitor.visit(org.apache.derby.iapi.sql.compile.Visitable)

• skipChildren

  public boolean skipChildren​(Visitable node)

  Don't visit children under the skipOverClass node, if it isn't null. Visitor override.

  Specified by:

  skipChildren in interface Visitor

  Parameters:

  node - the node to process

  Returns:

  true/false

  See Also:

  Visitor.skipChildren(org.apache.derby.iapi.sql.compile.Visitable)

• visitChildrenFirst

  public boolean visitChildrenFirst​(Visitable node)

  Visitor override.

  Specified by:

  visitChildrenFirst in interface Visitor

  Parameters:

  node - the top node of a sub-tree about to be visited

  Returns:

  false

  See Also:

  Visitor.visitChildrenFirst(org.apache.derby.iapi.sql.compile.Visitable)

• stopTraversal

  public boolean stopTraversal()

  Visitor override.

  Specified by:

  stopTraversal in interface Visitor

  Returns:

  false

  See Also:

  Visitor.skipChildren(org.apache.derby.iapi.sql.compile.Visitable)