core/sql/comexe/ComTdbPackRows.cpp

/**********************************************************************
// @@@ START COPYRIGHT @@@
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
//
// @@@ END COPYRIGHT @@@
**********************************************************************/
/* -*-C++-*-
****************************************************************************
*
* File:         ComTdbPackRows.cpp
* Description:  
*
* Created:      5/6/98
* Language:     C++
*
*
*
*
****************************************************************************
*/

#include "ComTdbPackRows.h"
#include "ComTdbCommon.h"

//////////////////////////////////////////////////////////////////////////////
//
//  TDB procedures
//
//////////////////////////////////////////////////////////////////////////////

// Default Constructor.
ComTdbPackRows::ComTdbPackRows() :
  ComTdb(ComTdb::ex_PACKROWS,eye_PACKROWS),
  packTuppIndex_(0)
{
}

// Copy Constructor.
ComTdbPackRows::ComTdbPackRows(const ComTdbPackRows* packTdb)
  : ComTdb(ComTdb::ex_PACKROWS,eye_PACKROWS),
    childTdb_(packTdb->childTdb_),
    packExpr_(packTdb->packExpr_),
    predExpr_(packTdb->predExpr_),
    packTuppLen_(packTdb->packTuppLen_),
    givenCriDesc_(packTdb->givenCriDesc_),
    returnedCriDesc_(packTdb->returnedCriDesc_),
    fromParent_(packTdb->fromParent_),
    toParent_(packTdb->toParent_),
    packTuppIndex_(packTdb->packTuppIndex_),
    bufferSize_(10000),
    noOfBuffers_(5)
{
}

// Constructor.
//
// Parameters
//
// ComTdb* childTdb
//  IN: The child of this Pack TDB.
//
// ex_expr* packExpr
//  IN: The expression to copy a row into a packed row.
//
// ex_expr* predExpr
//  IN: The expression to apply a selection predicates on the packed row.
//
// const unsigned short packTuppIndex
//  IN: The index of the tuple generated by the operator in the ATP.
//
// long packTuppLen
//  IN: Length of the tuple generated by the operator.
//
// ex_cri_desc* givenCriDesc
//  IN: the Cri Descriptor given to this node by its parent.
//
// ex_cri_desc* returnedCriDesc
//  IN: the Cri Descriptor return to the parent node.
//
// queue_index fromParent
//  IN: Recommended queue size for the down queue used to communicate
//      with the parent.
//
// queue_index toParent
//  IN: Recommended queue size for the up queue used to communicate
//      with the parent.
//
ComTdbPackRows::ComTdbPackRows(ComTdb* childTdb,
                     ex_expr* packExpr,
                     ex_expr* predExpr,
                     const unsigned short packTuppIndex,
                     Lng32 packTuppLen,
                     ex_cri_desc* givenCriDesc,
                     ex_cri_desc* returnedCriDesc,
                     queue_index fromParent,
                     queue_index toParent) :
  ComTdb(ComTdb::ex_PACKROWS,eye_PACKROWS),
  childTdb_(childTdb),
  packExpr_(packExpr),
  predExpr_(predExpr),
  packTuppIndex_(packTuppIndex),
  packTuppLen_(packTuppLen),
  givenCriDesc_(givenCriDesc),
  returnedCriDesc_(returnedCriDesc),
  fromParent_(fromParent),
  toParent_(toParent),
  bufferSize_(10024),
  noOfBuffers_(5)
{
}

void ComTdbPackRows::display() const 
{
  // Do nothing for now.
}

// Pack the Pack node (double pack?) for transmission between processes.
Long ComTdbPackRows::pack(void * space)
{
  // Pack the child TDB.
  childTdb_.pack(space);

  // Pack all the pointers that can be reached from data members of TDB.
  givenCriDesc_.pack(space);
  returnedCriDesc_.pack(space);
  packExpr_.pack(space);
  predExpr_.pack(space);

  // Return the packed pointer to 'this', so that my parent can store the
  // packed version of my address.
  return ComTdb::pack(space);
}

// Unpack the pack TDB after transmission between processes.
Lng32 ComTdbPackRows::unpack(void * base, void * reallocator)
{
  if(childTdb_.unpack(base, reallocator)) return -1;
  if(givenCriDesc_.unpack(base, reallocator)) return -1;
  if(returnedCriDesc_.unpack(base, reallocator)) return -1;
  if(packExpr_.unpack(base, reallocator)) return -1;
  if(predExpr_.unpack(base, reallocator)) return -1;
  return ComTdb::unpack(base, reallocator);
}

// We are observing order queue protocol.
Int32 ComTdbPackRows::orderedQueueProtocol() const { return -1; }