SQLite

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.167 2004/05/18 09:58:08 danielk1977 Exp $
*/
#include "sqliteInt.h"


/*
** Allocate a new Select structure and return a pointer to that
** structure.

  pParse->nAgg = 0;
  pParse->useAgg = 0;
}

/*
** Insert code into "v" that will push the record on the top of the
** stack into the sorter.






*/
static void pushOntoSorter(Parse *pParse, Vdbe *v, ExprList *pOrderBy){
  char *zSortOrder;
  int i;
  zSortOrder = sqliteMalloc( pOrderBy->nExpr + 1 );
  if( zSortOrder==0 ) return;
  for(i=0; i<pOrderBy->nExpr; i++){

  /* Control jumps to here if an error is encountered above, or upon
  ** successful coding of the SELECT.
  */
select_end:
  sqliteAggregateInfoReset(pParse);
  return rc;
}

*/
void sqlite3VdbeCleanupCursor(Cursor*);
void sqlite3VdbeSorterReset(Vdbe*);
void sqlite3VdbeAggReset(Agg*);
void sqlite3VdbeKeylistFree(Keylist*);
void sqliteVdbePopStack(Vdbe*,int);
int sqlite3VdbeCursorMoveto(Cursor*);
int sqlite3VdbeByteSwap(int);
#if !defined(NDEBUG) || defined(VDBE_PROFILE)
void sqlite3VdbePrintOp(FILE*, int, Op*);
#endif
int sqlite3VdbeSerialTypeLen(u64);
u64 sqlite3VdbeSerialType(const Mem *);
int sqlite3VdbeSerialPut(unsigned char *, const Mem *);
int sqlite3VdbeSerialGet(const unsigned char *, u64, Mem *);

  sqliteFree(p->aOp);
  sqliteFree(p->aLabel);
  sqliteFree(p->aStack);
  p->magic = VDBE_MAGIC_DEAD;
  sqliteFree(p);
}

/*
** Convert an integer in between the native integer format and
** the bigEndian format used as the record number for tables.
**
** The bigEndian format (most significant byte first) is used for
** record numbers so that records will sort into the correct order
** even though memcmp() is used to compare the keys.  On machines
** whose native integer format is little endian (ex: i486) the
** order of bytes is reversed.  On native big-endian machines
** (ex: Alpha, Sparc, Motorola) the byte order is the same.
**
** This function is its own inverse.  In other words
**
**         X == byteSwap(byteSwap(X))
*/
int sqlite3VdbeByteSwap(int x){
  union {
     char zBuf[sizeof(int)];
     int i;
  } ux;
  ux.zBuf[3] = x&0xff;
  ux.zBuf[2] = (x>>8)&0xff;
  ux.zBuf[1] = (x>>16)&0xff;
  ux.zBuf[0] = (x>>24)&0xff;
  return ux.i;
}

/*
** If a MoveTo operation is pending on the given cursor, then do that
** MoveTo now.  Return an error code.  If no MoveTo is pending, this
** routine does nothing and returns SQLITE_OK.
*/
int sqlite3VdbeCursorMoveto(Cursor *p){
  if( p->deferredMoveto ){

    sqlite3_search_count++;
    p->deferredMoveto = 0;
    p->cacheValid = 0;
  }
  return SQLITE_OK;
}


/*
** FIX ME
**
** This function is included temporarily so that regression tests have
** a chance of passing. It always uses memcmp().
*/
int sqlite2BtreeKeyCompare(

  rc = sqlite3BtreeKey(pCur, 0, nCellKey, pMallocedKey);
  *pResult = memcmp(pMallocedKey, pKey, nKey>nCellKey?nCellKey:nKey);
  sqliteFree(pMallocedKey);

  return rc;
}


/*
** The following functions:
**
** sqlite3VdbeSerialType()
** sqlite3VdbeSerialTypeLen()
** sqlite3VdbeSerialRead()