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 1.362 2007/11/21 15:24:01 drh Exp $
*/
#include "sqliteInt.h"


/*
** Delete all the content of a Select structure but do not deallocate
** the select structure itself.

    int nSubSrc = pSubSrc->nSrc;
    int jointype = pSubitem->jointype;

    sqlite3DeleteTable(pSubitem->pTab);
    sqlite3_free(pSubitem->zDatabase);
    sqlite3_free(pSubitem->zName);
    sqlite3_free(pSubitem->zAlias);
    pSubitem->pTab = 0;
    pSubitem->zDatabase = 0;
    pSubitem->zName = 0;
    pSubitem->zAlias = 0;
    if( nSubSrc>1 ){
      int extra = nSubSrc - 1;
      for(i=1; i<nSubSrc; i++){
        pSrc = sqlite3SrcListAppend(db, pSrc, 0, 0);
        if( pSrc==0 ){
          p->pSrc = 0;
          return 1;
        }
      }
      p->pSrc = pSrc;
      for(i=pSrc->nSrc-1; i-extra>=iFrom; i--){
        pSrc->a[i] = pSrc->a[i-extra];
      }
    }
    for(i=0; i<nSubSrc; i++){

    ** more conservative than necessary, but much easier than enforcing
    ** an exact limit.
    */
    pParse->nHeight += sqlite3SelectExprHeight(p);
#endif
    sqlite3Select(pParse, pItem->pSelect, SRT_EphemTab, 
                 pItem->iCursor, p, i, &isAgg, 0);
    if( db->mallocFailed ){
      goto select_end;
    }
#if defined(SQLITE_TEST) || SQLITE_MAX_EXPR_DEPTH>0
    pParse->nHeight -= sqlite3SelectExprHeight(p);
#endif
    if( needRestoreContext ){
      pParse->zAuthContext = zSavedAuthContext;
    }
    pTabList = p->pSrc;

** on how SQLite interfaces are suppose to operate.
**
** The name of this file under configuration management is "sqlite.h.in".
** The makefile makes some minor changes to this file (such as inserting
** the version number) and changes its name to "sqlite3.h" as
** part of the build process.
**
** @(#) $Id: sqlite.h.in,v 1.271 2007/11/21 15:24:01 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.

**
** Duplicate extensions are detected so calling this routine multiple
** times with the same extension is harmless.
**
** This routine stores a pointer to the extension in an array
** that is obtained from malloc().  If you run a memory leak
** checker on your program and it reports a leak because of this
** array, then invoke [sqlite3_reset_auto_extension()] prior
** to shutdown to free the memory.
**
** Automatic extensions apply across all threads.
**
** This interface is experimental and is subject to change or
** removal in future releases of SQLite.
*/

# 2007 Aug 29
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# This test script checks that ticket #2784 has been fixed.
# 
# $Id: mallocE.test,v 1.1 2007/11/21 15:24:01 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Only run these tests if memory debugging is turned on.
#
ifcapable !memdebug {
   puts "Skipping mallocE tests: not compiled with -DSQLITE_MEMDEBUG..."
   finish_test
   return
}
source $testdir/malloc_common.tcl

set PREP { 
  PRAGMA page_size = 1024;
  CREATE TABLE t1(a, b, c);
  CREATE TABLE t2(x, y, z);
}

do_malloc_test mallocE-1 -sqlprep $PREP -sqlbody { 
  SELECT p, q FROM (SELECT a+b AS p, b+c AS q FROM t1, t2 WHERE c>5)
              LEFT JOIN t2 ON p=x;
}

finish_test