**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.149 2003/04/22 20:30:38 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Check to see if the schema for the database needs
................................................................................
    if( *pz==0 ){
      sqliteSrcListDelete(pList);
      return 0;
    }else{
      sqliteDequote(*pz);
    }
  }

  pList->nSrc++;
  return pList;
}













/*
** Add an alias to the last identifier on the given identifier list.
*/
void sqliteSrcListAddAlias(SrcList *pList, Token *pToken){
  if( pList && pList->nSrc>0 ){
    int i = pList->nSrc - 1;

**     DROP INDEX
**     creating ID lists
**     BEGIN TRANSACTION
**     COMMIT
**     ROLLBACK
**     PRAGMA
**
** $Id: build.c,v 1.150 2003/04/29 16:20:45 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** This routine is called when a new SQL statement is beginning to
** be parsed.  Check to see if the schema for the database needs
................................................................................
    if( *pz==0 ){
      sqliteSrcListDelete(pList);
      return 0;
    }else{
      sqliteDequote(*pz);
    }
  }
  pList->a[pList->nSrc].iCursor = -1;
  pList->nSrc++;
  return pList;
}

/*
** Assign cursors to all tables in a SrcList
*/
void sqliteSrcListAssignCursors(Parse *pParse, SrcList *pList){
  int i;
  for(i=0; i<pList->nSrc; i++){
    if( pList->a[i].iCursor<0 ){
      pList->a[i].iCursor = ++pParse->nTab;
    }
  }
}

/*
** Add an alias to the last identifier on the given identifier list.
*/
void sqliteSrcListAddAlias(SrcList *pList, Token *pToken){
  if( pList && pList->nSrc>0 ){
    int i = pList->nSrc - 1;

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.128 2003/04/26 02:31:54 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information
................................................................................
      case ';': {
        isComplete = 1;
        seenText = 1;
        seenCreate = 0;
        break;
      }
      case ' ':

      case '\t':
      case '\n':
      case '\f': {
        break;
      }
      case '[': {
        isComplete = 0;

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.129 2003/04/29 16:20:46 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>

/*
** A pointer to this structure is used to communicate information
................................................................................
      case ';': {
        isComplete = 1;
        seenText = 1;
        seenCreate = 0;
        break;
      }
      case ' ':
      case '\r':
      case '\t':
      case '\n':
      case '\f': {
        break;
      }
      case '[': {
        isComplete = 0;

**    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 1.134 2003/04/24 01:45:04 drh Exp $
*/
#include "sqliteInt.h"


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

/*
** For the given SELECT statement, do three things.
**
**    (1)  Fill in the pTabList->a[].pTab fields in the SrcList that 
**         defines the set of tables that should be scanned. 





**
**    (2)  Add terms to the WHERE clause to accomodate the NATURAL keyword
**         on joins and the ON and USING clause of joins.
**
**    (3)  Scan the list of columns in the result set (pEList) looking
**         for instances of the "*" operator or the TABLE.* operator.
**         If found, expand each "*" to be every column in every table
................................................................................
      /* An ordinary table or view name in the FROM clause */
      pTabList->a[i].pTab = pTab = 
        sqliteLocateTable(pParse,pTabList->a[i].zName,pTabList->a[i].zDatabase);
      if( pTab==0 ){
        return 1;
      }
      if( pTab->pSelect ){

        if( sqliteViewGetColumnNames(pParse, pTab) ){
          return 1;
        }





        sqliteSelectDelete(pTabList->a[i].pSelect);
        pTabList->a[i].pSelect = sqliteSelectDup(pTab->pSelect);

      }
    }
  }

  /* Process NATURAL keywords, and ON and USING clauses of joins.
  */
  if( sqliteProcessJoin(pParse, p) ) return 1;
................................................................................
  if( (pSub->isDistinct || pSub->nLimit>=0) &&  (pSrc->nSrc>1 || isAgg) ){
     return 0;
  }
  if( (p->isDistinct || p->nLimit>=0) && subqueryIsAgg ) return 0;
  if( p->pOrderBy && pSub->pOrderBy ) return 0;

  /* If we reach this point, it means flattening is permitted for the
  ** i-th entry of the FROM clause in the outer query.
  */
  iParent = p->base + iFrom;
  iSub = pSub->base;
  substExprList(p->pEList, iParent, pSub->pEList, iSub);
  pList = p->pEList;
  for(i=0; i<pList->nExpr; i++){
    Expr *pExpr;

**    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 1.135 2003/04/29 16:20:46 drh Exp $
*/
#include "sqliteInt.h"


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

/*
** For the given SELECT statement, do three things.
**
**    (1)  Fill in the pTabList->a[].pTab fields in the SrcList that 
**         defines the set of tables that should be scanned.  For views,
**         fill pTabList->a[].pSelect with a copy of the SELECT statement
**         that implements the view.  A copy is made of the view's SELECT
**         statement so that we can freely modify or delete that statement
**         without worrying about messing up the presistent representation
**         of the view.
**
**    (2)  Add terms to the WHERE clause to accomodate the NATURAL keyword
**         on joins and the ON and USING clause of joins.
**
**    (3)  Scan the list of columns in the result set (pEList) looking
**         for instances of the "*" operator or the TABLE.* operator.
**         If found, expand each "*" to be every column in every table
................................................................................
      /* An ordinary table or view name in the FROM clause */
      pTabList->a[i].pTab = pTab = 
        sqliteLocateTable(pParse,pTabList->a[i].zName,pTabList->a[i].zDatabase);
      if( pTab==0 ){
        return 1;
      }
      if( pTab->pSelect ){
        /* We reach here if the named table is a really a view */
        if( sqliteViewGetColumnNames(pParse, pTab) ){
          return 1;
        }
        /* If pTabList->a[i].pSelect!=0 it means we are dealing with a
        ** view within a view.  The SELECT structure has already been
        ** copied by the outer view so we can skip the copy step here
        ** in the inner view.
        */
        if( pTabList->a[i].pSelect==0 ){
          pTabList->a[i].pSelect = sqliteSelectDup(pTab->pSelect);
        }
      }
    }
  }

  /* Process NATURAL keywords, and ON and USING clauses of joins.
  */
  if( sqliteProcessJoin(pParse, p) ) return 1;
................................................................................
  if( (pSub->isDistinct || pSub->nLimit>=0) &&  (pSrc->nSrc>1 || isAgg) ){
     return 0;
  }
  if( (p->isDistinct || p->nLimit>=0) && subqueryIsAgg ) return 0;
  if( p->pOrderBy && pSub->pOrderBy ) return 0;

  /* If we reach this point, it means flattening is permitted for the
  ** iFrom-th entry of the FROM clause in the outer query.
  */
  iParent = p->base + iFrom;
  iSub = pSub->base;
  substExprList(p->pEList, iParent, pSub->pEList, iSub);
  pList = p->pEList;
  for(i=0; i<pList->nExpr; i++){
    Expr *pExpr;

**    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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.181 2003/04/25 17:52:11 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
................................................................................
  struct SrcList_item {
    char *zDatabase;  /* Name of database holding this table */
    char *zName;      /* Name of the table */
    char *zAlias;     /* The "B" part of a "A AS B" phrase.  zName is the "A" */
    Table *pTab;      /* An SQL table corresponding to zName */
    Select *pSelect;  /* A SELECT statement used in place of a table name */
    int jointype;     /* Type of join between this table and the next */

    Expr *pOn;        /* The ON clause of a join */
    IdList *pUsing;   /* The USING clause of a join */
  } a[1];             /* One entry for each identifier on the list */
};

/*
** Permitted values of the SrcList.a.jointype field

**    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.
**
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.182 2003/04/29 16:20:46 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
#include "hash.h"
#include "vdbe.h"
#include "parse.h"
#include "btree.h"
................................................................................
  struct SrcList_item {
    char *zDatabase;  /* Name of database holding this table */
    char *zName;      /* Name of the table */
    char *zAlias;     /* The "B" part of a "A AS B" phrase.  zName is the "A" */
    Table *pTab;      /* An SQL table corresponding to zName */
    Select *pSelect;  /* A SELECT statement used in place of a table name */
    int jointype;     /* Type of join between this table and the next */
    int iCursor;      /* The VDBE cursor number used to access this table */
    Expr *pOn;        /* The ON clause of a join */
    IdList *pUsing;   /* The USING clause of a join */
  } a[1];             /* One entry for each identifier on the list */
};

/*
** Permitted values of the SrcList.a.jointype field