SQLite

  /* Get a NULL terminated version of the new table name. */
  zName = sqlite3NameFromToken(db, pName);
  if( !zName ) goto exit_rename_table;

  /* Check that a table or index named 'zName' does not already exist
  ** in database iDb. If so, this is an error.
  */
  if( sqlite3FindTable(db, zName, zDb)
   || sqlite3FindIndex(db, zName, zDb)
   || sqlite3IsShadowTableOf(db, pTab, zName)
  ){
    sqlite3ErrorMsg(pParse, 
        "there is already another table or index with this name: %s", zName);
    goto exit_rename_table;
  }

  /* Make sure it is not a system table being altered, or a reserved name
  ** that the table is being renamed to.

    }
  }
  assert( pPk->nColumn==j );
  assert( pTab->nNVCol<=j );
  recomputeColumnsNotIndexed(pPk);
}


#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Return true if pTab is a virtual table and zName is a shadow table name
** for that virtual table.
*/
int sqlite3IsShadowTableOf(sqlite3 *db, Table *pTab, const char *zName){
  int nName;                    /* Length of zName */
  Module *pMod;                 /* Module for the virtual table */

  if( !IsVirtual(pTab) ) return 0;
  nName = sqlite3Strlen30(pTab->zName);
  if( sqlite3_strnicmp(zName, pTab->zName, nName)!=0 ) return 0;
  if( zName[nName]!='_' ) return 0;
  pMod = (Module*)sqlite3HashFind(&db->aModule, pTab->azModuleArg[0]);
  if( pMod==0 ) return 0;
  if( pMod->pModule->iVersion<3 ) return 0;
  if( pMod->pModule->xShadowName==0 ) return 0;
  return pMod->pModule->xShadowName(zName+nName+1);
}
#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */

#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Return true if zName is a shadow table name in the current database
** connection.
**
** zName is temporarily modified while this routine is running, but is
** restored to its original value prior to this routine returning.
*/
int sqlite3ShadowTableName(sqlite3 *db, const char *zName){
  char *zTail;                  /* Pointer to the last "_" in zName */
  Table *pTab;                  /* Table that zName is a shadow of */


  zTail = strrchr(zName, '_');
  if( zTail==0 ) return 0;
  *zTail = 0;
  pTab = sqlite3FindTable(db, zName, 0);
  *zTail = '_';
  if( pTab==0 ) return 0;
  if( !IsVirtual(pTab) ) return 0;

  return sqlite3IsShadowTableOf(db, pTab, zName);



}
#endif /* ifndef SQLITE_OMIT_VIRTUALTABLE */


#ifdef SQLITE_DEBUG
/*
** Mark all nodes of an expression as EP_Immutable, indicating that
** they should not be changed.  Expressions attached to a table or
** index definition are tagged this way to help ensure that we do
** not pass them into code generator routines by mistake.

     void(*)(void*)
   );
#  define sqlite3VtabInSync(db) ((db)->nVTrans>0 && (db)->aVTrans==0)
#endif
int sqlite3ReadOnlyShadowTables(sqlite3 *db);
#ifndef SQLITE_OMIT_VIRTUALTABLE
  int sqlite3ShadowTableName(sqlite3 *db, const char *zName);
  int sqlite3IsShadowTableOf(sqlite3*,Table*,const char*);
#else
# define sqlite3ShadowTableName(A,B) 0
# define sqlite3IsShadowTableOf(A,B,C) 0
#endif
int sqlite3VtabEponymousTableInit(Parse*,Module*);
void sqlite3VtabEponymousTableClear(sqlite3*,Module*);
void sqlite3VtabMakeWritable(Parse*,Table*);
void sqlite3VtabBeginParse(Parse*, Token*, Token*, Token*, int);
void sqlite3VtabFinishParse(Parse*, Token*);
void sqlite3VtabArgInit(Parse*);