diff -r 87e863f6f840 -r 3903521a36da engine/sqlite/src/analyze.cpp
--- a/engine/sqlite/src/analyze.cpp	Wed May 26 10:44:32 2010 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,420 +0,0 @@
-/*
-** 2005 July 8
-**
-** 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 file contains code associated with the ANALYZE command.
-**
-** @(#) $Id: analyze.cpp 1282 2008-11-13 09:31:33Z LarsPson $
-*/
-#ifndef SQLITE_OMIT_ANALYZE
-#include "sqliteInt.h"
-
-/*
-** This routine generates code that opens the sqlite_stat1 table on cursor
-** iStatCur.
-**
-** If the sqlite_stat1 tables does not previously exist, it is created.
-** If it does previously exist, all entires associated with table zWhere
-** are removed.  If zWhere==0 then all entries are removed.
-*/
-static void openStatTable(
-  Parse *pParse,          /* Parsing context */
-  int iDb,                /* The database we are looking in */
-  int iStatCur,           /* Open the sqlite_stat1 table on this cursor */
-  const char *zWhere      /* Delete entries associated with this table */
-){
-  sqlite3 *db = pParse->db;
-  Db *pDb;
-  int iRootPage;
-  Table *pStat;
-  Vdbe *v = sqlite3GetVdbe(pParse);
-
-  if( v==0 ) return;
-  assert( sqlite3BtreeHoldsAllMutexes(db) );
-  assert( sqlite3VdbeDb(v)==db );
-  pDb = &db->aDb[iDb];
-  if( (pStat = sqlite3FindTable(db, "sqlite_stat1", pDb->zName))==0 ){
-    /* The sqlite_stat1 tables does not exist.  Create it.  
-    ** Note that a side-effect of the CREATE TABLE statement is to leave
-    ** the rootpage of the new table on the top of the stack.  This is
-    ** important because the OpenWrite opcode below will be needing it. */
-    sqlite3NestedParse(pParse,
-      "CREATE TABLE %Q.sqlite_stat1(tbl,idx,stat)",
-      pDb->zName
-    );
-    iRootPage = 0;  /* Cause rootpage to be taken from top of stack */
-  }else if( zWhere ){
-    /* The sqlite_stat1 table exists.  Delete all entries associated with
-    ** the table zWhere. */
-    sqlite3NestedParse(pParse,
-       "DELETE FROM %Q.sqlite_stat1 WHERE tbl=%Q",
-       pDb->zName, zWhere
-    );
-    iRootPage = pStat->tnum;
-  }else{
-    /* The sqlite_stat1 table already exists.  Delete all rows. */
-    iRootPage = pStat->tnum;
-    sqlite3VdbeAddOp(v, OP_Clear, pStat->tnum, iDb);
-  }
-
-  /* Open the sqlite_stat1 table for writing. Unless it was created
-  ** by this vdbe program, lock it for writing at the shared-cache level. 
-  ** If this vdbe did create the sqlite_stat1 table, then it must have 
-  ** already obtained a schema-lock, making the write-lock redundant.
-  */
-  if( iRootPage>0 ){
-    sqlite3TableLock(pParse, iDb, iRootPage, 1, "sqlite_stat1");
-  }
-  sqlite3VdbeAddOp(v, OP_Integer, iDb, 0);
-  sqlite3VdbeAddOp(v, OP_OpenWrite, iStatCur, iRootPage);
-  sqlite3VdbeAddOp(v, OP_SetNumColumns, iStatCur, 3);
-}
-
-/*
-** Generate code to do an analysis of all indices associated with
-** a single table.
-*/
-static void analyzeOneTable(
-  Parse *pParse,   /* Parser context */
-  Table *pTab,     /* Table whose indices are to be analyzed */
-  int iStatCur,    /* Cursor that writes to the sqlite_stat1 table */
-  int iMem         /* Available memory locations begin here */
-){
-  Index *pIdx;     /* An index to being analyzed */
-  int iIdxCur;     /* Cursor number for index being analyzed */
-  int nCol;        /* Number of columns in the index */
-  Vdbe *v;         /* The virtual machine being built up */
-  int i;           /* Loop counter */
-  int topOfLoop;   /* The top of the loop */
-  int endOfLoop;   /* The end of the loop */
-  int addr;        /* The address of an instruction */
-  int iDb;         /* Index of database containing pTab */
-
-  v = sqlite3GetVdbe(pParse);
-  if( v==0 || pTab==0 || pTab->pIndex==0 ){
-    /* Do no analysis for tables that have no indices */
-    return;
-  }
-  assert( sqlite3BtreeHoldsAllMutexes(pParse->db) );
-  iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
-  assert( iDb>=0 );
-#ifndef SQLITE_OMIT_AUTHORIZATION
-  if( sqlite3AuthCheck(pParse, SQLITE_ANALYZE, pTab->zName, 0,
-      pParse->db->aDb[iDb].zName ) ){
-    return;
-  }
-#endif
-
-  /* Establish a read-lock on the table at the shared-cache level. */
-  sqlite3TableLock(pParse, iDb, pTab->tnum, 0, pTab->zName);
-
-  iIdxCur = pParse->nTab;
-  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-    KeyInfo *pKey = sqlite3IndexKeyinfo(pParse, pIdx);
-
-    /* Open a cursor to the index to be analyzed
-    */
-    assert( iDb==sqlite3SchemaToIndex(pParse->db, pIdx->pSchema) );
-    sqlite3VdbeAddOp(v, OP_Integer, iDb, 0);
-    VdbeComment((v, "# %s", pIdx->zName));
-    sqlite3VdbeOp3(v, OP_OpenRead, iIdxCur, pIdx->tnum,
-        (char *)pKey, P3_KEYINFO_HANDOFF);
-    nCol = pIdx->nColumn;
-    if( iMem+nCol*2>=pParse->nMem ){
-      pParse->nMem = iMem+nCol*2+1;
-    }
-    sqlite3VdbeAddOp(v, OP_SetNumColumns, iIdxCur, nCol+1);
-
-    /* Memory cells are used as follows:
-    **
-    **    mem[iMem]:             The total number of rows in the table.
-    **    mem[iMem+1]:           Number of distinct values in column 1
-    **    ...
-    **    mem[iMem+nCol]:        Number of distinct values in column N
-    **    mem[iMem+nCol+1]       Last observed value of column 1
-    **    ...
-    **    mem[iMem+nCol+nCol]:   Last observed value of column N
-    **
-    ** Cells iMem through iMem+nCol are initialized to 0.  The others
-    ** are initialized to NULL.
-    */
-    for(i=0; i<=nCol; i++){
-      sqlite3VdbeAddOp(v, OP_MemInt, 0, iMem+i);
-    }
-    for(i=0; i<nCol; i++){
-      sqlite3VdbeAddOp(v, OP_MemNull, iMem+nCol+i+1, 0);
-    }
-
-    /* Do the analysis.
-    */
-    endOfLoop = sqlite3VdbeMakeLabel(v);
-    sqlite3VdbeAddOp(v, OP_Rewind, iIdxCur, endOfLoop);
-    topOfLoop = sqlite3VdbeCurrentAddr(v);
-    sqlite3VdbeAddOp(v, OP_MemIncr, 1, iMem);
-    for(i=0; i<nCol; i++){
-      sqlite3VdbeAddOp(v, OP_Column, iIdxCur, i);
-      sqlite3VdbeAddOp(v, OP_MemLoad, iMem+nCol+i+1, 0);
-      sqlite3VdbeAddOp(v, OP_Ne, 0x100, 0);
-    }
-    sqlite3VdbeAddOp(v, OP_Goto, 0, endOfLoop);
-    for(i=0; i<nCol; i++){
-      addr = sqlite3VdbeAddOp(v, OP_MemIncr, 1, iMem+i+1);
-      sqlite3VdbeChangeP2(v, topOfLoop + 3*i + 3, addr);
-      sqlite3VdbeAddOp(v, OP_Column, iIdxCur, i);
-      sqlite3VdbeAddOp(v, OP_MemStore, iMem+nCol+i+1, 1);
-    }
-    sqlite3VdbeResolveLabel(v, endOfLoop);
-    sqlite3VdbeAddOp(v, OP_Next, iIdxCur, topOfLoop);
-    sqlite3VdbeAddOp(v, OP_Close, iIdxCur, 0);
-
-    /* Store the results.  
-    **
-    ** The result is a single row of the sqlite_stat1 table.  The first
-    ** two columns are the names of the table and index.  The third column
-    ** is a string composed of a list of integer statistics about the
-    ** index.  The first integer in the list is the total number of entires
-    ** in the index.  There is one additional integer in the list for each
-    ** column of the table.  This additional integer is a guess of how many
-    ** rows of the table the index will select.  If D is the count of distinct
-    ** values and K is the total number of rows, then the integer is computed
-    ** as:
-    **
-    **        I = (K+D-1)/D
-    **
-    ** If K==0 then no entry is made into the sqlite_stat1 table.  
-    ** If K>0 then it is always the case the D>0 so division by zero
-    ** is never possible.
-    */
-    sqlite3VdbeAddOp(v, OP_MemLoad, iMem, 0);
-    addr = sqlite3VdbeAddOp(v, OP_IfNot, 0, 0);
-    sqlite3VdbeAddOp(v, OP_NewRowid, iStatCur, 0);
-    sqlite3VdbeOp3(v, OP_String8, 0, 0, pTab->zName, 0);
-    sqlite3VdbeOp3(v, OP_String8, 0, 0, pIdx->zName, 0);
-    sqlite3VdbeAddOp(v, OP_MemLoad, iMem, 0);
-    sqlite3VdbeOp3(v, OP_String8, 0, 0, " ", 0);
-    for(i=0; i<nCol; i++){
-      sqlite3VdbeAddOp(v, OP_MemLoad, iMem, 0);
-      sqlite3VdbeAddOp(v, OP_MemLoad, iMem+i+1, 0);
-      sqlite3VdbeAddOp(v, OP_Add, 0, 0);
-      sqlite3VdbeAddOp(v, OP_AddImm, -1, 0);
-      sqlite3VdbeAddOp(v, OP_MemLoad, iMem+i+1, 0);
-      sqlite3VdbeAddOp(v, OP_Divide, 0, 0);
-      sqlite3VdbeAddOp(v, OP_ToInt, 0, 0);
-      if( i==nCol-1 ){
-        sqlite3VdbeAddOp(v, OP_Concat, nCol*2-1, 0);
-      }else{
-        sqlite3VdbeAddOp(v, OP_Dup, 1, 0);
-      }
-    }
-    sqlite3VdbeOp3(v, OP_MakeRecord, 3, 0, "aaa", 0);
-    sqlite3VdbeAddOp(v, OP_Insert, iStatCur, OPFLAG_APPEND);
-    sqlite3VdbeJumpHere(v, addr);
-  }
-}
-
-/*
-** Generate code that will cause the most recent index analysis to
-** be laoded into internal hash tables where is can be used.
-*/
-static void loadAnalysis(Parse *pParse, int iDb){
-  Vdbe *v = sqlite3GetVdbe(pParse);
-  if( v ){
-    sqlite3VdbeAddOp(v, OP_LoadAnalysis, iDb, 0);
-  }
-}
-
-/*
-** Generate code that will do an analysis of an entire database
-*/
-static void analyzeDatabase(Parse *pParse, int iDb){
-  sqlite3 *db = pParse->db;
-  Schema *pSchema = db->aDb[iDb].pSchema;    /* Schema of database iDb */
-  HashElem *k;
-  int iStatCur;
-  int iMem;
-
-  sqlite3BeginWriteOperation(pParse, 0, iDb);
-  iStatCur = pParse->nTab++;
-  openStatTable(pParse, iDb, iStatCur, 0);
-  iMem = pParse->nMem;
-  for(k=sqliteHashFirst(&pSchema->tblHash); k; k=sqliteHashNext(k)){
-    Table *pTab = (Table*)sqliteHashData(k);
-    analyzeOneTable(pParse, pTab, iStatCur, iMem);
-  }
-  loadAnalysis(pParse, iDb);
-}
-
-/*
-** Generate code that will do an analysis of a single table in
-** a database.
-*/
-static void analyzeTable(Parse *pParse, Table *pTab){
-  int iDb;
-  int iStatCur;
-
-  assert( pTab!=0 );
-  assert( sqlite3BtreeHoldsAllMutexes(pParse->db) );
-  iDb = sqlite3SchemaToIndex(pParse->db, pTab->pSchema);
-  sqlite3BeginWriteOperation(pParse, 0, iDb);
-  iStatCur = pParse->nTab++;
-  openStatTable(pParse, iDb, iStatCur, pTab->zName);
-  analyzeOneTable(pParse, pTab, iStatCur, pParse->nMem);
-  loadAnalysis(pParse, iDb);
-}
-
-/*
-** Generate code for the ANALYZE command.  The parser calls this routine
-** when it recognizes an ANALYZE command.
-**
-**        ANALYZE                            -- 1
-**        ANALYZE  <database>                -- 2
-**        ANALYZE  ?<database>.?<tablename>  -- 3
-**
-** Form 1 causes all indices in all attached databases to be analyzed.
-** Form 2 analyzes all indices the single database named.
-** Form 3 analyzes all indices associated with the named table.
-*/
-void sqlite3Analyze(Parse *pParse, Token *pName1, Token *pName2){
-  sqlite3 *db = pParse->db;
-  int iDb;
-  int i;
-  char *z, *zDb;
-  Table *pTab;
-  Token *pTableName;
-
-  /* Read the database schema. If an error occurs, leave an error message
-  ** and code in pParse and return NULL. */
-  assert( sqlite3BtreeHoldsAllMutexes(pParse->db) );
-  if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
-    return;
-  }
-
-  if( pName1==0 ){
-    /* Form 1:  Analyze everything */
-    for(i=0; i<db->nDb; i++){
-      if( i==1 ) continue;  /* Do not analyze the TEMP database */
-      analyzeDatabase(pParse, i);
-    }
-  }else if( pName2==0 || pName2->n==0 ){
-    /* Form 2:  Analyze the database or table named */
-    iDb = sqlite3FindDb(db, pName1);
-    if( iDb>=0 ){
-      analyzeDatabase(pParse, iDb);
-    }else{
-      z = sqlite3NameFromToken(db, pName1);
-      if( z ){
-        pTab = sqlite3LocateTable(pParse, z, 0);
-        sqlite3_free(z);
-        if( pTab ){
-          analyzeTable(pParse, pTab);
-        }
-      }
-    }
-  }else{
-    /* Form 3: Analyze the fully qualified table name */
-    iDb = sqlite3TwoPartName(pParse, pName1, pName2, &pTableName);
-    if( iDb>=0 ){
-      zDb = db->aDb[iDb].zName;
-      z = sqlite3NameFromToken(db, pTableName);
-      if( z ){
-        pTab = sqlite3LocateTable(pParse, z, zDb);
-        sqlite3_free(z);
-        if( pTab ){
-          analyzeTable(pParse, pTab);
-        }
-      }
-    }   
-  }
-}
-
-/*
-** Used to pass information from the analyzer reader through to the
-** callback routine.
-*/
-typedef struct analysisInfo analysisInfo;
-struct analysisInfo {
-  sqlite3 *db;
-  const char *zDatabase;
-};
-
-/*
-** This callback is invoked once for each index when reading the
-** sqlite_stat1 table.  
-**
-**     argv[0] = name of the index
-**     argv[1] = results of analysis - on integer for each column
-*/
-static int analysisLoader(void *pData, int argc, char **argv, char **azNotUsed){
-  analysisInfo *pInfo = (analysisInfo*)pData;
-  Index *pIndex;
-  int i, c;
-  unsigned int v;
-  const char *z;
-
-  assert( argc==2 );
-  if( argv==0 || argv[0]==0 || argv[1]==0 ){
-    return 0;
-  }
-  pIndex = sqlite3FindIndex(pInfo->db, argv[0], pInfo->zDatabase);
-  if( pIndex==0 ){
-    return 0;
-  }
-  z = argv[1];
-  for(i=0; *z && i<=pIndex->nColumn; i++){
-    v = 0;
-    while( (c=z[0])>='0' && c<='9' ){
-      v = v*10 + c - '0';
-      z++;
-    }
-    pIndex->aiRowEst[i] = v;
-    if( *z==' ' ) z++;
-  }
-  return 0;
-}
-
-/*
-** Load the content of the sqlite_stat1 table into the index hash tables.
-*/
-int sqlite3AnalysisLoad(sqlite3 *db, int iDb){
-  analysisInfo sInfo;
-  HashElem *i;
-  char *zSql;
-  int rc;
-
-  assert( iDb>=0 && iDb<db->nDb );
-  assert( db->aDb[iDb].pBt!=0 );
-  assert( sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );
-
-  /* Clear any prior statistics */
-  for(i=sqliteHashFirst(&db->aDb[iDb].pSchema->idxHash);i;i=sqliteHashNext(i)){
-    Index *pIdx = (Index *)sqliteHashData(i);
-    sqlite3DefaultRowEst(pIdx);
-  }
-
-  /* Check to make sure the sqlite_stat1 table existss */
-  sInfo.db = db;
-  sInfo.zDatabase = db->aDb[iDb].zName;
-  if( sqlite3FindTable(db, "sqlite_stat1", sInfo.zDatabase)==0 ){
-     return SQLITE_ERROR;
-  }
-
-
-  /* Load new statistics out of the sqlite_stat1 table */
-  zSql = sqlite3MPrintf(db, "SELECT idx, stat FROM %Q.sqlite_stat1",
-                        sInfo.zDatabase);
-  sqlite3SafetyOff(db);
-  rc = sqlite3_exec(db, zSql, analysisLoader, &sInfo, 0);
-  sqlite3SafetyOn(db);
-  sqlite3_free(zSql);
-  return rc;
-}
-
-
-#endif /* SQLITE_OMIT_ANALYZE */