# SQLite

series.c

## File ext/misc/series.c from the latest check-in

``````/*
** 2015-08-18, 2023-04-28
**
** 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 demonstrates how to create a table-valued-function using
** a virtual table.  This demo implements the generate_series() function
** which gives the same results as the eponymous function in PostgreSQL,
** within the limitation that its arguments are signed 64-bit integers.
**
** Considering its equivalents to generate_series(start,stop,step): A
** value V[n] sequence is produced for integer n ascending from 0 where
**  ( V[n] == start + n * step  &&  sgn(V[n] - stop) * sgn(step) >= 0 )
** for each produced value (independent of production time ordering.)
**
** All parameters must be either integer or convertable to integer.
** The start parameter is required.
** The stop parameter defaults to (1<<32)-1 (aka 4294967295 or 0xffffffff)
** The step parameter defaults to 1 and 0 is treated as 1.
**
** Examples:
**
**      SELECT * FROM generate_series(0,100,5);
**
** The query above returns integers from 0 through 100 counting by steps
** of 5.
**
**      SELECT * FROM generate_series(0,100);
**
** Integers from 0 through 100 with a step size of 1.
**
**      SELECT * FROM generate_series(20) LIMIT 10;
**
** Integers 20 through 29.
**
**      SELECT * FROM generate_series(0,-100,-5);
**
** Integers 0 -5 -10 ... -100.
**
**      SELECT * FROM generate_series(0,-1);
**
** Empty sequence.
**
** HOW IT WORKS
**
** The generate_series "function" is really a virtual table with the
** following schema:
**
**     CREATE TABLE generate_series(
**       value,
**       start HIDDEN,
**       stop HIDDEN,
**       step HIDDEN
**     );
**
** The virtual table also has a rowid, logically equivalent to n+1 where
** "n" is the ascending integer in the aforesaid production definition.
**
** Function arguments in queries against this virtual table are translated
** into equality constraints against successive hidden columns.  In other
** words, the following pairs of queries are equivalent to each other:
**
**    SELECT * FROM generate_series(0,100,5);
**    SELECT * FROM generate_series WHERE start=0 AND stop=100 AND step=5;
**
**    SELECT * FROM generate_series(0,100);
**    SELECT * FROM generate_series WHERE start=0 AND stop=100;
**
**    SELECT * FROM generate_series(20) LIMIT 10;
**    SELECT * FROM generate_series WHERE start=20 LIMIT 10;
**
** The generate_series virtual table implementation leaves the xCreate method
** set to NULL.  This means that it is not possible to do a CREATE VIRTUAL
** TABLE command with "generate_series" as the USING argument.  Instead, there
** is a single generate_series virtual table that is always available without
** having to be created first.
**
** The xBestIndex method looks for equality constraints against the hidden
** start, stop, and step columns, and if present, it uses those constraints
** to bound the sequence of generated values.  If the equality constraints
** are missing, it uses 0 for start, 4294967295 for stop, and 1 for step.
** xBestIndex returns a small cost when both start and stop are available,
** and a very large cost if either start or stop are unavailable.  This
** encourages the query planner to order joins such that the bounds of the
** series are well-defined.
**
** Update on 2024-08-22:
** xBestIndex now also looks for equality and inequality constraints against
** the value column and uses those constraints as additional bounds against
** the sequence range.  Thus, a query like this:
**
**     SELECT value FROM generate_series(\$SA,\$EA)
**      WHERE value BETWEEN \$SB AND \$EB;
**
** Is logically the same as:
**
**     SELECT value FROM generate_series(max(\$SA,\$SB),min(\$EA,\$EB));
**
** Constraints on the value column can server as substitutes for constraints
** on the hidden start and stop columns.  So, the following two queries
** are equivalent:
**
**     SELECT value FROM generate_series(\$S,\$E);
**     SELECT value FROM generate_series WHERE value BETWEEN \$S and \$E;
**
*/
#include "sqlite3ext.h"
SQLITE_EXTENSION_INIT1
#include <assert.h>
#include <string.h>
#include <limits.h>

#ifndef SQLITE_OMIT_VIRTUALTABLE
/*
** Return that member of a generate_series(...) sequence whose 0-based
** index is ix. The 0th member is given by smBase. The sequence members
** progress per ix increment by smStep.
*/
static sqlite3_int64 genSeqMember(
sqlite3_int64 smBase,
sqlite3_int64 smStep,
sqlite3_uint64 ix
){
static const sqlite3_uint64 mxI64 =
((sqlite3_uint64)0x7fffffff)<<32 | 0xffffffff;
if( ix>=mxI64 ){
/* Get ix into signed i64 range. */
ix -= mxI64;
/* With 2's complement ALU, this next can be 1 step, but is split into
* 2 for UBSAN's satisfaction (and hypothetical 1's complement ALUs.) */
smBase += (mxI64/2) * smStep;
smBase += (mxI64 - mxI64/2) * smStep;
}
/* Under UBSAN (or on 1's complement machines), must do this last term
* in steps to avoid the dreaded (and harmless) signed multiply overlow. */
if( ix>=2 ){
sqlite3_int64 ix2 = (sqlite3_int64)ix/2;
smBase += ix2*smStep;
ix -= ix2;
}
return smBase + ((sqlite3_int64)ix)*smStep;
}

typedef unsigned char u8;

typedef struct SequenceSpec {
sqlite3_int64 iOBase;        /* Original starting value ("start") */
sqlite3_int64 iOTerm;        /* Original terminal value ("stop") */
sqlite3_int64 iBase;         /* Starting value to actually use */
sqlite3_int64 iTerm;         /* Terminal value to actually use */
sqlite3_int64 iStep;         /* Increment ("step") */
sqlite3_uint64 uSeqIndexMax; /* maximum sequence index (aka "n") */
sqlite3_uint64 uSeqIndexNow; /* Current index during generation */
sqlite3_int64 iValueNow;     /* Current value during generation */
u8 isNotEOF;                 /* Sequence generation not exhausted */
u8 isReversing;              /* Sequence is being reverse generated */
} SequenceSpec;

/*
** Prepare a SequenceSpec for use in generating an integer series
** given initialized iBase, iTerm and iStep values. Sequence is
** initialized per given isReversing. Other members are computed.
*/
static void setupSequence( SequenceSpec *pss ){
int bSameSigns;
pss->uSeqIndexMax = 0;
pss->isNotEOF = 0;
bSameSigns = (pss->iBase < 0)==(pss->iTerm < 0);
if( pss->iTerm < pss->iBase ){
sqlite3_uint64 nuspan = 0;
if( bSameSigns ){
nuspan = (sqlite3_uint64)(pss->iBase - pss->iTerm);
}else{
/* Under UBSAN (or on 1's complement machines), must do this in steps.
* In this clause, iBase>=0 and iTerm<0 . */
nuspan = 1;
nuspan += pss->iBase;
nuspan += -(pss->iTerm+1);
}
if( pss->iStep<0 ){
pss->isNotEOF = 1;
if( nuspan==ULONG_MAX ){
pss->uSeqIndexMax = ( pss->iStep>LLONG_MIN )? nuspan/-pss->iStep : 1;
}else if( pss->iStep>LLONG_MIN ){
pss->uSeqIndexMax = nuspan/-pss->iStep;
}
}
}else if( pss->iTerm > pss->iBase ){
sqlite3_uint64 puspan = 0;
if( bSameSigns ){
puspan = (sqlite3_uint64)(pss->iTerm - pss->iBase);
}else{
/* Under UBSAN (or on 1's complement machines), must do this in steps.
* In this clause, iTerm>=0 and iBase<0 . */
puspan = 1;
puspan += pss->iTerm;
puspan += -(pss->iBase+1);
}
if( pss->iStep>0 ){
pss->isNotEOF = 1;
pss->uSeqIndexMax = puspan/pss->iStep;
}
}else if( pss->iTerm == pss->iBase ){
pss->isNotEOF = 1;
pss->uSeqIndexMax = 0;
}
pss->uSeqIndexNow = (pss->isReversing)? pss->uSeqIndexMax : 0;
pss->iValueNow = (pss->isReversing)
? genSeqMember(pss->iBase, pss->iStep, pss->uSeqIndexMax)
: pss->iBase;
}

/*
** Progress sequence generator to yield next value, if any.
** Leave its state to either yield next value or be at EOF.
** Return whether there is a next value, or 0 at EOF.
*/
static int progressSequence( SequenceSpec *pss ){
if( !pss->isNotEOF ) return 0;
if( pss->isReversing ){
if( pss->uSeqIndexNow > 0 ){
pss->uSeqIndexNow--;
pss->iValueNow -= pss->iStep;
}else{
pss->isNotEOF = 0;
}
}else{
if( pss->uSeqIndexNow < pss->uSeqIndexMax ){
pss->uSeqIndexNow++;
pss->iValueNow += pss->iStep;
}else{
pss->isNotEOF = 0;
}
}
return pss->isNotEOF;
}

/* series_cursor is a subclass of sqlite3_vtab_cursor which will
** serve as the underlying representation of a cursor that scans
** over rows of the result
*/
typedef struct series_cursor series_cursor;
struct series_cursor {
sqlite3_vtab_cursor base;  /* Base class - must be first */
SequenceSpec ss;           /* (this) Derived class data */
};

/*
** The seriesConnect() method is invoked to create a new
** series_vtab that describes the generate_series virtual table.
**
** Think of this routine as the constructor for series_vtab objects.
**
** All this routine needs to do is:
**
**    (1) Allocate the series_vtab object and initialize all fields.
**
**    (2) Tell SQLite (via the sqlite3_declare_vtab() interface) what the
**        result set of queries against generate_series will look like.
*/
static int seriesConnect(
sqlite3 *db,
void *pUnused,
int argcUnused, const char *const*argvUnused,
sqlite3_vtab **ppVtab,
char **pzErrUnused
){
sqlite3_vtab *pNew;
int rc;

/* Column numbers */
#define SERIES_COLUMN_VALUE 0
#define SERIES_COLUMN_START 1
#define SERIES_COLUMN_STOP  2
#define SERIES_COLUMN_STEP  3

(void)pUnused;
(void)argcUnused;
(void)argvUnused;
(void)pzErrUnused;
rc = sqlite3_declare_vtab(db,
"CREATE TABLE x(value,start hidden,stop hidden,step hidden)");
if( rc==SQLITE_OK ){
pNew = *ppVtab = sqlite3_malloc( sizeof(*pNew) );
if( pNew==0 ) return SQLITE_NOMEM;
memset(pNew, 0, sizeof(*pNew));
sqlite3_vtab_config(db, SQLITE_VTAB_INNOCUOUS);
}
return rc;
}

/*
** This method is the destructor for series_cursor objects.
*/
static int seriesDisconnect(sqlite3_vtab *pVtab){
sqlite3_free(pVtab);
return SQLITE_OK;
}

/*
** Constructor for a new series_cursor object.
*/
static int seriesOpen(sqlite3_vtab *pUnused, sqlite3_vtab_cursor **ppCursor){
series_cursor *pCur;
(void)pUnused;
pCur = sqlite3_malloc( sizeof(*pCur) );
if( pCur==0 ) return SQLITE_NOMEM;
memset(pCur, 0, sizeof(*pCur));
*ppCursor = &pCur->base;
return SQLITE_OK;
}

/*
** Destructor for a series_cursor.
*/
static int seriesClose(sqlite3_vtab_cursor *cur){
sqlite3_free(cur);
return SQLITE_OK;
}

/*
** Advance a series_cursor to its next row of output.
*/
static int seriesNext(sqlite3_vtab_cursor *cur){
series_cursor *pCur = (series_cursor*)cur;
progressSequence( & pCur->ss );
return SQLITE_OK;
}

/*
** Return values of columns for the row at which the series_cursor
** is currently pointing.
*/
static int seriesColumn(
sqlite3_vtab_cursor *cur,   /* The cursor */
sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
int i                       /* Which column to return */
){
series_cursor *pCur = (series_cursor*)cur;
sqlite3_int64 x = 0;
switch( i ){
case SERIES_COLUMN_START:  x = pCur->ss.iOBase;     break;
case SERIES_COLUMN_STOP:   x = pCur->ss.iOTerm;     break;
case SERIES_COLUMN_STEP:   x = pCur->ss.iStep;      break;
default:                   x = pCur->ss.iValueNow;  break;
}
sqlite3_result_int64(ctx, x);
return SQLITE_OK;
}

#ifndef LARGEST_UINT64
#define LARGEST_INT64  (0xffffffff|(((sqlite3_int64)0x7fffffff)<<32))
#define LARGEST_UINT64 (0xffffffff|(((sqlite3_uint64)0xffffffff)<<32))
#define SMALLEST_INT64 (((sqlite3_int64)-1) - LARGEST_INT64)
#endif

/*
** Return the rowid for the current row, logically equivalent to n+1 where
** "n" is the ascending integer in the aforesaid production definition.
*/
static int seriesRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
series_cursor *pCur = (series_cursor*)cur;
sqlite3_uint64 n = pCur->ss.uSeqIndexNow;
*pRowid = (sqlite3_int64)((n<LARGEST_UINT64)? n+1 : 0);
return SQLITE_OK;
}

/*
** Return TRUE if the cursor has been moved off of the last
** row of output.
*/
static int seriesEof(sqlite3_vtab_cursor *cur){
series_cursor *pCur = (series_cursor*)cur;
return !pCur->ss.isNotEOF;
}

/* True to cause run-time checking of the start=, stop=, and/or step=
** parameters.  The only reason to do this is for testing the
** constraint checking logic for virtual tables in the SQLite core.
*/
#ifndef SQLITE_SERIES_CONSTRAINT_VERIFY
# define SQLITE_SERIES_CONSTRAINT_VERIFY 0
#endif

/*
** This method is called to "rewind" the series_cursor object back
** to the first row of output.  This method is always called at least
** once prior to any call to seriesColumn() or seriesRowid() or
** seriesEof().
**
** The query plan selected by seriesBestIndex is passed in the idxNum
** parameter.  (idxStr is not used in this implementation.)  idxNum
** is a bitmask showing which constraints are available:
**
**   0x0001:    start=VALUE
**   0x0002:    stop=VALUE
**   0x0004:    step=VALUE
**   0x0008:    descending order
**   0x0010:    ascending order
**   0x0020:    LIMIT  VALUE
**   0x0040:    OFFSET  VALUE
**   0x0080:    value=VALUE
**   0x0100:    value>=VALUE
**   0x0200:    value>VALUE
**   0x1000:    value<=VALUE
**   0x2000:    value<VALUE
**
** This routine should initialize the cursor and position it so that it
** is pointing at the first row, or pointing off the end of the table
** (so that seriesEof() will return true) if the table is empty.
*/
static int seriesFilter(
sqlite3_vtab_cursor *pVtabCursor,
int idxNum, const char *idxStrUnused,
int argc, sqlite3_value **argv
){
series_cursor *pCur = (series_cursor *)pVtabCursor;
int i = 0;
int returnNoRows = 0;
sqlite3_int64 iMin = SMALLEST_INT64;
sqlite3_int64 iMax = LARGEST_INT64;
sqlite3_int64 iLimit = 0;
sqlite3_int64 iOffset = 0;

(void)idxStrUnused;
if( idxNum & 0x01 ){
pCur->ss.iBase = sqlite3_value_int64(argv[i++]);
}else{
pCur->ss.iBase = 0;
}
if( idxNum & 0x02 ){
pCur->ss.iTerm = sqlite3_value_int64(argv[i++]);
}else{
pCur->ss.iTerm = 0xffffffff;
}
if( idxNum & 0x04 ){
pCur->ss.iStep = sqlite3_value_int64(argv[i++]);
if( pCur->ss.iStep==0 ){
pCur->ss.iStep = 1;
}else if( pCur->ss.iStep<0 ){
if( (idxNum & 0x10)==0 ) idxNum |= 0x08;
}
}else{
pCur->ss.iStep = 1;
}

/* If there are constraints on the value column but there are
** no constraints on  the start, stop, and step columns, then
** initialize the default range to be the entire range of 64-bit signed
** integers.  This range will contracted by the value column constraints
** further below.
*/
if( (idxNum & 0x05)==0 && (idxNum & 0x0380)!=0 ){
pCur->ss.iBase = SMALLEST_INT64;
}
if( (idxNum & 0x06)==0 && (idxNum & 0x3080)!=0 ){
pCur->ss.iTerm = LARGEST_INT64;
}
pCur->ss.iOBase = pCur->ss.iBase;
pCur->ss.iOTerm = pCur->ss.iTerm;

/* Extract the LIMIT and OFFSET values, but do not apply them yet.
** The range must first be constrained by the limits on value.
*/
if( idxNum & 0x20 ){
iLimit = sqlite3_value_int64(argv[i++]);
if( idxNum & 0x40 ){
iOffset = sqlite3_value_int64(argv[i++]);
}
}

if( idxNum & 0x3380 ){
/* Extract the maximum range of output values determined by
** constraints on the "value" column.
*/
if( idxNum & 0x0080 ){
iMin = iMax = sqlite3_value_int64(argv[i++]);
}else{
if( idxNum & 0x0300 ){
iMin = sqlite3_value_int64(argv[i++]);
if( idxNum & 0x0200 ){
if( iMin==LARGEST_INT64 ){
returnNoRows = 1;
}else{
iMin++;
}
}
}
if( idxNum & 0x3000 ){
iMax = sqlite3_value_int64(argv[i++]);
if( idxNum & 0x2000 ){
if( iMax==SMALLEST_INT64 ){
returnNoRows = 1;
}else{
iMax--;
}
}
}
if( iMin>iMax ){
returnNoRows = 1;
}
}

/* Try to reduce the range of values to be generated based on
** constraints on the "value" column.
*/
if( pCur->ss.iStep>0 ){
sqlite3_int64 szStep = pCur->ss.iStep;
if( pCur->ss.iBase<iMin ){
sqlite3_uint64 d = iMin - pCur->ss.iBase;
pCur->ss.iBase += ((d+szStep-1)/szStep)*szStep;
}
if( pCur->ss.iTerm>iMax ){
sqlite3_uint64 d = pCur->ss.iTerm - iMax;
pCur->ss.iTerm -= ((d+szStep-1)/szStep)*szStep;
}
}else{
sqlite3_int64 szStep = -pCur->ss.iStep;
assert( szStep>0 );
if( pCur->ss.iBase>iMax ){
sqlite3_uint64 d = pCur->ss.iBase - iMax;
pCur->ss.iBase -= ((d+szStep-1)/szStep)*szStep;
}
if( pCur->ss.iTerm<iMin ){
sqlite3_uint64 d = iMin - pCur->ss.iTerm;
pCur->ss.iTerm += ((d+szStep-1)/szStep)*szStep;
}
}
}

/* Apply LIMIT and OFFSET constraints, if any */
if( idxNum & 0x20 ){
if( iOffset>0 ){
pCur->ss.iBase += pCur->ss.iStep*iOffset;
}
if( iLimit>=0 ){
sqlite3_int64 iTerm;
iTerm = pCur->ss.iBase + (iLimit - 1)*pCur->ss.iStep;
if( pCur->ss.iStep<0 ){
if( iTerm>pCur->ss.iTerm ) pCur->ss.iTerm = iTerm;
}else{
if( iTerm<pCur->ss.iTerm ) pCur->ss.iTerm = iTerm;
}
}
}

for(i=0; i<argc; i++){
if( sqlite3_value_type(argv[i])==SQLITE_NULL ){
/* If any of the constraints have a NULL value, then return no rows.
** See ticket https://www.sqlite.org/src/info/fac496b61722daf2 */
returnNoRows = 1;
break;
}
}
if( returnNoRows ){
pCur->ss.iBase = 1;
pCur->ss.iTerm = 0;
pCur->ss.iStep = 1;
}
if( idxNum & 0x08 ){
pCur->ss.isReversing = pCur->ss.iStep > 0;
}else{
pCur->ss.isReversing = pCur->ss.iStep < 0;
}
setupSequence( &pCur->ss );
return SQLITE_OK;
}

/*
** SQLite will invoke this method one or more times while planning a query
** that uses the generate_series virtual table.  This routine needs to create
** a query plan for each invocation and compute an estimated cost for that
** plan.
**
** In this implementation idxNum is used to represent the
** query plan.  idxStr is unused.
**
** The query plan is represented by bits in idxNum:
**
**   0x0001  start = \$num
**   0x0002  stop = \$num
**   0x0004  step = \$num
**   0x0008  output is in descending order
**   0x0010  output is in ascending order
**   0x0020  LIMIT \$num
**   0x0040  OFFSET \$num
**   0x0080  value = \$num
**   0x0100  value >= \$num
**   0x0200  value > \$num
**   0x1000  value <= \$num
**   0x2000  value < \$num
**
** Only one of 0x0100 or 0x0200 will be returned.  Similarly, only
** one of 0x1000 or 0x2000 will be returned.  If the 0x0080 is set, then
** none of the 0xff00 bits will be set.
**
** The order of parameters passed to xFilter is as follows:
**
**    * The argument to start= if bit 0x0001 is in the idxNum mask
**    * The argument to stop= if bit 0x0002 is in the idxNum mask
**    * The argument to step= if bit 0x0004 is in the idxNum mask
**    * The argument to LIMIT if bit 0x0020 is in the idxNum mask
**    * The argument to OFFSET if bit 0x0040 is in the idxNum mask
**    * The argument to value=, or value>= or value> if any of
**      bits 0x0380 are in the idxNum mask
**    * The argument to value<= or value< if either of bits 0x3000
**
*/
static int seriesBestIndex(
sqlite3_vtab *pVTab,
sqlite3_index_info *pIdxInfo
){
int i, j;              /* Loop over constraints */
int idxNum = 0;        /* The query plan bitmask */
#ifndef ZERO_ARGUMENT_GENERATE_SERIES
int bStartSeen = 0;    /* EQ constraint seen on the START column */
#endif
int nArg = 0;          /* Number of arguments that seriesFilter() expects */
int aIdx[7];           /* Constraints on start, stop, step, LIMIT, OFFSET,
** and value.  aIdx[5] covers value=, value>=, and
** value>,  aIdx[6] covers value<= and value< */
const struct sqlite3_index_constraint *pConstraint;

/* This implementation assumes that the start, stop, and step columns
** are the last three columns in the virtual table. */
assert( SERIES_COLUMN_STOP == SERIES_COLUMN_START+1 );
assert( SERIES_COLUMN_STEP == SERIES_COLUMN_START+2 );

aIdx[0] = aIdx[1] = aIdx[2] = aIdx[3] = aIdx[4] = aIdx[5] = aIdx[6] = -1;
pConstraint = pIdxInfo->aConstraint;
for(i=0; i<pIdxInfo->nConstraint; i++, pConstraint++){
int iCol;    /* 0 for start, 1 for stop, 2 for step */
int op = pConstraint->op;
if( op>=SQLITE_INDEX_CONSTRAINT_LIMIT
&& op<=SQLITE_INDEX_CONSTRAINT_OFFSET
){
if( pConstraint->usable==0 ){
/* do nothing */
}else if( op==SQLITE_INDEX_CONSTRAINT_LIMIT ){
aIdx[3] = i;
idxNum |= 0x20;
}else{
assert( op==SQLITE_INDEX_CONSTRAINT_OFFSET );
aIdx[4] = i;
idxNum |= 0x40;
}
continue;
}
if( pConstraint->iColumn==SERIES_COLUMN_VALUE ){
switch( op ){
case SQLITE_INDEX_CONSTRAINT_EQ:
case SQLITE_INDEX_CONSTRAINT_IS: {
idxNum |=  0x0080;
idxNum &= ~0x3300;
aIdx[5] = i;
aIdx[6] = -1;
bStartSeen = 1;
break;
}
case SQLITE_INDEX_CONSTRAINT_GE: {
if( idxNum & 0x0080 ) break;
idxNum |=  0x0100;
idxNum &= ~0x0200;
aIdx[5] = i;
bStartSeen = 1;
break;
}
case SQLITE_INDEX_CONSTRAINT_GT: {
if( idxNum & 0x0080 ) break;
idxNum |=  0x0200;
idxNum &= ~0x0100;
aIdx[5] = i;
bStartSeen = 1;
break;
}
case SQLITE_INDEX_CONSTRAINT_LE: {
if( idxNum & 0x0080 ) break;
idxNum |=  0x1000;
idxNum &= ~0x2000;
aIdx[6] = i;
break;
}
case SQLITE_INDEX_CONSTRAINT_LT: {
if( idxNum & 0x0080 ) break;
idxNum |=  0x2000;
idxNum &= ~0x1000;
aIdx[6] = i;
break;
}
}
continue;
}
iCol = pConstraint->iColumn - SERIES_COLUMN_START;
assert( iCol>=0 && iCol<=2 );
#ifndef ZERO_ARGUMENT_GENERATE_SERIES
if( iCol==0 && op==SQLITE_INDEX_CONSTRAINT_EQ ){
bStartSeen = 1;
}
#endif
if( pConstraint->usable==0 ){
continue;
}else if( op==SQLITE_INDEX_CONSTRAINT_EQ ){
aIdx[iCol] = i;
}
}
if( aIdx[3]==0 ){
/* Ignore OFFSET if LIMIT is omitted */
idxNum &= ~0x60;
aIdx[4] = 0;
}
for(i=0; i<7; i++){
if( (j = aIdx[i])>=0 ){
pIdxInfo->aConstraintUsage[j].argvIndex = ++nArg;
pIdxInfo->aConstraintUsage[j].omit =
!SQLITE_SERIES_CONSTRAINT_VERIFY || i>=3;
}
}
/* The current generate_column() implementation requires at least one
** argument (the START value).  Legacy versions assumed START=0 if the
** first argument was omitted.  Compile with -DZERO_ARGUMENT_GENERATE_SERIES
** to obtain the legacy behavior */
#ifndef ZERO_ARGUMENT_GENERATE_SERIES
if( !bStartSeen ){
sqlite3_free(pVTab->zErrMsg);
pVTab->zErrMsg = sqlite3_mprintf(
"first argument to \"generate_series()\" missing or unusable");
return SQLITE_ERROR;
}
#endif
/* The start, stop, and step columns are inputs.  Therefore if there
** are unusable constraints on any of start, stop, or step then
** this plan is unusable */
return SQLITE_CONSTRAINT;
}
if( (idxNum & 0x03)==0x03 ){
/* Both start= and stop= boundaries are available.  This is the
** the preferred case */
pIdxInfo->estimatedCost = (double)(2 - ((idxNum&4)!=0));
pIdxInfo->estimatedRows = 1000;
if( pIdxInfo->nOrderBy>=1 && pIdxInfo->aOrderBy[0].iColumn==0 ){
if( pIdxInfo->aOrderBy[0].desc ){
idxNum |= 0x08;
}else{
idxNum |= 0x10;
}
pIdxInfo->orderByConsumed = 1;
}
}else if( (idxNum & 0x21)==0x21 ){
/* We have start= and LIMIT */
pIdxInfo->estimatedRows = 2500;
}else{
/* If either boundary is missing, we have to generate a huge span
** of numbers.  Make this case very expensive so that the query
** planner will work hard to avoid it. */
pIdxInfo->estimatedRows = 2147483647;
}
pIdxInfo->idxNum = idxNum;
#ifdef SQLITE_INDEX_SCAN_HEX
pIdxInfo->idxFlags = SQLITE_INDEX_SCAN_HEX;
#endif
return SQLITE_OK;
}

/*
** This following structure defines all the methods for the
** generate_series virtual table.
*/
static sqlite3_module seriesModule = {
0,                         /* iVersion */
0,                         /* xCreate */
seriesConnect,             /* xConnect */
seriesBestIndex,           /* xBestIndex */
seriesDisconnect,          /* xDisconnect */
0,                         /* xDestroy */
seriesOpen,                /* xOpen - open a cursor */
seriesClose,               /* xClose - close a cursor */
seriesFilter,              /* xFilter - configure scan constraints */
seriesNext,                /* xNext - advance a cursor */
seriesEof,                 /* xEof - check for end of scan */
seriesColumn,              /* xColumn - read data */
seriesRowid,               /* xRowid - read data */
0,                         /* xUpdate */
0,                         /* xBegin */
0,                         /* xSync */
0,                         /* xCommit */
0,                         /* xRollback */
0,                         /* xFindMethod */
0,                         /* xRename */
0,                         /* xSavepoint */
0,                         /* xRelease */
0,                         /* xRollbackTo */
0                          /* xIntegrity */
};

#endif /* SQLITE_OMIT_VIRTUALTABLE */

#ifdef _WIN32
__declspec(dllexport)
#endif
int sqlite3_series_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
int rc = SQLITE_OK;
SQLITE_EXTENSION_INIT2(pApi);
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( sqlite3_libversion_number()<3008012 && pzErrMsg!=0 ){
*pzErrMsg = sqlite3_mprintf(
"generate_series() requires SQLite 3.8.12 or later");
return SQLITE_ERROR;
}
rc = sqlite3_create_module(db, "generate_series", &seriesModule, 0);
#endif
return rc;
}
```
```