// Code generated by modernc.org/undup from the per-target sqlite_*.go files; DO NOT EDIT.

//go:build (darwin && amd64) || (darwin && arm64) || (freebsd && amd64) || (freebsd && arm) || (freebsd && arm64) || (linux && amd64) || (linux && arm) || (linux && arm64) || (linux && loong64) || (linux && ppc64le) || (linux && riscv64) || (linux && s390x) || (netbsd && amd64) || (openbsd && amd64) || (openbsd && arm64)

package sqlite3

import (
	"unsafe"

	"modernc.org/libc"
)

func _fts5DoclistIterNext(tls *libc.TLS, pIter uintptr) {
	bp := tls.Alloc(16)
	defer tls.Free(16)
	var p uintptr
	var _ /* iDelta at bp+0 */ Ti64
	var _ /* nPos at bp+8 */ int32
	_ = p
	p = (*TFts5DoclistIter)(unsafe.Pointer(pIter)).FaPoslist + uintptr((*TFts5DoclistIter)(unsafe.Pointer(pIter)).FnSize) + uintptr((*TFts5DoclistIter)(unsafe.Pointer(pIter)).FnPoslist)
	if p >= (*TFts5DoclistIter)(unsafe.Pointer(pIter)).FaEof {
		(*TFts5DoclistIter)(unsafe.Pointer(pIter)).FaPoslist = uintptr(0)
	} else {
		p = p + uintptr(_sqlite3Fts5GetVarint(tls, p, bp))
		**(**Ti64)(__ccgo_up(pIter + 8)) += **(**Ti64)(__ccgo_up(bp))
		/* Read position list size */
		if libc.Int32FromUint8(**(**Tu8)(__ccgo_up(p)))&int32(0x80) != 0 {
			(*TFts5DoclistIter)(unsafe.Pointer(pIter)).FnSize = _sqlite3Fts5GetVarint32(tls, p, bp+8)
			(*TFts5DoclistIter)(unsafe.Pointer(pIter)).FnPoslist = **(**int32)(__ccgo_up(bp + 8)) >> int32(1)
		} else {
			(*TFts5DoclistIter)(unsafe.Pointer(pIter)).FnPoslist = libc.Int32FromUint8(**(**Tu8)(__ccgo_up(p))) >> int32(1)
			(*TFts5DoclistIter)(unsafe.Pointer(pIter)).FnSize = int32(1)
		}
		(*TFts5DoclistIter)(unsafe.Pointer(pIter)).FaPoslist = p
		if (*TFts5DoclistIter)(unsafe.Pointer(pIter)).FaPoslist+uintptr((*TFts5DoclistIter)(unsafe.Pointer(pIter)).FnPoslist) > (*TFts5DoclistIter)(unsafe.Pointer(pIter)).FaEof {
			(*TFts5DoclistIter)(unsafe.Pointer(pIter)).FaPoslist = uintptr(0)
		}
	}
}

// C documentation
//
//	/*
//	** A total of nLeaf leaf pages of data has just been flushed to a level-0
//	** segment. This function updates the write-counter accordingly and, if
//	** necessary, performs incremental merge work.
//	**
//	** If an error occurs, set the Fts5Index.rc error code. If an error has
//	** already occurred, this function is a no-op.
//	*/
func _fts5IndexAutomerge(tls *libc.TLS, p uintptr, ppStruct uintptr, nLeaf int32) {
	var nRem, nWork int32
	var nWrite Tu64
	var pStruct uintptr
	_, _, _, _ = nRem, nWork, nWrite, pStruct
	if (*TFts5Index)(unsafe.Pointer(p)).Frc == SQLITE_OK && (*TFts5Config)(unsafe.Pointer((*TFts5Index)(unsafe.Pointer(p)).FpConfig)).FnAutomerge > 0 && **(**uintptr)(__ccgo_up(ppStruct)) != uintptr(0) {
		pStruct = **(**uintptr)(__ccgo_up(ppStruct)) /* Number of leaf pages left to write */
		/* Update the write-counter. While doing so, set nWork. */
		nWrite = (*TFts5Structure)(unsafe.Pointer(pStruct)).FnWriteCounter
		nWork = libc.Int32FromUint64((nWrite+libc.Uint64FromInt32(nLeaf))/libc.Uint64FromInt32((*TFts5Index)(unsafe.Pointer(p)).FnWorkUnit) - nWrite/libc.Uint64FromInt32((*TFts5Index)(unsafe.Pointer(p)).FnWorkUnit))
		**(**Tu64)(__ccgo_up(pStruct + 8)) += libc.Uint64FromInt32(nLeaf)
		nRem = (*TFts5Index)(unsafe.Pointer(p)).FnWorkUnit * nWork * (*TFts5Structure)(unsafe.Pointer(pStruct)).FnLevel
		_fts5IndexMerge(tls, p, ppStruct, nRem, (*TFts5Config)(unsafe.Pointer((*TFts5Index)(unsafe.Pointer(p)).FpConfig)).FnAutomerge)
	}
}

// C documentation
//
//	/*
//	** Check the RTree node or entry given by pCellData and p against the MATCH
//	** constraint pConstraint.
//	*/
func _rtreeCallbackConstraint(tls *libc.TLS, pConstraint uintptr, eInt int32, pCellData uintptr, pSearch uintptr, prScore uintptr, peWithin uintptr) (r int32) {
	bp := tls.Alloc(96)
	defer tls.Free(96)
	var nCoord, rc, v2 int32
	var pInfo uintptr
	var v1 Tsqlite3_rtree_dbl
	var _ /* aCoord at bp+8 */ [10]Tsqlite3_rtree_dbl
	var _ /* c at bp+0 */ TRtreeCoord
	var _ /* eWithin at bp+88 */ int32
	_, _, _, _, _ = nCoord, pInfo, rc, v1, v2
	pInfo = (*TRtreeConstraint)(unsafe.Pointer(pConstraint)).FpInfo      /* Callback info */
	nCoord = (*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FnCoord /* Decoded coordinates */
	if (*TRtreeConstraint)(unsafe.Pointer(pConstraint)).Fop == int32(RTREE_QUERY) && libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(pSearch)).FiLevel) == int32(1) {
		(*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FiRowid = _readInt64(tls, pCellData)
	}
	pCellData = pCellData + uintptr(8)
	if eInt == 0 {
		switch nCoord {
		case int32(10):
			_readCoord(tls, pCellData+uintptr(36), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(9)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData+uintptr(32), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(8)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			fallthrough
		case int32(8):
			_readCoord(tls, pCellData+uintptr(28), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(7)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData+uintptr(24), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(6)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			fallthrough
		case int32(6):
			_readCoord(tls, pCellData+uintptr(20), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(5)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData+uintptr(16), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(4)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			fallthrough
		case int32(4):
			_readCoord(tls, pCellData+uintptr(12), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(3)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData+uintptr(8), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(2)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			fallthrough
		default:
			_readCoord(tls, pCellData+uintptr(4), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(1)] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData, bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[0] = float64(*(*TRtreeValue)(unsafe.Pointer(bp)))
		}
	} else {
		switch nCoord {
		case int32(10):
			_readCoord(tls, pCellData+uintptr(36), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(9)] = float64(*(*int32)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData+uintptr(32), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(8)] = float64(*(*int32)(unsafe.Pointer(bp)))
			fallthrough
		case int32(8):
			_readCoord(tls, pCellData+uintptr(28), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(7)] = float64(*(*int32)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData+uintptr(24), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(6)] = float64(*(*int32)(unsafe.Pointer(bp)))
			fallthrough
		case int32(6):
			_readCoord(tls, pCellData+uintptr(20), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(5)] = float64(*(*int32)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData+uintptr(16), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(4)] = float64(*(*int32)(unsafe.Pointer(bp)))
			fallthrough
		case int32(4):
			_readCoord(tls, pCellData+uintptr(12), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(3)] = float64(*(*int32)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData+uintptr(8), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(2)] = float64(*(*int32)(unsafe.Pointer(bp)))
			fallthrough
		default:
			_readCoord(tls, pCellData+uintptr(4), bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[int32(1)] = float64(*(*int32)(unsafe.Pointer(bp)))
			_readCoord(tls, pCellData, bp)
			(**(**[10]Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)))[0] = float64(*(*int32)(unsafe.Pointer(bp)))
		}
	}
	if (*TRtreeConstraint)(unsafe.Pointer(pConstraint)).Fop == int32(RTREE_MATCH) {
		**(**int32)(__ccgo_up(bp + 88)) = 0
		rc = (*(*func(*libc.TLS, uintptr, int32, uintptr, uintptr) int32)(unsafe.Pointer(&struct{ uintptr }{*(*uintptr)(unsafe.Pointer(&(*TRtreeConstraint)(unsafe.Pointer(pConstraint)).Fu))})))(tls, pInfo, nCoord, bp+8, bp+88)
		if **(**int32)(__ccgo_up(bp + 88)) == 0 {
			**(**int32)(__ccgo_up(peWithin)) = NOT_WITHIN
		}
		**(**Tsqlite3_rtree_dbl)(__ccgo_up(prScore)) = float64(0)
	} else {
		(*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FaCoord = bp + 8
		(*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FiLevel = libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(pSearch)).FiLevel) - int32(1)
		v1 = (*TRtreeSearchPoint)(unsafe.Pointer(pSearch)).FrScore
		(*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FrParentScore = v1
		(*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FrScore = v1
		v2 = libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(pSearch)).FeWithin)
		(*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FeParentWithin = v2
		(*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FeWithin = v2
		rc = (*(*func(*libc.TLS, uintptr) int32)(unsafe.Pointer(&struct{ uintptr }{*(*uintptr)(unsafe.Pointer(&(*TRtreeConstraint)(unsafe.Pointer(pConstraint)).Fu))})))(tls, pInfo)
		if (*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FeWithin < **(**int32)(__ccgo_up(peWithin)) {
			**(**int32)(__ccgo_up(peWithin)) = (*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FeWithin
		}
		if (*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FrScore < **(**Tsqlite3_rtree_dbl)(__ccgo_up(prScore)) || **(**Tsqlite3_rtree_dbl)(__ccgo_up(prScore)) < float64(0) {
			**(**Tsqlite3_rtree_dbl)(__ccgo_up(prScore)) = (*Tsqlite3_rtree_query_info)(unsafe.Pointer(pInfo)).FrScore
		}
	}
	return rc
}

// C documentation
//
//	/*
//	** Continue the search on cursor pCur until the front of the queue
//	** contains an entry suitable for returning as a result-set row,
//	** or until the RtreeSearchPoint queue is empty, indicating that the
//	** query has completed.
//	*/
func _rtreeStepToLeaf(tls *libc.TLS, pCur uintptr) (r int32) {
	bp := tls.Alloc(16)
	defer tls.Free(16)
	var eInt, ii, nCell, nConstraint int32
	var p, pCellData, pConstraint, pNode, pRtree, v1 uintptr
	var x TRtreeSearchPoint
	var _ /* eWithin at bp+0 */ int32
	var _ /* rScore at bp+8 */ Tsqlite3_rtree_dbl
	var _ /* rc at bp+4 */ int32
	_, _, _, _, _, _, _, _, _, _, _ = eInt, ii, nCell, nConstraint, p, pCellData, pConstraint, pNode, pRtree, x, v1
	pRtree = (*TRtreeCursor)(unsafe.Pointer(pCur)).Fbase.FpVtab
	**(**int32)(__ccgo_up(bp + 4)) = SQLITE_OK
	nConstraint = (*TRtreeCursor)(unsafe.Pointer(pCur)).FnConstraint
	eInt = libc.BoolInt32(libc.Int32FromUint8((*TRtree)(unsafe.Pointer(pRtree)).FeCoordType) == int32(RTREE_COORD_INT32))
	for {
		v1 = _rtreeSearchPointFirst(tls, pCur)
		p = v1
		if !(v1 != uintptr(0) && libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(p)).FiLevel) > 0) {
			break
		}
		pNode = _rtreeNodeOfFirstSearchPoint(tls, pCur, bp+4)
		if **(**int32)(__ccgo_up(bp + 4)) != 0 {
			return **(**int32)(__ccgo_up(bp + 4))
		}
		nCell = _readInt16(tls, (*TRtreeNode)(unsafe.Pointer(pNode)).FzData+2)
		if nCell > int32(RTREE_MAXCELLS) {
			return libc.Int32FromInt32(SQLITE_CORRUPT) | libc.Int32FromInt32(1)<<libc.Int32FromInt32(8)
		}
		pCellData = (*TRtreeNode)(unsafe.Pointer(pNode)).FzData + uintptr(libc.Int32FromInt32(4)+libc.Int32FromUint8((*TRtree)(unsafe.Pointer(pRtree)).FnBytesPerCell)*libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell))
		for libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell) < nCell {
			**(**Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)) = float64(-libc.Int32FromInt32(1))
			**(**int32)(__ccgo_up(bp)) = int32(FULLY_WITHIN)
			ii = 0
			for {
				if !(ii < nConstraint) {
					break
				}
				pConstraint = (*TRtreeCursor)(unsafe.Pointer(pCur)).FaConstraint + uintptr(ii)*24
				if (*TRtreeConstraint)(unsafe.Pointer(pConstraint)).Fop >= int32(RTREE_MATCH) {
					**(**int32)(__ccgo_up(bp + 4)) = _rtreeCallbackConstraint(tls, pConstraint, eInt, pCellData, p, bp+8, bp)
					if **(**int32)(__ccgo_up(bp + 4)) != 0 {
						return **(**int32)(__ccgo_up(bp + 4))
					}
				} else {
					if libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(p)).FiLevel) == int32(1) {
						_rtreeLeafConstraint(tls, pConstraint, eInt, pCellData, bp)
					} else {
						_rtreeNonleafConstraint(tls, pConstraint, eInt, pCellData, bp)
					}
				}
				if **(**int32)(__ccgo_up(bp)) == NOT_WITHIN {
					(*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell = (*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell + 1
					pCellData = pCellData + uintptr((*TRtree)(unsafe.Pointer(pRtree)).FnBytesPerCell)
					break
				}
				goto _2
			_2:
				;
				ii = ii + 1
			}
			if **(**int32)(__ccgo_up(bp)) == NOT_WITHIN {
				continue
			}
			(*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell = (*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell + 1
			x.FiLevel = libc.Uint8FromInt32(libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(p)).FiLevel) - int32(1))
			if x.FiLevel != 0 {
				x.Fid = _readInt64(tls, pCellData)
				ii = 0
				for {
					if !(ii < (*TRtreeCursor)(unsafe.Pointer(pCur)).FnPoint) {
						break
					}
					if (**(**TRtreeSearchPoint)(__ccgo_up((*TRtreeCursor)(unsafe.Pointer(pCur)).FaPoint + uintptr(ii)*24))).Fid == x.Fid {
						return libc.Int32FromInt32(SQLITE_CORRUPT) | libc.Int32FromInt32(1)<<libc.Int32FromInt32(8)
					}
					goto _3
				_3:
					;
					ii = ii + 1
				}
				x.FiCell = uint8(0)
			} else {
				x.Fid = (*TRtreeSearchPoint)(unsafe.Pointer(p)).Fid
				x.FiCell = libc.Uint8FromInt32(libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell) - int32(1))
			}
			if libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell) >= nCell {
				_rtreeSearchPointPop(tls, pCur)
			}
			if **(**Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)) < float64(0) {
				**(**Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)) = float64(0)
			}
			p = _rtreeSearchPointNew(tls, pCur, **(**Tsqlite3_rtree_dbl)(__ccgo_up(bp + 8)), x.FiLevel)
			if p == uintptr(0) {
				return int32(SQLITE_NOMEM)
			}
			(*TRtreeSearchPoint)(unsafe.Pointer(p)).FeWithin = libc.Uint8FromInt32(**(**int32)(__ccgo_up(bp)))
			(*TRtreeSearchPoint)(unsafe.Pointer(p)).Fid = x.Fid
			(*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell = x.FiCell
			break
		}
		if libc.Int32FromUint8((*TRtreeSearchPoint)(unsafe.Pointer(p)).FiCell) >= nCell {
			_rtreeSearchPointPop(tls, pCur)
		}
	}
	(*TRtreeCursor)(unsafe.Pointer(pCur)).FatEOF = libc.BoolUint8(p == uintptr(0))
	return SQLITE_OK
}

// C documentation
//
//	/*
//	** Routines used to compute the sum, average, and total.
//	**
//	** The SUM() function follows the (broken) SQL standard which means
//	** that it returns NULL if it sums over no inputs.  TOTAL returns
//	** 0.0 in that case.  In addition, TOTAL always returns a float where
//	** SUM might return an integer if it never encounters a floating point
//	** value.  TOTAL never fails, but SUM might throw an exception if
//	** it overflows an integer.
//	*/
func _sumStep(tls *libc.TLS, context uintptr, argc int32, argv uintptr) {
	bp := tls.Alloc(16)
	defer tls.Free(16)
	var p uintptr
	var type1 int32
	var _ /* x at bp+0 */ Ti64
	_, _ = p, type1
	_ = argc
	p = Xsqlite3_aggregate_context(tls, context, int32(40))
	type1 = Xsqlite3_value_numeric_type(tls, **(**uintptr)(__ccgo_up(argv)))
	if p != 0 && type1 != int32(SQLITE_NULL) {
		(*TSumCtx)(unsafe.Pointer(p)).Fcnt = (*TSumCtx)(unsafe.Pointer(p)).Fcnt + 1
		if libc.Int32FromUint8((*TSumCtx)(unsafe.Pointer(p)).Fapprox) == 0 {
			if type1 != int32(SQLITE_INTEGER) {
				_kahanBabuskaNeumaierInit(tls, p, (*TSumCtx)(unsafe.Pointer(p)).FiSum)
				(*TSumCtx)(unsafe.Pointer(p)).Fapprox = uint8(1)
				_kahanBabuskaNeumaierStep(tls, p, Xsqlite3_value_double(tls, **(**uintptr)(__ccgo_up(argv))))
			} else {
				**(**Ti64)(__ccgo_up(bp)) = (*TSumCtx)(unsafe.Pointer(p)).FiSum
				if _sqlite3AddInt64(tls, bp, Xsqlite3_value_int64(tls, **(**uintptr)(__ccgo_up(argv)))) == 0 {
					(*TSumCtx)(unsafe.Pointer(p)).FiSum = **(**Ti64)(__ccgo_up(bp))
				} else {
					(*TSumCtx)(unsafe.Pointer(p)).Fovrfl = uint8(1)
					_kahanBabuskaNeumaierInit(tls, p, (*TSumCtx)(unsafe.Pointer(p)).FiSum)
					(*TSumCtx)(unsafe.Pointer(p)).Fapprox = uint8(1)
					_kahanBabuskaNeumaierStepInt64(tls, p, Xsqlite3_value_int64(tls, **(**uintptr)(__ccgo_up(argv))))
				}
			}
		} else {
			if type1 == int32(SQLITE_INTEGER) {
				_kahanBabuskaNeumaierStepInt64(tls, p, Xsqlite3_value_int64(tls, **(**uintptr)(__ccgo_up(argv))))
			} else {
				(*TSumCtx)(unsafe.Pointer(p)).Fovrfl = uint8(0)
				_kahanBabuskaNeumaierStep(tls, p, Xsqlite3_value_double(tls, **(**uintptr)(__ccgo_up(argv))))
			}
		}
	}
}

// C documentation
//
//	/*
//	** Estimate the number of rows that will be returned based on
//	** an equality constraint x=VALUE and where that VALUE occurs in
//	** the histogram data.  This only works when x is the left-most
//	** column of an index and sqlite_stat4 histogram data is available
//	** for that index.  When pExpr==NULL that means the constraint is
//	** "x IS NULL" instead of "x=VALUE".
//	**
//	** Write the estimated row count into *pnRow and return SQLITE_OK.
//	** If unable to make an estimate, leave *pnRow unchanged and return
//	** non-zero.
//	**
//	** This routine can fail if it is unable to load a collating sequence
//	** required for string comparison, or if unable to allocate memory
//	** for a UTF conversion required for comparison.  The error is stored
//	** in the pParse structure.
//	*/
func _whereEqualScanEst(tls *libc.TLS, pParse uintptr, pBuilder uintptr, pExpr uintptr, pnRow uintptr) (r int32) {
	bp := tls.Alloc(32)
	defer tls.Free(32)
	var nEq, rc int32
	var p uintptr
	var _ /* a at bp+8 */ [2]TtRowcnt
	var _ /* bOk at bp+24 */ int32
	var _ /* pRec at bp+0 */ uintptr
	_, _, _ = nEq, p, rc
	p = (*(*struct {
		FnEq          Tu16
		FnBtm         Tu16
		FnTop         Tu16
		FnDistinctCol Tu16
		FpIndex       uintptr
		FpOrderBy     uintptr
	})(unsafe.Pointer((*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FpNew + 24))).FpIndex
	nEq = libc.Int32FromUint16((*(*struct {
		FnEq          Tu16
		FnBtm         Tu16
		FnTop         Tu16
		FnDistinctCol Tu16
		FpIndex       uintptr
		FpOrderBy     uintptr
	})(unsafe.Pointer((*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FpNew + 24))).FnEq)
	**(**uintptr)(__ccgo_up(bp)) = (*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FpRec
	/* If values are not available for all fields of the index to the left
	 ** of this one, no estimate can be made. Return SQLITE_NOTFOUND. */
	if (*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FnRecValid < nEq-int32(1) {
		return int32(SQLITE_NOTFOUND)
	}
	/* This is an optimization only. The call to sqlite3Stat4ProbeSetValue()
	 ** below would return the same value.  */
	if nEq >= libc.Int32FromUint16((*TIndex)(unsafe.Pointer(p)).FnColumn) {
		**(**TtRowcnt)(__ccgo_up(pnRow)) = uint64(1)
		return SQLITE_OK
	}
	rc = _sqlite3Stat4ProbeSetValue(tls, pParse, p, bp, pExpr, int32(1), nEq-int32(1), bp+24)
	(*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FpRec = **(**uintptr)(__ccgo_up(bp))
	if rc != SQLITE_OK {
		return rc
	}
	if **(**int32)(__ccgo_up(bp + 24)) == 0 {
		return int32(SQLITE_NOTFOUND)
	}
	(*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FnRecValid = nEq
	_whereKeyStats(tls, pParse, p, **(**uintptr)(__ccgo_up(bp)), 0, bp+8)
	**(**TtRowcnt)(__ccgo_up(pnRow)) = (**(**[2]TtRowcnt)(__ccgo_up(bp + 8)))[int32(1)]
	return rc
}

// C documentation
//
//	/*
//	** Try to insert a new prerequisite/cost entry into the WhereOrSet pSet.
//	**
//	** The new entry might overwrite an existing entry, or it might be
//	** appended, or it might be discarded.  Do whatever is the right thing
//	** so that pSet keeps the N_OR_COST best entries seen so far.
//	*/
func _whereOrInsert(tls *libc.TLS, pSet uintptr, prereq TBitmask, rRun TLogEst, nOut TLogEst) (r int32) {
	var i, v2 Tu16
	var p, v3 uintptr
	_, _, _, _ = i, p, v2, v3
	i = (*TWhereOrSet)(unsafe.Pointer(pSet)).Fn
	p = pSet + 8
	for {
		if !(libc.Int32FromUint16(i) > 0) {
			break
		}
		if int32(rRun) <= int32((*TWhereOrCost)(unsafe.Pointer(p)).FrRun) && prereq&(*TWhereOrCost)(unsafe.Pointer(p)).Fprereq == prereq {
			goto whereOrInsert_done
		}
		if int32((*TWhereOrCost)(unsafe.Pointer(p)).FrRun) <= int32(rRun) && (*TWhereOrCost)(unsafe.Pointer(p)).Fprereq&prereq == (*TWhereOrCost)(unsafe.Pointer(p)).Fprereq {
			return 0
		}
		goto _1
	_1:
		;
		i = i - 1
		p += 16
	}
	if libc.Int32FromUint16((*TWhereOrSet)(unsafe.Pointer(pSet)).Fn) < int32(N_OR_COST) {
		v3 = pSet
		v2 = *(*Tu16)(unsafe.Pointer(v3))
		*(*Tu16)(unsafe.Pointer(v3)) = *(*Tu16)(unsafe.Pointer(v3)) + 1
		p = pSet + 8 + uintptr(v2)*16
		(*TWhereOrCost)(unsafe.Pointer(p)).FnOut = nOut
	} else {
		p = pSet + 8
		i = uint16(1)
		for {
			if !(libc.Int32FromUint16(i) < libc.Int32FromUint16((*TWhereOrSet)(unsafe.Pointer(pSet)).Fn)) {
				break
			}
			if int32((*TWhereOrCost)(unsafe.Pointer(p)).FrRun) > int32((**(**TWhereOrCost)(__ccgo_up(pSet + 8 + uintptr(i)*16))).FrRun) {
				p = pSet + 8 + uintptr(i)*16
			}
			goto _4
		_4:
			;
			i = i + 1
		}
		if int32((*TWhereOrCost)(unsafe.Pointer(p)).FrRun) <= int32(rRun) {
			return 0
		}
	}
	goto whereOrInsert_done
whereOrInsert_done:
	;
	(*TWhereOrCost)(unsafe.Pointer(p)).Fprereq = prereq
	(*TWhereOrCost)(unsafe.Pointer(p)).FrRun = rRun
	if int32((*TWhereOrCost)(unsafe.Pointer(p)).FnOut) > int32(nOut) {
		(*TWhereOrCost)(unsafe.Pointer(p)).FnOut = nOut
	}
	return int32(1)
}

// C documentation
//
//	/*
//	** This function is used to estimate the number of rows that will be visited
//	** by scanning an index for a range of values. The range may have an upper
//	** bound, a lower bound, or both. The WHERE clause terms that set the upper
//	** and lower bounds are represented by pLower and pUpper respectively. For
//	** example, assuming that index p is on t1(a):
//	**
//	**   ... FROM t1 WHERE a > ? AND a < ? ...
//	**                    |_____|   |_____|
//	**                       |         |
//	**                     pLower    pUpper
//	**
//	** If either of the upper or lower bound is not present, then NULL is passed in
//	** place of the corresponding WhereTerm.
//	**
//	** The value in (pBuilder->pNew->u.btree.nEq) is the number of the index
//	** column subject to the range constraint. Or, equivalently, the number of
//	** equality constraints optimized by the proposed index scan. For example,
//	** assuming index p is on t1(a, b), and the SQL query is:
//	**
//	**   ... FROM t1 WHERE a = ? AND b > ? AND b < ? ...
//	**
//	** then nEq is set to 1 (as the range restricted column, b, is the second
//	** left-most column of the index). Or, if the query is:
//	**
//	**   ... FROM t1 WHERE a > ? AND a < ? ...
//	**
//	** then nEq is set to 0.
//	**
//	** When this function is called, *pnOut is set to the sqlite3LogEst() of the
//	** number of rows that the index scan is expected to visit without
//	** considering the range constraints. If nEq is 0, then *pnOut is the number of
//	** rows in the index. Assuming no error occurs, *pnOut is adjusted (reduced)
//	** to account for the range constraints pLower and pUpper.
//	**
//	** In the absence of sqlite_stat4 ANALYZE data, or if such data cannot be
//	** used, a single range inequality reduces the search space by a factor of 4.
//	** and a pair of constraints (x>? AND x<?) reduces the expected number of
//	** rows visited by a factor of 64.
//	*/
func _whereRangeScanEst(tls *libc.TLS, pParse uintptr, pBuilder uintptr, pLower uintptr, pUpper uintptr, pLoop uintptr) (r int32) {
	bp := tls.Alloc(48)
	defer tls.Free(48)
	var iLower, iNew, iNew1, iUpper TtRowcnt
	var iLwrIdx, iUprIdx, nBtm, nEq, nOut, nTop, rc, t1 int32
	var mask, mask1 Tu16
	var nNew TLogEst
	var p, pExpr, pExpr1, t uintptr
	var v1 uint64
	var _ /* a at bp+8 */ [2]TtRowcnt
	var _ /* bDone at bp+32 */ int32
	var _ /* n at bp+24 */ int32
	var _ /* n at bp+28 */ int32
	var _ /* pRec at bp+0 */ uintptr
	_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _ = iLower, iLwrIdx, iNew, iNew1, iUpper, iUprIdx, mask, mask1, nBtm, nEq, nNew, nOut, nTop, p, pExpr, pExpr1, rc, t, t1, v1
	rc = SQLITE_OK
	nOut = int32((*TWhereLoop)(unsafe.Pointer(pLoop)).FnOut)
	p = (*(*struct {
		FnEq          Tu16
		FnBtm         Tu16
		FnTop         Tu16
		FnDistinctCol Tu16
		FpIndex       uintptr
		FpOrderBy     uintptr
	})(unsafe.Pointer(pLoop + 24))).FpIndex
	nEq = libc.Int32FromUint16((*(*struct {
		FnEq          Tu16
		FnBtm         Tu16
		FnTop         Tu16
		FnDistinctCol Tu16
		FpIndex       uintptr
		FpOrderBy     uintptr
	})(unsafe.Pointer(pLoop + 24))).FnEq)
	if (*TIndex)(unsafe.Pointer(p)).FnSample > 0 && nEq < (*TIndex)(unsafe.Pointer(p)).FnSampleCol && (*Tsqlite3)(unsafe.Pointer((*TParse)(unsafe.Pointer(pParse)).Fdb)).FdbOptFlags&libc.Uint32FromInt32(libc.Int32FromInt32(SQLITE_Stat4)) == uint32(0) {
		if nEq == (*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FnRecValid {
			**(**uintptr)(__ccgo_up(bp)) = (*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FpRec
			nBtm = libc.Int32FromUint16((*(*struct {
				FnEq          Tu16
				FnBtm         Tu16
				FnTop         Tu16
				FnDistinctCol Tu16
				FpIndex       uintptr
				FpOrderBy     uintptr
			})(unsafe.Pointer(pLoop + 24))).FnBtm)
			nTop = libc.Int32FromUint16((*(*struct {
				FnEq          Tu16
				FnBtm         Tu16
				FnTop         Tu16
				FnDistinctCol Tu16
				FpIndex       uintptr
				FpOrderBy     uintptr
			})(unsafe.Pointer(pLoop + 24))).FnTop) /* Rows less than the upper bound */
			iLwrIdx = -int32(2) /* aSample[] for the lower bound */
			iUprIdx = -int32(1) /* aSample[] for the upper bound */
			if **(**uintptr)(__ccgo_up(bp)) != 0 {
				(*TUnpackedRecord)(unsafe.Pointer(**(**uintptr)(__ccgo_up(bp)))).FnField = libc.Uint16FromInt32((*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FnRecValid)
			}
			/* Determine iLower and iUpper using ($P) only. */
			if nEq == 0 {
				iLower = uint64(0)
				iUpper = (*TIndex)(unsafe.Pointer(p)).FnRowEst0
			} else {
				/* Note: this call could be optimized away - since the same values must
				 ** have been requested when testing key $P in whereEqualScanEst().  */
				_whereKeyStats(tls, pParse, p, **(**uintptr)(__ccgo_up(bp)), 0, bp+8)
				iLower = (**(**[2]TtRowcnt)(__ccgo_up(bp + 8)))[0]
				iUpper = (**(**[2]TtRowcnt)(__ccgo_up(bp + 8)))[0] + (**(**[2]TtRowcnt)(__ccgo_up(bp + 8)))[int32(1)]
			}
			if **(**Tu8)(__ccgo_up((*TIndex)(unsafe.Pointer(p)).FaSortOrder + uintptr(nEq))) != 0 {
				/* The roles of pLower and pUpper are swapped for a DESC index */
				t = pLower
				pLower = pUpper
				pUpper = t
				t1 = nBtm
				nBtm = nTop
				nTop = t1
			}
			/* If possible, improve on the iLower estimate using ($P:$L). */
			if pLower != 0 { /* Values extracted from pExpr */
				pExpr = (*TExpr)(unsafe.Pointer((*TWhereTerm)(unsafe.Pointer(pLower)).FpExpr)).FpRight
				rc = _sqlite3Stat4ProbeSetValue(tls, pParse, p, bp, pExpr, nBtm, nEq, bp+24)
				if rc == SQLITE_OK && **(**int32)(__ccgo_up(bp + 24)) != 0 {
					mask = libc.Uint16FromInt32(libc.Int32FromInt32(WO_EQ)<<(libc.Int32FromInt32(TK_GT)-libc.Int32FromInt32(TK_EQ)) | libc.Int32FromInt32(WO_EQ)<<(libc.Int32FromInt32(TK_LE)-libc.Int32FromInt32(TK_EQ)))
					if _sqlite3ExprVectorSize(tls, pExpr) > **(**int32)(__ccgo_up(bp + 24)) {
						mask = libc.Uint16FromInt32(libc.Int32FromInt32(WO_EQ)<<(libc.Int32FromInt32(TK_LE)-libc.Int32FromInt32(TK_EQ)) | libc.Int32FromInt32(WO_EQ)<<(libc.Int32FromInt32(TK_LT)-libc.Int32FromInt32(TK_EQ)))
					}
					iLwrIdx = _whereKeyStats(tls, pParse, p, **(**uintptr)(__ccgo_up(bp)), 0, bp+8)
					if libc.Int32FromUint16((*TWhereTerm)(unsafe.Pointer(pLower)).FeOperator)&libc.Int32FromUint16(mask) != 0 {
						v1 = (**(**[2]TtRowcnt)(__ccgo_up(bp + 8)))[int32(1)]
					} else {
						v1 = uint64(0)
					}
					iNew = (**(**[2]TtRowcnt)(__ccgo_up(bp + 8)))[0] + v1
					if iNew > iLower {
						iLower = iNew
					}
					nOut = nOut - 1
					pLower = uintptr(0)
				}
			}
			/* If possible, improve on the iUpper estimate using ($P:$U). */
			if pUpper != 0 { /* Values extracted from pExpr */
				pExpr1 = (*TExpr)(unsafe.Pointer((*TWhereTerm)(unsafe.Pointer(pUpper)).FpExpr)).FpRight
				rc = _sqlite3Stat4ProbeSetValue(tls, pParse, p, bp, pExpr1, nTop, nEq, bp+28)
				if rc == SQLITE_OK && **(**int32)(__ccgo_up(bp + 28)) != 0 {
					mask1 = libc.Uint16FromInt32(libc.Int32FromInt32(WO_EQ)<<(libc.Int32FromInt32(TK_GT)-libc.Int32FromInt32(TK_EQ)) | libc.Int32FromInt32(WO_EQ)<<(libc.Int32FromInt32(TK_LE)-libc.Int32FromInt32(TK_EQ)))
					if _sqlite3ExprVectorSize(tls, pExpr1) > **(**int32)(__ccgo_up(bp + 28)) {
						mask1 = libc.Uint16FromInt32(libc.Int32FromInt32(WO_EQ)<<(libc.Int32FromInt32(TK_LE)-libc.Int32FromInt32(TK_EQ)) | libc.Int32FromInt32(WO_EQ)<<(libc.Int32FromInt32(TK_LT)-libc.Int32FromInt32(TK_EQ)))
					}
					iUprIdx = _whereKeyStats(tls, pParse, p, **(**uintptr)(__ccgo_up(bp)), int32(1), bp+8)
					if libc.Int32FromUint16((*TWhereTerm)(unsafe.Pointer(pUpper)).FeOperator)&libc.Int32FromUint16(mask1) != 0 {
						v1 = (**(**[2]TtRowcnt)(__ccgo_up(bp + 8)))[int32(1)]
					} else {
						v1 = uint64(0)
					}
					iNew1 = (**(**[2]TtRowcnt)(__ccgo_up(bp + 8)))[0] + v1
					if iNew1 < iUpper {
						iUpper = iNew1
					}
					nOut = nOut - 1
					pUpper = uintptr(0)
				}
			}
			(*TWhereLoopBuilder)(unsafe.Pointer(pBuilder)).FpRec = **(**uintptr)(__ccgo_up(bp))
			if rc == SQLITE_OK {
				if iUpper > iLower {
					nNew = _sqlite3LogEst(tls, iUpper-iLower)
					/* TUNING:  If both iUpper and iLower are derived from the same
					 ** sample, then assume they are 4x more selective.  This brings
					 ** the estimated selectivity more in line with what it would be
					 ** if estimated without the use of STAT4 tables. */
					if iLwrIdx == iUprIdx {
						nNew = int16(int32(nNew) - libc.Int32FromInt32(20))
					}
				} else {
					nNew = int16(10)
				}
				if int32(nNew) < nOut {
					nOut = int32(nNew)
				}
			}
		} else {
			**(**int32)(__ccgo_up(bp + 32)) = 0
			rc = _whereRangeSkipScanEst(tls, pParse, pLower, pUpper, pLoop, bp+32)
			if **(**int32)(__ccgo_up(bp + 32)) != 0 {
				return rc
			}
		}
	}
	nNew = _whereRangeAdjust(tls, pLower, int16(nOut))
	nNew = _whereRangeAdjust(tls, pUpper, nNew)
	/* TUNING: If there is both an upper and lower limit and neither limit
	 ** has an application-defined likelihood(), assume the range is
	 ** reduced by an additional 75%. This means that, by default, an open-ended
	 ** range query (e.g. col > ?) is assumed to match 1/4 of the rows in the
	 ** index. While a closed range (e.g. col BETWEEN ? AND ?) is estimated to
	 ** match 1/64 of the index. */
	if pLower != 0 && int32((*TWhereTerm)(unsafe.Pointer(pLower)).FtruthProb) > 0 && pUpper != 0 && int32((*TWhereTerm)(unsafe.Pointer(pUpper)).FtruthProb) > 0 {
		nNew = int16(int32(nNew) - libc.Int32FromInt32(20))
	}
	nOut = nOut - (libc.BoolInt32(pLower != uintptr(0)) + libc.BoolInt32(pUpper != uintptr(0)))
	if int32(nNew) < int32(10) {
		nNew = int16(10)
	}
	if int32(nNew) < nOut {
		nOut = int32(nNew)
	}
	(*TWhereLoop)(unsafe.Pointer(pLoop)).FnOut = int16(nOut)
	return rc
}