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chunk2.go
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chunk2.go
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package duckdb
/*
#include <duckdb.h>
*/
import "C"
import (
"sync"
"unsafe"
)
type UDFDataChunk struct {
Columns []Vector
Capacity int
chunk C.duckdb_data_chunk
}
type Vector struct {
vector C.duckdb_vector
childVec *Vector
pos int
data unsafe.Pointer
bitmask *C.uint64_t
}
func AppendUUID(d *Vector, v []byte) {
Append(d, HugeInt(uuidToHugeInt(UUID(v))))
}
func AppendNull(d *Vector) {
C.duckdb_validity_set_row_invalid(d.bitmask, C.uint64_t(d.pos))
d.pos++
}
func AppendBytes(d *Vector, v []byte) {
sz := len(v)
if sz > 0 {
cstr := (*C.char)(unsafe.Pointer(&v[0]))
C.duckdb_vector_assign_string_element_len(d.vector, C.uint64_t(d.pos), cstr, C.idx_t(sz))
} else {
C.duckdb_vector_assign_string_element_len(d.vector, C.uint64_t(d.pos), nil, C.idx_t(0))
}
d.pos++
}
func vectorData[T any](vec *Vector) []T {
return (*[1 << 31]T)(vec.data)[:]
}
func (d *Vector) Child() *Vector {
return d.childVec
}
var chunkPool = sync.Pool{
New: func() any {
return &UDFDataChunk{}
},
}
func chunkSize(chunk C.duckdb_data_chunk) int {
return int(C.duckdb_data_chunk_get_size(chunk))
}
func (d *Vector) SetListSize(newLength int) {
C.duckdb_list_vector_set_size(d.vector, C.idx_t(newLength))
}
func (d *Vector) ReserveListSize(newLength int) {
C.duckdb_list_vector_reserve(d.vector, C.idx_t(newLength))
}
func (d *Vector) AppendListEntry(n int) {
entry := C.duckdb_list_entry{
offset: C.idx_t(d.childVec.pos),
length: C.idx_t(n),
}
Append(d, entry)
}
func Append[T validTypes](vec *Vector, v T) {
arr := (*[1 << 31]T)(vec.data)
arr[vec.pos] = v
vec.pos++
}
func AppendMany[T validTypes](vec *Vector, v []T) {
vec.pos += rawCopy(vec, v)
}
func rawCopy[T any](vec *Vector, v []T) int {
return copy(vectorData[T](vec), v)
}
func (d *Vector) init(sz int, v C.duckdb_vector, writable bool) {
logicalType := C.duckdb_vector_get_column_type(v)
duckdbType := C.duckdb_get_type_id(logicalType)
C.duckdb_destroy_logical_type(&logicalType)
d.pos = 0
d.vector = v
d.data = C.duckdb_vector_get_data(v)
if duckdbType == C.DUCKDB_TYPE_LIST {
d.childVec = acquireVector(sz, C.duckdb_list_vector_get_child(d.vector))
} else if writable {
C.duckdb_vector_ensure_validity_writable(v)
d.bitmask = C.duckdb_vector_get_validity(v)
}
}
func acquireVector(sz int, v C.duckdb_vector) *Vector {
vec := vectorPool.Get().(*Vector)
vec.init(sz, v, true)
return vec
}
func releaseVector(v *Vector) {
vectorPool.Put(v)
}
var vectorPool = sync.Pool{
New: func() any {
return &Vector{}
},
}
func acquireChunk(vecSize int, chunk C.duckdb_data_chunk) *UDFDataChunk {
cols := int(C.duckdb_data_chunk_get_column_count(chunk))
c := chunkPool.Get().(*UDFDataChunk)
c.chunk = chunk
if cap(c.Columns) < cols {
c.Columns = make([]Vector, cols)
}
c.Columns = c.Columns[:cols]
c.Capacity = vecSize
for i := range c.Columns {
c.Columns[i].init(vecSize, C.duckdb_data_chunk_get_vector(chunk, C.uint64_t(i)), true)
}
return c
}
func releaseChunk(ch *UDFDataChunk) {
for i := range ch.Columns {
if ch.Columns[i].childVec != nil {
releaseVector(ch.Columns[i].childVec)
ch.Columns[i].childVec = nil
}
}
chunkPool.Put(ch)
}
func b2s(b []byte) string {
return unsafe.String(unsafe.SliceData(b), len(b))
}
func s2b(s string) []byte {
return unsafe.Slice(unsafe.StringData(s), len(s))
}