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btree.c
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#include <btree.h>
#include <string.h>
static bool imcs_next_tile(imcs_iterator_h iterator)
{
imcs_iterator_context_t* ctx = (imcs_iterator_context_t*)iterator->context;
int i = ctx->stack_size-1;
if (i >= 0 && iterator->next_pos <= iterator->last_pos) {
imcs_page_t* pg;
size_t tile_size = 0, n_vals;
while (true) {
size_t inc = 0;
while (true) {
pg = ctx->stack[i].page;
ctx->stack[i].pos += inc;
if (ctx->stack[i].pos == pg->n_items) {
inc = 1;
if (--i < 0) {
ctx->stack_size = 0;
if (tile_size == 0) {
return false;
} else {
iterator->tile_size = tile_size;
return true;
}
}
} else {
Assert(pg->n_items > ctx->stack[i].pos);
break;
}
}
while (!pg->is_leaf) {
ctx->stack[i+1].page = CHILD(pg, ctx->stack[i].pos).page;
ctx->stack[++i].pos = 0;
pg = ctx->stack[i].page;
}
Assert(pg->n_items > ctx->stack[i].pos);
n_vals = pg->n_items - ctx->stack[i].pos;
if (n_vals - 1 > iterator->last_pos - iterator->next_pos) {
n_vals = (size_t)(iterator->last_pos - iterator->next_pos + 1);
}
if (n_vals > imcs_tile_size - tile_size) {
n_vals = imcs_tile_size - tile_size;
}
memcpy(&iterator->tile.arr_char[tile_size*iterator->elem_size], &pg->u.val_char[ctx->stack[i].pos*iterator->elem_size], n_vals*iterator->elem_size);
iterator->next_pos += n_vals;
ctx->stack[i].pos += n_vals;
ctx->stack_size = i + 1;
tile_size += n_vals;
if (tile_size == imcs_tile_size || iterator->next_pos > iterator->last_pos) {
iterator->tile_size = tile_size;
return true;
}
}
}
return false;
}
static bool imcs_subseq_page(imcs_iterator_h iterator, imcs_page_t* pg, imcs_pos_t from, int level)
{
imcs_iterator_context_t* ctx = (imcs_iterator_context_t*)iterator->context;
int n_items;
Assert(level < IMCS_STACK_SIZE);
ctx->stack[level].page = pg;
n_items = pg->n_items;
Assert(n_items > 0);
if (!pg->is_leaf) {
int i;
for (i = 0; i < n_items; i++) {
imcs_count_t count = CHILD(pg, i).count;
if (from < count) {
imcs_page_t* child = CHILD(pg, i).page;
ctx->stack[level].pos = i;
return imcs_subseq_page(iterator, child, from, level+1);
}
from -= count;
}
} else {
if (from < (imcs_pos_t)n_items) {
ctx->stack[level].pos = (int)from;
ctx->stack_size = level+1;
return true;
}
}
return false;
}
static void imcs_reset_tree_iterator(imcs_iterator_h iterator)
{
imcs_iterator_context_t* ctx = (imcs_iterator_context_t*)iterator->context;
imcs_subseq_page(iterator, ctx->stack[0].page, iterator->first_pos, 0);
imcs_reset_iterator(iterator);
}
void imcs_subseq_random_access_iterator(imcs_iterator_h iterator, imcs_pos_t from, imcs_pos_t till)
{
imcs_timeseries_t* ts = iterator->cs_hdr;
Assert(iterator->last_pos != IMCS_INFINITY);
from = ((int64)from < 0) ? iterator->last_pos + from + 1 : iterator->first_pos + from;
till = ((int64)till < 0) ? iterator->last_pos + till + 1 : iterator->first_pos + till;
if (from < iterator->first_pos) {
from = iterator->first_pos;
}
if (till > iterator->last_pos) {
till = iterator->last_pos;
}
if (till >= from && (ts == NULL || (ts->root_page != NULL && imcs_subseq_page(iterator, ts->root_page, from, 0)))) {
iterator->first_pos = iterator->next_pos = from;
iterator->last_pos = till;
} else {
iterator->first_pos = iterator->next_pos = 1;
iterator->last_pos = 0;
}
}
imcs_iterator_h imcs_subseq(imcs_timeseries_t* ts, imcs_pos_t from, imcs_pos_t till)
{
imcs_iterator_t* iterator = (imcs_iterator_t*)imcs_new_iterator(ts->elem_size, sizeof(imcs_iterator_context_t));
iterator->cs_hdr = ts;
iterator->elem_type = ts->elem_type;
iterator->flags = FLAG_CONTEXT_FREE|FLAG_RANDOM_ACCESS;
iterator->reset = imcs_reset_tree_iterator;
iterator->next = imcs_next_tile;
if (till >= from && ts->root_page != NULL && imcs_subseq_page(iterator, ts->root_page, from, 0)) {
iterator->first_pos = iterator->next_pos = from;
iterator->last_pos = till >= ts->count ? ts->count-1 : till;
} else {
iterator->first_pos = iterator->next_pos = 1;
iterator->last_pos = 0;
}
return iterator;
}
static bool imcs_map_next(imcs_iterator_h iterator)
{
size_t i, tile_size;
imcs_iterator_context_t* ctx = (imcs_iterator_context_t*)iterator->context;
size_t elem_size = iterator->elem_size;
size_t prev_page_size = 0;
imcs_pos_t prev_page_pos = 0;
imcs_iterator_h map = iterator->opd[0];
if (!map->next(map)) {
return false;
}
tile_size = map->tile_size;
for (i = 0; i < tile_size; i++) {
imcs_pos_t next_pos = iterator->first_pos + map->tile.arr_int64[i];
imcs_page_t* pg;
if (next_pos - prev_page_pos >= prev_page_size) {
if (!imcs_subseq_page(iterator, ctx->stack[0].page, next_pos, 0)) {
return false;
}
prev_page_pos = next_pos - ctx->stack[ctx->stack_size-1].pos;
}
pg = ctx->stack[ctx->stack_size-1].page;
prev_page_size = pg->n_items;
Assert(next_pos - prev_page_pos < prev_page_size);
memcpy(&iterator->tile.arr_char[i*elem_size], &pg->u.val_char[((size_t)(next_pos - prev_page_pos))*elem_size], elem_size);
}
iterator->next_pos += tile_size;
iterator->tile_size = tile_size;
return true;
}
imcs_iterator_h imcs_map(imcs_iterator_h input, imcs_iterator_h map_iterator)
{
imcs_timeseries_t* ts = input->cs_hdr;
imcs_iterator_h iterator = imcs_new_iterator(ts->elem_size, sizeof(imcs_iterator_context_t));
imcs_iterator_context_t* ctx = (imcs_iterator_context_t*)iterator->context;
iterator->elem_type = ts->elem_type;
iterator->flags = FLAG_CONTEXT_FREE;
iterator->next = imcs_map_next;
iterator->opd[0] = map_iterator;
iterator->first_pos = iterator->next_pos = input->first_pos;
ctx->stack[0].page = ts->root_page;
return iterator;
}
#define IMCS_IMPLEMENTATIONS(TYPE) \
bool imcs_first_##TYPE(imcs_timeseries_t* ts, TYPE* val) \
{ \
imcs_page_t* pg = ts->root_page; \
if (pg == NULL) { \
return false; \
} \
while (!pg->is_leaf) { \
pg = CHILD(pg, 0).page; \
} \
*val = pg->u.val_##TYPE[0]; \
return true; \
} \
bool imcs_last_##TYPE(imcs_timeseries_t* ts, TYPE* val) \
{ \
imcs_page_t* pg = ts->root_page; \
if (pg == NULL) { \
return false; \
} \
while (!pg->is_leaf) { \
pg = CHILD(pg, pg->n_items-1).page; \
} \
*val = pg->u.val_##TYPE[pg->n_items-1]; \
return true; \
} \
/* return false on overflow */ \
static bool imcs_append_page_##TYPE(imcs_page_t** root_page, TYPE val, bool is_timestamp) \
{ \
imcs_page_t* pg = *root_page; \
int n_items = pg->n_items; \
Assert(n_items > 0); \
if (is_timestamp && pg->u.val_##TYPE[n_items-1] > val) { \
ereport(ERROR, (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE), errmsg("value out of timeseries order"))); \
} \
if (!pg->is_leaf) { \
imcs_page_t* child = CHILD(pg, n_items-1).page; \
if (!imcs_append_page_##TYPE(&child, val, is_timestamp)) { \
if (n_items == MAX_NODE_ITEMS(TYPE)) { \
imcs_page_t* new_page = imcs_new_page(); \
*root_page = new_page; \
new_page->is_leaf = false; \
new_page->n_items = 1; \
CHILD(new_page, 0).page = child; \
CHILD(new_page, 0).count = 1; \
if (is_timestamp) { \
new_page->u.val_##TYPE[0] = val; \
} \
return false; \
} else { \
CHILD(pg, n_items).page = child; \
CHILD(pg, n_items).count = 1; \
if (is_timestamp) { \
pg->u.val_##TYPE[n_items] = val; \
} \
pg->n_items += 1; \
} \
} else { \
CHILD(pg, n_items-1).count += 1; \
} \
} else { \
int max_items = MAX_LEAF_ITEMS(TYPE); \
Assert(n_items <= max_items); \
if (n_items == max_items) { \
imcs_page_t* new_page = imcs_new_page(); \
*root_page = new_page; \
new_page->is_leaf = true; \
new_page->u.val_##TYPE[0] = val; \
new_page->n_items = 1; \
return false; \
} else { \
pg->u.val_##TYPE[n_items] = val; \
pg->n_items += 1; \
} \
} \
return true; \
} \
\
void imcs_append_##TYPE(imcs_timeseries_t* ts, TYPE val) \
{ \
if (ts->root_page == 0) { \
ts->root_page = imcs_new_page(); \
ts->root_page->is_leaf = true; \
ts->root_page->u.val_##TYPE[0] = val; \
ts->count = ts->root_page->n_items = 1; \
} else { \
imcs_page_t* root_page = ts->root_page; \
if (!imcs_append_page_##TYPE(&root_page, val, ts->is_timestamp)) { \
imcs_page_t* new_root = imcs_new_page(); \
new_root->is_leaf = false; \
new_root->n_items = 2; \
CHILD(new_root, 0).page = ts->root_page; \
CHILD(new_root, 0).count = ts->count; \
CHILD(new_root, 1).page = root_page; \
CHILD(new_root, 1).count = 1; \
if (ts->is_timestamp) { \
new_root->u.val_##TYPE[0] = ts->root_page->u.val_##TYPE[0]; \
new_root->u.val_##TYPE[1] = val; \
} \
ts->root_page = new_root; \
} \
ts->count += 1; \
} \
} \
static bool imcs_search_page_##TYPE(imcs_page_t* pg, imcs_iterator_h iterator, TYPE val, imcs_boundary_kind_t boundary, int level) \
{ \
int i, l, r, n_items; \
imcs_iterator_context_t* ctx = (imcs_iterator_context_t*)iterator->context; \
bool found = false; \
Assert(level < IMCS_STACK_SIZE); \
ctx->stack[level].page = pg; \
n_items = pg->n_items; \
Assert(n_items > 0); \
l = 0; \
r = n_items; \
if (boundary == BOUNDARY_INCLUSIVE) { \
while (l < r) { \
int m = (l + r) >> 1; \
if (pg->u.val_##TYPE[m] < val) { \
l = m + 1; \
} else { \
r = m; \
} \
} \
} else if (boundary == BOUNDARY_EXCLUSIVE) { \
while (l < r) { \
int m = (l + r) >> 1; \
if (pg->u.val_##TYPE[m] <= val) { \
l = m + 1; \
} else { \
r = m; \
} \
} \
} \
if (!pg->is_leaf) { \
if (l > 0) { \
found = imcs_search_page_##TYPE(CHILD(pg, l-1).page, iterator, val, boundary, level+1); \
if (found) { \
l -= 1; \
} \
} \
if (!found && l < n_items) { \
found = imcs_search_page_##TYPE(CHILD(pg, l).page, iterator, val, boundary, level+1); \
} \
if (found) { \
for (i = 0; i < l; i++) { \
iterator->next_pos += CHILD(pg, i).count; \
} \
ctx->stack[level].pos = l; \
} \
} else { \
if (l < n_items) { \
iterator->next_pos += l; \
ctx->stack[level].pos = l; \
ctx->stack_size = level+1; \
found = true; \
} \
} \
return found; \
} \
\
imcs_iterator_h imcs_search_##TYPE(imcs_timeseries_t* ts, TYPE low, imcs_boundary_kind_t low_boundary, TYPE high, imcs_boundary_kind_t high_boundary) \
{ \
imcs_iterator_h iterator = imcs_new_iterator(sizeof(TYPE), sizeof(imcs_iterator_context_t)); \
iterator->reset = imcs_reset_tree_iterator; \
iterator->next = imcs_next_tile; \
iterator->elem_type = ts->elem_type; \
iterator->cs_hdr = ts; \
iterator->flags = FLAG_CONTEXT_FREE|FLAG_RANDOM_ACCESS; \
if (ts->root_page != NULL) { \
if (high_boundary != BOUNDARY_OPEN) { \
iterator->next_pos = 0; \
if (!imcs_search_page_##TYPE(ts->root_page, iterator, high, BOUNDARY_INCLUSIVE + BOUNDARY_EXCLUSIVE - high_boundary, 0)) { \
iterator->last_pos = ts->count-1; \
} else { \
if (iterator->next_pos == 0) { \
iterator->first_pos = iterator->next_pos = 1; \
iterator->last_pos = 0; \
} else { \
iterator->last_pos = iterator->next_pos - 1; \
} \
} \
} else { \
iterator->last_pos = ts->count-1; \
} \
iterator->next_pos = 0; \
if (imcs_search_page_##TYPE(ts->root_page, iterator, low, low_boundary, 0)) { \
if (iterator->next_pos <= iterator->last_pos) { \
iterator->first_pos = iterator->next_pos; \
return iterator; \
} \
} \
} \
iterator->first_pos = iterator->next_pos = 1; \
iterator->last_pos = 0; \
return iterator; \
} \
IMCS_IMPLEMENTATIONS(int8)
IMCS_IMPLEMENTATIONS(int16)
IMCS_IMPLEMENTATIONS(int32)
IMCS_IMPLEMENTATIONS(int64)
IMCS_IMPLEMENTATIONS(float)
IMCS_IMPLEMENTATIONS(double)
static bool imcs_append_page_char(imcs_page_t** root_page, char const* val, size_t val_len, size_t elem_size)
{
imcs_page_t* pg = *root_page;
int n_items = pg->n_items;
Assert(n_items > 0);
if (!pg->is_leaf) {
imcs_page_t* child = CHILD(pg, n_items-1).page;
if (!imcs_append_page_char(&child, val, val_len, elem_size)) {
if (n_items == MAX_NODE_ITEMS_CHAR(elem_size)) {
imcs_page_t* new_page = imcs_new_page();
*root_page = new_page;
new_page->is_leaf = false;
new_page->n_items = 1;
CHILD(new_page, 0).page = child;
CHILD(new_page, 0).count = 1;
return false;
} else {
CHILD(pg, n_items).page = child;
CHILD(pg, n_items).count = 1;
pg->n_items += 1;
}
} else {
CHILD(pg, n_items-1).count += 1;
}
} else {
int max_items = MAX_LEAF_ITEMS_CHAR(elem_size);
Assert(n_items <= max_items);
if (n_items == max_items) {
imcs_page_t* new_page = imcs_new_page();
*root_page = new_page;
new_page->is_leaf = true;
memcpy(new_page->u.val_char, val, val_len);
memset(new_page->u.val_char + val_len, '\0', elem_size - val_len);
new_page->n_items = 1;
return false;
} else {
memcpy(&pg->u.val_char[n_items*elem_size], val, val_len);
memset(&pg->u.val_char[n_items*elem_size] + val_len, '\0', elem_size - val_len);
pg->n_items += 1;
}
}
return true;
}
void imcs_append_char(imcs_timeseries_t* ts, char const* val, size_t val_len)
{
Assert(!ts->is_timestamp);
if (ts->root_page == 0) {
ts->root_page = imcs_new_page();
ts->root_page->is_leaf = true;
memcpy(ts->root_page->u.val_char, val, val_len);
memset(ts->root_page->u.val_char + val_len, 0, ts->elem_size - val_len);
ts->count = ts->root_page->n_items = 1;
} else {
imcs_page_t* root_page = ts->root_page;
if (!imcs_append_page_char(&root_page, val, val_len, ts->elem_size)) {
imcs_page_t* new_root = imcs_new_page();
new_root->is_leaf = false;
new_root->n_items = 2;
CHILD(new_root, 0).page = ts->root_page;
CHILD(new_root, 0).count = ts->count;
CHILD(new_root, 1).page = root_page;
CHILD(new_root, 1).count = 1;
ts->root_page = new_root;
}
ts->count += 1;
}
}
/* returns fals euon underflow */
static bool imcs_delete_page(imcs_timeseries_t* ts, imcs_page_t* pg, imcs_pos_t from, imcs_pos_t till)
{
int n_items = pg->n_items;
int elem_size = ts->elem_size;
if (!pg->is_leaf) {
int i;
for (i = 0; i < n_items; i++) {
imcs_count_t count = CHILD(pg, i).count;
if (from < count) {
int j = i;
do {
count = CHILD(pg, i).count;
if (imcs_delete_page(ts, CHILD(pg, i).page, from, till)) {
if (till < count) {
CHILD(pg, i).count -= till - from + 1;
break;
}
CHILD(pg, i).count = from;
j = i + 1;
from = 0;
} else {
if (till < count) {
i += 1;
break;
}
}
till -= count;
} while (++i < n_items);
if (i != j) {
MOVE_CHILDREN(pg, j, pg, i, n_items-i);
if (ts->is_timestamp) {
memmove(&pg->u.val_char[j*elem_size], &pg->u.val_char[i*elem_size], (n_items-i)*elem_size);
}
pg->n_items -= i - j;
if (pg->n_items == 0) {
imcs_free_page(pg);
return false;
}
}
break;
} else {
from -= count;
till -= count;
}
}
} else {
if (till >= (imcs_pos_t)n_items) {
till = n_items-1;
}
ts->count -= till - from + 1;
if ((int)(till - from + 1) == n_items) {
imcs_free_page(pg);
return false;
} else {
memmove(&pg->u.val_char[from*elem_size], &pg->u.val_char[(till+1)*elem_size], (n_items-till-1)*elem_size);
pg->n_items -= till - from + 1;
}
}
return true;
}
void imcs_delete(imcs_timeseries_t* ts, imcs_pos_t from, imcs_pos_t till)
{
imcs_page_t* root_page = ts->root_page;
if (root_page != NULL) {
if (!imcs_delete_page(ts, root_page, from, till)) {
Assert(ts->count == 0);
ts->root_page = NULL;
}
}
}
static void imcs_prune(imcs_page_t* pg)
{
if (!pg->is_leaf) {
int i, n;
for (i = 0, n = pg->n_items; i < n; i++) {
imcs_prune(CHILD(pg, i).page);
}
}
imcs_free_page(pg);
}
imcs_count_t imcs_delete_all(imcs_timeseries_t* ts)
{
imcs_page_t* root_page = ts->root_page;
imcs_count_t count = ts->count;
if (root_page != NULL) {
imcs_prune(root_page);
ts->root_page = NULL;
}
ts->count = 0;
return count;
}