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jsonb_gin_ops.c
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#include "postgres.h"
#include "access/hash.h"
#include "access/skey.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_type.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/jsonb.h"
#include "jsquery.h"
typedef struct PathHashStack
{
uint32 hash;
struct PathHashStack *parent;
} PathHashStack;
typedef struct
{
int32 vl_len_;
uint32 hash;
uint8 type;
char data[1];
} GINKey;
#define GINKEYLEN offsetof(GINKey, data)
#define GINKeyLenString (INTALIGN(offsetof(GINKey, data)) + sizeof(uint32))
#define GINKeyLenNumeric(len) (INTALIGN(offsetof(GINKey, data)) + len)
#define GINKeyDataString(key) (*(uint32 *)((Pointer)key + INTALIGN(offsetof(GINKey, data))))
#define GINKeyDataNumeric(key) ((Pointer)key + INTALIGN(offsetof(GINKey, data)))
#define GINKeyType(key) ((key)->type & 0x7F)
#define GINKeyIsTrue(key) ((key)->type & 0x80)
#define GINKeyTrue 0x80
#define BLOOM_BITS 2
#define JsonbNestedContainsStrategyNumber 13
#define JsQueryMatchStrategyNumber 14
typedef struct
{
Datum *entries;
Pointer *extra_data;
bool *partial_match;
int *map;
int count, total;
} Entries;
typedef struct
{
ExtractedNode *root;
uint32 hash;
bool lossy;
bool inequality, leftInclusive, rightInclusive;
GINKey *rightBound;
} KeyExtra;
static uint32 get_bloom_value(uint32 hash);
static uint32 get_path_bloom(PathHashStack *stack);
static GINKey *make_gin_key(JsonbValue *v, uint32 hash);
static GINKey *make_gin_query_key(JsQueryValue *value, uint32 hash);
static GINKey *make_gin_query_key_minus_inf(uint32 hash);
static int32 compare_gin_key_value(GINKey *arg1, GINKey *arg2);
static int add_entry(Entries *e, Datum key, Pointer extra, bool pmatch);
PG_FUNCTION_INFO_V1(gin_compare_jsonb_bloom_value);
PG_FUNCTION_INFO_V1(gin_compare_partial_jsonb_bloom_value);
PG_FUNCTION_INFO_V1(gin_extract_jsonb_bloom_value);
PG_FUNCTION_INFO_V1(gin_extract_jsonb_query_bloom_value);
PG_FUNCTION_INFO_V1(gin_consistent_jsonb_bloom_value);
PG_FUNCTION_INFO_V1(gin_triconsistent_jsonb_bloom_value);
Datum gin_compare_jsonb_bloom_value(PG_FUNCTION_ARGS);
Datum gin_compare_partial_jsonb_bloom_value(PG_FUNCTION_ARGS);
Datum gin_extract_jsonb_bloom_value(PG_FUNCTION_ARGS);
Datum gin_extract_jsonb_query_bloom_value(PG_FUNCTION_ARGS);
Datum gin_consistent_jsonb_bloom_value(PG_FUNCTION_ARGS);
Datum gin_triconsistent_jsonb_bloom_value(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(gin_compare_jsonb_hash_value);
PG_FUNCTION_INFO_V1(gin_compare_partial_jsonb_hash_value);
PG_FUNCTION_INFO_V1(gin_extract_jsonb_hash_value);
PG_FUNCTION_INFO_V1(gin_extract_jsonb_query_hash_value);
PG_FUNCTION_INFO_V1(gin_consistent_jsonb_hash_value);
PG_FUNCTION_INFO_V1(gin_triconsistent_jsonb_hash_value);
Datum gin_compare_jsonb_hash_value(PG_FUNCTION_ARGS);
Datum gin_compare_partial_jsonb_hash_value(PG_FUNCTION_ARGS);
Datum gin_extract_jsonb_hash_value(PG_FUNCTION_ARGS);
Datum gin_extract_jsonb_query_hash_value(PG_FUNCTION_ARGS);
Datum gin_consistent_jsonb_hash_value(PG_FUNCTION_ARGS);
Datum gin_triconsistent_jsonb_hash_value(PG_FUNCTION_ARGS);
static int
add_entry(Entries *e, Datum key, Pointer extra, bool pmatch)
{
int entryNum;
if (!e->entries)
{
e->total = 16;
e->entries = (Datum *)palloc(e->total * sizeof(Datum));
e->extra_data = (Pointer *)palloc(e->total * sizeof(Pointer));
e->partial_match = (bool *)palloc(e->total * sizeof(bool));
}
if (e->count + 1 > e->total)
{
e->total *= 2;
e->entries = (Datum *)repalloc(e->entries, e->total * sizeof(Datum));
e->extra_data = (Pointer *)repalloc(e->entries, e->total * sizeof(Pointer));
e->partial_match = (bool *)repalloc(e->entries, e->total * sizeof(bool));
}
entryNum = e->count;
e->count++;
e->entries[entryNum] = key;
e->extra_data[entryNum] = extra;
e->partial_match[entryNum] = pmatch;
return entryNum;
}
static uint32
get_bloom_value(uint32 hash)
{
int i, j, vals[BLOOM_BITS], val, tmp;
uint32 res = 0;
for (i = 0; i < BLOOM_BITS; i++)
{
val = hash % (32 - i) + i;
vals[i] = val;
j = i;
while (j > 0 && vals[j] <= vals[j - 1])
{
tmp = vals[j] - 1;
vals[j] = vals[j - 1];
vals[j - 1] = tmp;
j--;
}
}
for (i = 0; i < BLOOM_BITS; i++)
{
res |= (1 << vals[i]);
}
return res;
}
static uint32
get_path_bloom(PathHashStack *stack)
{
int i = 0;
uint32 res = 0, val;
while (stack)
{
uint32 hash = stack->hash;
val = get_bloom_value(hash);
res |= val;
i++;
stack = stack->parent;
}
return res;
}
static uint32
get_query_path_bloom(PathItem *pathItem, bool *lossy)
{
uint32 res = 0, val;
*lossy = false;
while (pathItem)
{
uint32 hash;
if (pathItem->type == iKey)
{
hash = hash_any((unsigned char *)pathItem->s, pathItem->len);
val = get_bloom_value(hash);
res |= val;
}
else if (pathItem->type == iAny)
{
*lossy = true;
}
pathItem = pathItem->parent;
}
return res;
}
#ifdef NOT_USED
static void
log_gin_key(GINKey *key)
{
if (GINKeyType(key) == jbvNull)
{
elog(NOTICE, "hash = %X, NULL", key->hash);
}
else if (GINKeyType(key) == jbvBool)
{
if (GINKeyIsTrue(key))
elog(NOTICE, "hash = %X, true", key->hash);
else
elog(NOTICE, "hash = %X, false", key->hash);
}
else if (GINKeyType(key) == jbvNumeric)
{
if (GINKeyIsTrue(key))
{
elog(NOTICE, "hash = %X, -inf", key->hash);
}
else
{
char *s;
s = DatumGetCString(DirectFunctionCall1(numeric_out, PointerGetDatum(GINKeyDataNumeric(key))));
elog(NOTICE, "hash = %X, \"%s\"", key->hash, s);
}
}
else if (GINKeyType(key) == jbvString)
{
elog(NOTICE, "hash = %X, %X", key->hash, GINKeyDataString(key));
}
else
{
elog(ERROR, "GINKey must be scalar");
}
}
#endif
static GINKey *
make_gin_key(JsonbValue *v, uint32 hash)
{
GINKey *key;
if (v->type == jbvNull)
{
key = (GINKey *)palloc(GINKEYLEN);
key->type = v->type;
SET_VARSIZE(key, GINKEYLEN);
}
else if (v->type == jbvBool)
{
key = (GINKey *)palloc(GINKEYLEN);
key->type = v->type | (v->val.boolean ? GINKeyTrue : 0);
SET_VARSIZE(key, GINKEYLEN);
}
else if (v->type == jbvNumeric)
{
key = (GINKey *)palloc(GINKeyLenNumeric(VARSIZE_ANY(v->val.numeric)));
key->type = v->type;
memcpy(GINKeyDataNumeric(key), v->val.numeric, VARSIZE_ANY(v->val.numeric));
SET_VARSIZE(key, GINKeyLenNumeric(VARSIZE_ANY(v->val.numeric)));
}
else if (v->type == jbvString)
{
key = (GINKey *)palloc(GINKeyLenString);
key->type = v->type;
GINKeyDataString(key) = hash_any((unsigned char *)v->val.string.val,
v->val.string.len);
SET_VARSIZE(key, GINKeyLenString);
}
else
{
elog(ERROR, "GINKey must be scalar");
}
key->hash = hash;
return key;
}
static GINKey *
make_gin_query_key(JsQueryValue *value, uint32 hash)
{
GINKey *key;
char *jqBase = value->jqBase;
int len, jqPos = value->jqPos;
Numeric numeric;
switch(value->type)
{
case jqiNull:
key = (GINKey *)palloc(GINKEYLEN);
key->type = jbvNull;
SET_VARSIZE(key, GINKEYLEN);
break;
case jqiString:
read_int32(len, jqBase, jqPos);
key = (GINKey *)palloc(GINKeyLenString);
key->type = jbvString;
GINKeyDataString(key) = hash_any((unsigned char *)jqBase + jqPos,
len);
SET_VARSIZE(key, GINKeyLenString);
break;
case jqiBool:
read_byte(len, jqBase, jqPos);
key = (GINKey *)palloc(GINKEYLEN);
key->type = jbvBool | (len ? GINKeyTrue : 0);
SET_VARSIZE(key, GINKEYLEN);
break;
case jqiNumeric:
numeric = (Numeric)(jqBase + jqPos);
key = (GINKey *)palloc(GINKeyLenNumeric(VARSIZE_ANY(numeric)));
key->type = jbvNumeric;
memcpy(GINKeyDataNumeric(key), numeric, VARSIZE_ANY(numeric));
SET_VARSIZE(key, GINKeyLenNumeric(VARSIZE_ANY(numeric)));
break;
default:
elog(ERROR,"Wrong state");
}
key->hash = hash;
return key;
}
static GINKey *
make_gin_query_key_minus_inf(uint32 hash)
{
GINKey *key;
key = (GINKey *)palloc(GINKEYLEN);
key->type = jbvNumeric | GINKeyTrue;
key->hash = hash;
SET_VARSIZE(key, GINKEYLEN);
return key;
}
static int
make_bloom_entry_handler(ExtractedNode *node, Pointer extra)
{
Entries *e = (Entries *)extra;
uint32 hash;
bool lossy;
GINKey *key;
KeyExtra *keyExtra;
int result;
Assert(node->type == eScalar);
hash = get_query_path_bloom(node->path, &lossy);
keyExtra = (KeyExtra *)palloc(sizeof(KeyExtra));
keyExtra->hash = hash;
keyExtra->lossy = lossy;
keyExtra->inequality = node->bounds.inequality;
if (!node->bounds.inequality)
{
if (node->bounds.exact->type == jqiAny)
return -1;
key = make_gin_query_key(node->bounds.exact, lossy ? 0 : hash);
}
else
{
if (node->bounds.leftBound)
{
key = make_gin_query_key(node->bounds.leftBound, lossy ? 0 : hash);
keyExtra->leftInclusive = node->bounds.leftInclusive;
}
else
{
key = make_gin_query_key_minus_inf(lossy ? 0 : hash);
keyExtra->leftInclusive = false;
}
if (node->bounds.rightBound)
{
keyExtra->rightBound = make_gin_query_key(node->bounds.rightBound, lossy ? 0 : hash);
keyExtra->rightInclusive = node->bounds.rightInclusive;
}
else
{
keyExtra->rightBound = NULL;
}
}
result = add_entry(e, PointerGetDatum(key), (Pointer)keyExtra,
lossy | node->bounds.inequality);
return result;
}
static int32
compare_gin_key_value(GINKey *arg1, GINKey *arg2)
{
if (GINKeyType(arg1) != GINKeyType(arg2))
{
return (GINKeyType(arg1) > GINKeyType(arg2)) ? 1 : -1;
}
else
{
switch(GINKeyType(arg1))
{
case jbvNull:
return 0;
case jbvBool:
if (GINKeyIsTrue(arg1) == GINKeyIsTrue(arg2))
return 0;
else if (GINKeyIsTrue(arg1) > GINKeyIsTrue(arg2))
return 1;
else
return -1;
case jbvNumeric:
if (GINKeyIsTrue(arg1))
{
if (GINKeyIsTrue(arg2))
return 0;
else
return -1;
}
else
{
if (GINKeyIsTrue(arg2))
return 1;
}
return DatumGetInt32(DirectFunctionCall2(numeric_cmp,
PointerGetDatum(GINKeyDataNumeric(arg1)),
PointerGetDatum(GINKeyDataNumeric(arg2))));
case jbvString:
if (GINKeyDataString(arg1) < GINKeyDataString(arg2))
return -1;
else if (GINKeyDataString(arg1) == GINKeyDataString(arg2))
return 0;
else
return 1;
default:
elog(ERROR, "GINKey must be scalar");
return 0;
}
}
}
Datum
gin_compare_jsonb_bloom_value(PG_FUNCTION_ARGS)
{
GINKey *arg1 = (GINKey *)PG_GETARG_VARLENA_P(0);
GINKey *arg2 = (GINKey *)PG_GETARG_VARLENA_P(1);
int32 result = 0;
result = compare_gin_key_value(arg1, arg2);
if (result == 0 && arg1->hash != arg2->hash)
{
result = (arg1->hash > arg2->hash) ? 1 : -1;
}
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_INT32(result);
}
Datum
gin_compare_partial_jsonb_bloom_value(PG_FUNCTION_ARGS)
{
GINKey *partial_key = (GINKey *)PG_GETARG_VARLENA_P(0);
GINKey *key = (GINKey *)PG_GETARG_VARLENA_P(1);
StrategyNumber strategy = PG_GETARG_UINT16(2);
int32 result;
if (strategy == JsQueryMatchStrategyNumber)
{
KeyExtra *extra_data = (KeyExtra *)PG_GETARG_POINTER(3);
if (extra_data->inequality)
{
result = 0;
if (!extra_data->leftInclusive && compare_gin_key_value(key, partial_key) <= 0)
{
result = -1;
}
if (result == 0 && extra_data->rightBound)
{
result = compare_gin_key_value(key, extra_data->rightBound);
if ((extra_data->rightInclusive && result <= 0) || result < 0)
result = 0;
else
result = 1;
}
if (result == 0)
{
if ((key->hash & extra_data->hash) != extra_data->hash)
result = -1;
}
}
else
{
result = compare_gin_key_value(key, partial_key);
if (result == 0)
{
if (extra_data->lossy)
{
if ((key->hash & extra_data->hash) != extra_data->hash)
result = -1;
}
else
{
if (key->hash != extra_data->hash)
result = -1;
}
}
}
}
else
{
uint32 *extra_data = (uint32 *)PG_GETARG_POINTER(3);
uint32 bloom = *extra_data;
result = compare_gin_key_value(key, partial_key);
if (result == 0)
{
if ((key->hash & bloom) != bloom)
result = -1;
}
}
PG_FREE_IF_COPY(partial_key, 0);
PG_FREE_IF_COPY(key, 1);
PG_RETURN_INT32(result);
}
static Datum *
gin_extract_jsonb_bloom_value_internal(Jsonb *jb, int32 *nentries, uint32 **bloom)
{
int total = 2 * JB_ROOT_COUNT(jb);
JsonbIterator *it;
JsonbValue v;
PathHashStack *stack;
int i = 0,
r;
Datum *entries = NULL;
uint32 hash;
if (total == 0)
{
*nentries = 0;
return NULL;
}
entries = (Datum *) palloc(sizeof(Datum) * total);
if (bloom)
(*bloom) = (uint32 *) palloc(sizeof(uint32) * total);
it = JsonbIteratorInit(&jb->root);
stack = NULL;
while ((r = JsonbIteratorNext(&it, &v, false)) != WJB_DONE)
{
PathHashStack *tmp;
if (i >= total)
{
total *= 2;
entries = (Datum *) repalloc(entries, sizeof(Datum) * total);
if (bloom)
(*bloom) = (uint32 *) repalloc(*bloom, sizeof(uint32) * total);
}
switch (r)
{
case WJB_BEGIN_OBJECT:
tmp = stack;
stack = (PathHashStack *) palloc(sizeof(PathHashStack));
stack->parent = tmp;
break;
case WJB_KEY:
stack->hash = 0;
JsonbHashScalarValue(&v, &stack->hash);
break;
case WJB_ELEM:
case WJB_VALUE:
if (bloom)
{
(*bloom)[i] = get_path_bloom(stack);
hash = 0;
}
else
{
hash = get_path_bloom(stack);
}
entries[i++] = PointerGetDatum(make_gin_key(&v, hash));
break;
case WJB_END_OBJECT:
/* Pop the stack */
tmp = stack->parent;
pfree(stack);
stack = tmp;
break;
case WJB_END_ARRAY:
case WJB_BEGIN_ARRAY:
break;
default:
elog(ERROR, "invalid JsonbIteratorNext rc: %d", r);
}
}
*nentries = i;
return entries;
}
Datum
gin_extract_jsonb_bloom_value(PG_FUNCTION_ARGS)
{
Jsonb *jb = PG_GETARG_JSONB(0);
int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
PG_RETURN_POINTER(gin_extract_jsonb_bloom_value_internal(jb, nentries, NULL));
}
Datum
gin_extract_jsonb_query_bloom_value(PG_FUNCTION_ARGS)
{
Jsonb *jb;
int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
StrategyNumber strategy = PG_GETARG_UINT16(2);
bool **pmatch = (bool **) PG_GETARG_POINTER(3);
Pointer **extra_data = (Pointer **) PG_GETARG_POINTER(4);
int32 *searchMode = (int32 *) PG_GETARG_POINTER(6);
Datum *entries = NULL;
int i, n;
uint32 *bloom;
Entries e = {0};
JsQuery *jq;
ExtractedNode *root;
switch(strategy)
{
case JsonbContainsStrategyNumber:
jb = PG_GETARG_JSONB(0);
entries = gin_extract_jsonb_bloom_value_internal(jb, nentries, NULL);
break;
case JsonbNestedContainsStrategyNumber:
jb = PG_GETARG_JSONB(0);
entries = gin_extract_jsonb_bloom_value_internal(jb, nentries, &bloom);
n = *nentries;
*pmatch = (bool *) palloc(sizeof(bool) * n);
for (i = 0; i < n; i++)
(*pmatch)[i] = true;
*extra_data = (Pointer *) palloc(sizeof(Pointer) * n);
for (i = 0; i < n; i++)
(*extra_data)[i] = (Pointer)&bloom[i];
break;
case JsQueryMatchStrategyNumber:
jq = PG_GETARG_JSQUERY(0);
root = extractJsQuery(jq, make_bloom_entry_handler, (Pointer)&e);
*nentries = e.count;
entries = e.entries;
*pmatch = e.partial_match;
*extra_data = e.extra_data;
for (i = 0; i < e.count; i++)
((KeyExtra *)e.extra_data[i])->root = root;
break;
default:
elog(ERROR, "unrecognized strategy number: %d", strategy);
break;
}
/* ...although "contains {}" requires a full index scan */
if (entries == NULL)
*searchMode = GIN_SEARCH_MODE_ALL;
PG_RETURN_POINTER(entries);
}
Datum
gin_consistent_jsonb_bloom_value(PG_FUNCTION_ARGS)
{
bool *check = (bool *) PG_GETARG_POINTER(0);
StrategyNumber strategy = PG_GETARG_UINT16(1);
/* Jsonb *query = PG_GETARG_JSONB(2); */
int32 nkeys = PG_GETARG_INT32(3);
Pointer *extra_data = (Pointer *) PG_GETARG_POINTER(4);
bool *recheck = (bool *) PG_GETARG_POINTER(5);
bool res = true;
int32 i;
*recheck = true;
switch (strategy)
{
case JsonbContainsStrategyNumber:
case JsonbNestedContainsStrategyNumber:
for (i = 0; i < nkeys; i++)
{
if (!check[i])
{
res = false;
break;
}
}
break;
case JsQueryMatchStrategyNumber:
if (nkeys == 0)
res = true;
else
res = execRecursive(((KeyExtra *)extra_data[0])->root, check);
break;
default:
elog(ERROR, "unrecognized strategy number: %d", strategy);
break;
}
PG_RETURN_BOOL(res);
}
Datum
gin_triconsistent_jsonb_bloom_value(PG_FUNCTION_ARGS)
{
GinTernaryValue *check = (GinTernaryValue *) PG_GETARG_POINTER(0);
StrategyNumber strategy = PG_GETARG_UINT16(1);
/* Jsonb *query = PG_GETARG_JSONB(2); */
int32 nkeys = PG_GETARG_INT32(3);
Pointer *extra_data = (Pointer *) PG_GETARG_POINTER(4);
GinTernaryValue res = GIN_TRUE;
int32 i;
bool has_maybe = false;
switch (strategy)
{
case JsonbContainsStrategyNumber:
case JsonbNestedContainsStrategyNumber:
/*
* All extracted keys must be present. A combination of GIN_MAYBE and
* GIN_TRUE induces a GIN_MAYBE result, because then all keys may be
* present.
*/
for (i = 0; i < nkeys; i++)
{
if (check[i] == GIN_FALSE)
{
res = GIN_FALSE;
break;
}
if (check[i] == GIN_MAYBE)
{
res = GIN_MAYBE;
has_maybe = true;
}
}
/*
* jsonb_hash_ops index doesn't have information about correspondence of
* Jsonb keys and values (as distinct from GIN keys, which for this opclass
* are a hash of a pair, or a hash of just an element), so invariably we
* recheck. This is also reflected in how GIN_MAYBE is given in response
* to there being no GIN_MAYBE input.
*/
if (!has_maybe && res == GIN_TRUE)
res = GIN_MAYBE;
break;
case JsQueryMatchStrategyNumber:
if (nkeys == 0)
res = GIN_MAYBE;
else
res = execRecursiveTristate(((KeyExtra *)extra_data[0])->root, check);
if (res == GIN_TRUE)
res = GIN_MAYBE;
break;
default:
elog(ERROR, "unrecognized strategy number: %d", strategy);
break;
}
PG_RETURN_GIN_TERNARY_VALUE(res);
}
static bool
get_query_path_hash(PathItem *pathItem, uint32 *hash)
{
check_stack_depth();
if (!pathItem)
return true;
if (!get_query_path_hash(pathItem->parent, hash))
{
return false;
}
else
{
if (pathItem->type == iAny)
{
return false;
}
else
{
if (pathItem->type == iKey)
{
*hash = (*hash << 1) | (*hash >> 31);
*hash ^= hash_any((unsigned char *)pathItem->s, pathItem->len);
}
else if (pathItem->type == iAnyArray)
{
*hash = (*hash << 1) | (*hash >> 31);
*hash ^= JB_FARRAY;
}
return true;
}
}
}
static int
make_hash_entry_handler(ExtractedNode *node, Pointer extra)
{
Entries *e = (Entries *)extra;
uint32 hash;
GINKey *key;
KeyExtra *keyExtra;
int result;
Assert(node->type == eScalar);
hash = 0;
if (!get_query_path_hash(node->path, &hash))
return -1;
keyExtra = (KeyExtra *)palloc(sizeof(KeyExtra));
keyExtra->hash = hash;
keyExtra->lossy = false;
keyExtra->inequality = node->bounds.inequality;
if (!node->bounds.inequality)
{
if (node->bounds.exact->type == jqiAny)
return -1;
key = make_gin_query_key(node->bounds.exact, hash);
}
else
{
if (node->bounds.leftBound)
{
key = make_gin_query_key(node->bounds.leftBound, hash);
keyExtra->leftInclusive = node->bounds.leftInclusive;
}
else
{
key = make_gin_query_key_minus_inf(hash);
keyExtra->leftInclusive = false;
}
if (node->bounds.rightBound)
{
keyExtra->rightBound = make_gin_query_key(node->bounds.rightBound, hash);
keyExtra->rightInclusive = node->bounds.rightInclusive;
}
else
{
keyExtra->rightBound = NULL;
}
}
result = add_entry(e, PointerGetDatum(key), (Pointer)keyExtra,
node->bounds.inequality);
return result;
}
Datum
gin_compare_jsonb_hash_value(PG_FUNCTION_ARGS)
{
GINKey *arg1 = (GINKey *)PG_GETARG_VARLENA_P(0);
GINKey *arg2 = (GINKey *)PG_GETARG_VARLENA_P(1);
int32 result = 0;
if (arg1->hash != arg2->hash)
{
result = (arg1->hash > arg2->hash) ? 1 : -1;
}
else
{
result = compare_gin_key_value(arg1, arg2);
}
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_INT32(result);
}
Datum
gin_compare_partial_jsonb_hash_value(PG_FUNCTION_ARGS)
{
GINKey *partial_key = (GINKey *)PG_GETARG_VARLENA_P(0);
GINKey *key = (GINKey *)PG_GETARG_VARLENA_P(1);
StrategyNumber strategy = PG_GETARG_UINT16(2);
int32 result;
if (key->hash != partial_key->hash)
{
result = (key->hash > partial_key->hash) ? 1 : -1;
}
else if (strategy == JsQueryMatchStrategyNumber)
{
KeyExtra *extra_data = (KeyExtra *)PG_GETARG_POINTER(3);
if (extra_data->inequality)
{
result = 0;
if (!extra_data->leftInclusive && compare_gin_key_value(key, partial_key) <= 0)
{
result = -1;
}
if (result == 0 && extra_data->rightBound)
{
result = compare_gin_key_value(key, extra_data->rightBound);
if ((extra_data->rightInclusive && result <= 0) || result < 0)
result = 0;
else
result = 1;
}
}
else
{
result = compare_gin_key_value(key, partial_key);
}
}
else
{
result = compare_gin_key_value(key, partial_key);
}
PG_FREE_IF_COPY(partial_key, 0);
PG_FREE_IF_COPY(key, 1);
PG_RETURN_INT32(result);
}
static Datum *
gin_extract_jsonb_hash_value_internal(Jsonb *jb, int32 *nentries)
{
int total = 2 * JB_ROOT_COUNT(jb);
JsonbIterator *it;
JsonbValue v;
PathHashStack tail;
PathHashStack *stack;
int i = 0,
r;
Datum *entries = NULL;
if (total == 0)
{
*nentries = 0;
return NULL;
}
entries = (Datum *) palloc(sizeof(Datum) * total);
it = JsonbIteratorInit(&jb->root);
tail.parent = NULL;
tail.hash = 0;
stack = &tail;
while ((r = JsonbIteratorNext(&it, &v, false)) != WJB_DONE)
{
PathHashStack *tmp;
if (i >= total)
{
total *= 2;
entries = (Datum *) repalloc(entries, sizeof(Datum) * total);
}
switch (r)
{
case WJB_BEGIN_ARRAY:
case WJB_BEGIN_OBJECT:
tmp = stack;
stack = (PathHashStack *) palloc(sizeof(PathHashStack));
stack->parent = tmp;
stack->hash = stack->parent->hash;
if (r == WJB_BEGIN_ARRAY)
{
stack->hash = (stack->hash << 1) | (stack->hash >> 31);
stack->hash ^= JB_FARRAY;
}
break;
case WJB_KEY:
/* Initialize hash from parent */
stack->hash = stack->parent->hash;
JsonbHashScalarValue(&v, &stack->hash);
break;
case WJB_ELEM:
case WJB_VALUE:
/* Element/value case */
entries[i++] = PointerGetDatum(make_gin_key(&v, stack->hash));
break;
case WJB_END_ARRAY:
case WJB_END_OBJECT:
/* Pop the stack */
tmp = stack->parent;
pfree(stack);
stack = tmp;
break;
default:
elog(ERROR, "invalid JsonbIteratorNext rc: %d", r);
}
}
*nentries = i;