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jsquery_op.c
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/*-------------------------------------------------------------------------
*
* jsquery_op.c
* Functions and operations over jsquery/jsonb datatypes
*
* Copyright (c) 2014, PostgreSQL Global Development Group
* Author: Teodor Sigaev <[email protected]>
*
* IDENTIFICATION
* contrib/jsquery/jsquery_op.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/pg_crc.h"
#if PG_VERSION_NUM >= 90500
/*
* We have to keep same checksum algorithm as in pre-9.5 in order to be
* pg_upgradeable.
*/
#define INIT_CRC32 INIT_LEGACY_CRC32
#define FIN_CRC32 FIN_LEGACY_CRC32
#define COMP_CRC32 COMP_LEGACY_CRC32
#endif
#include "jsquery.h"
typedef struct ResultAccum {
StringInfo buf;
bool missAppend;
JsonbParseState *jbArrayState;
} ResultAccum;
static bool recursiveExecute(JsQueryItem *jsq, JsonbValue *jb, JsQueryItem *jsqLeftArg,
ResultAccum *ra);
static void
appendResult(ResultAccum *ra, JsonbValue *jb)
{
if (ra == NULL || ra->missAppend == true)
return;
if (ra->jbArrayState == NULL)
pushJsonbValue(&ra->jbArrayState, WJB_BEGIN_ARRAY, NULL);
pushJsonbValue(&ra->jbArrayState, WJB_ELEM, jb);
}
static void
concatResult(ResultAccum *ra, JsonbParseState *a, JsonbParseState *b)
{
Jsonb *value;
JsonbIterator *it;
int32 r;
JsonbValue v;
Assert(a);
Assert(b);
ra->jbArrayState = a;
value = JsonbValueToJsonb(pushJsonbValue(&b, WJB_END_ARRAY, NULL));
it = JsonbIteratorInit(&value->root);
while((r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
if (r == WJB_ELEM)
pushJsonbValue(&ra->jbArrayState, WJB_ELEM, &v);
}
static int
compareNumeric(Numeric a, Numeric b)
{
return DatumGetInt32(
DirectFunctionCall2(
numeric_cmp,
PointerGetDatum(a),
PointerGetDatum(b)
)
);
}
#define jbvScalar jbvBinary
static int
JsonbType(JsonbValue *jb)
{
int type = jb->type;
if (jb->type == jbvBinary)
{
JsonbContainer *jbc = jb->val.binary.data;
if (jbc->header & JB_FSCALAR)
type = jbvScalar;
else if (jbc->header & JB_FOBJECT)
type = jbvObject;
else if (jbc->header & JB_FARRAY)
type = jbvArray;
else
elog(ERROR, "Unknown container type: 0x%08x", jbc->header);
}
return type;
}
static bool
recursiveAny(JsQueryItem *jsq, JsonbValue *jb, ResultAccum *ra)
{
bool res = false;
JsonbIterator *it;
int32 r;
JsonbValue v;
check_stack_depth();
it = JsonbIteratorInit(jb->val.binary.data);
while(res == false && (r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
{
if (r == WJB_KEY)
{
r = JsonbIteratorNext(&it, &v, true);
Assert(r == WJB_VALUE);
}
if (r == WJB_VALUE || r == WJB_ELEM)
{
/*
* we don't need actually store result, we may need to store whole
* object/array
*/
res = recursiveExecute(jsq, &v, NULL, ra);
if (res == false && v.type == jbvBinary)
res = recursiveAny(jsq, &v, ra);
}
}
return res;
}
static bool
recursiveAll(JsQueryItem *jsq, JsonbValue *jb, ResultAccum *ra)
{
bool res = true;
JsonbIterator *it;
int32 r;
JsonbValue v;
check_stack_depth();
it = JsonbIteratorInit(jb->val.binary.data);
while((r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
{
if (r == WJB_KEY)
{
r = JsonbIteratorNext(&it, &v, true);
Assert(r == WJB_VALUE);
}
if (r == WJB_VALUE || r == WJB_ELEM)
{
/*
* we don't need actually store result, we may need to store whole
* object/array
*/
if ((res = recursiveExecute(jsq, &v, NULL, ra)) == true)
{
if (v.type == jbvBinary)
res = recursiveAll(jsq, &v, ra);
}
if (res == false)
break;
}
}
return res;
}
static bool
checkScalarEquality(JsQueryItem *jsq, JsonbValue *jb)
{
int len;
char *s;
if (jsq->type == jqiAny)
return true;
if (jb->type == jbvBinary)
return false;
if ((int)jb->type != (int)jsq->type /* see enums */)
return false;
switch(jsq->type)
{
case jqiNull:
return true;
case jqiString:
s = jsqGetString(jsq, &len);
return (len == jb->val.string.len && memcmp(jb->val.string.val, s, len) == 0);
case jqiBool:
return (jb->val.boolean == jsqGetBool(jsq));
case jqiNumeric:
return (compareNumeric(jsqGetNumeric(jsq), jb->val.numeric) == 0);
default:
elog(ERROR,"Wrong state");
}
return false;
}
static bool
checkArrayEquality(JsQueryItem *jsq, JsonbValue *jb)
{
int32 r;
JsonbIterator *it;
JsonbValue v;
JsQueryItem elem;
if (!(jsq->type == jqiArray && JsonbType(jb) == jbvArray))
return false;
it = JsonbIteratorInit(jb->val.binary.data);
r = JsonbIteratorNext(&it, &v, true);
Assert(r == WJB_BEGIN_ARRAY);
if (v.val.array.nElems != jsq->array.nelems)
return false;
while((r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
{
if (r != WJB_ELEM)
continue;
jsqIterateArray(jsq, &elem);
if (checkScalarEquality(&elem, &v) == false)
return false;
}
return true;
}
static bool
checkScalarIn(JsQueryItem *jsq, JsonbValue *jb)
{
JsQueryItem elem;
if (jb->type == jbvBinary)
return false;
if (jsq->type != jqiArray)
return false;
while(jsqIterateArray(jsq, &elem))
if (checkScalarEquality(&elem, jb))
return true;
return false;
}
static bool
executeArrayOp(JsQueryItem *jsq, int32 op, JsonbValue *jb)
{
int32 r = 0; /* keep static analyzer quiet */
JsonbIterator *it;
JsonbValue v;
JsQueryItem elem;
bool res;
if (JsonbType(jb) != jbvArray)
return false;
if (jsq->type != jqiArray)
return false;
if (op == jqiContains)
{
while(jsqIterateArray(jsq, &elem))
{
res = false;
it = JsonbIteratorInit(jb->val.binary.data);
while(res == false && (r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
{
if (r == WJB_ELEM && checkScalarEquality(&elem, &v))
res = true;
}
if (res == false)
return false;
}
}
else
{
it = JsonbIteratorInit(jb->val.binary.data);
while((r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
{
if (r == WJB_ELEM)
{
res = false;
jsqIterateInit(jsq);
while(jsqIterateArray(jsq, &elem))
{
if (checkScalarEquality(&elem, &v))
{
if (op == jqiOverlap)
return true;
res = true;
break;
}
}
jsqIterateDestroy(jsq);
if (op == jqiContained && res == false)
return false;
}
}
if (op == jqiOverlap)
return false;
}
return true;
}
static bool
makeCompare(JsQueryItem *jsq, int32 op, JsonbValue *jb)
{
int res;
if (jb->type != jbvNumeric)
return false;
if (jsq->type != jqiNumeric)
return false;
res = compareNumeric(jb->val.numeric, jsqGetNumeric(jsq));
switch(op)
{
case jqiEqual:
return (res == 0);
case jqiLess:
return (res < 0);
case jqiGreater:
return (res > 0);
case jqiLessOrEqual:
return (res <= 0);
case jqiGreaterOrEqual:
return (res >= 0);
default:
elog(ERROR, "Unknown operation");
}
return false;
}
static bool
executeExpr(JsQueryItem *jsq, int32 op, JsonbValue *jb, JsQueryItem *jsqLeftArg)
{
bool res = false;
/*
* read arg type
*/
Assert(jsqGetNext(jsq, NULL) == false);
Assert(jsq->type == jqiAny || jsq->type == jqiString || jsq->type == jqiNumeric ||
jsq->type == jqiNull || jsq->type == jqiBool || jsq->type == jqiArray);
if (jsqLeftArg && jsqLeftArg->type == jqiLength)
{
if (JsonbType(jb) == jbvArray || JsonbType(jb) == jbvObject)
{
int32 length;
JsonbIterator *it;
JsonbValue v;
int r;
it = JsonbIteratorInit(jb->val.binary.data);
r = JsonbIteratorNext(&it, &v, true);
Assert(r == WJB_BEGIN_ARRAY || r == WJB_BEGIN_OBJECT);
length = (r == WJB_BEGIN_ARRAY) ? v.val.array.nElems : v.val.object.nPairs;
v.type = jbvNumeric;
v.val.numeric = DatumGetNumeric(DirectFunctionCall1(int4_numeric, Int32GetDatum(length)));
switch(op)
{
case jqiEqual:
case jqiLess:
case jqiGreater:
case jqiLessOrEqual:
case jqiGreaterOrEqual:
res = makeCompare(jsq, op, &v);
break;
case jqiIn:
res = checkScalarIn(jsq, &v);
break;
case jqiOverlap:
case jqiContains:
case jqiContained:
break;
default:
elog(ERROR, "Unknown operation");
}
}
}
else
{
switch(op)
{
case jqiEqual:
if (JsonbType(jb) == jbvArray && jsq->type == jqiArray)
res = checkArrayEquality(jsq, jb);
else
res = checkScalarEquality(jsq, jb);
break;
case jqiIn:
res = checkScalarIn(jsq, jb);
break;
case jqiOverlap:
case jqiContains:
case jqiContained:
res = executeArrayOp(jsq, op, jb);
break;
case jqiLess:
case jqiGreater:
case jqiLessOrEqual:
case jqiGreaterOrEqual:
res = makeCompare(jsq, op, jb);
break;
default:
elog(ERROR, "Unknown operation");
}
}
return res;
}
static bool
recursiveExecute(JsQueryItem *jsq, JsonbValue *jb, JsQueryItem *jsqLeftArg,
ResultAccum *ra)
{
JsQueryItem elem;
bool res = false;
check_stack_depth();
switch(jsq->type) {
case jqiAnd:
{
JsonbParseState *saveJbArrayState = NULL;
jsqGetLeftArg(jsq, &elem);
if (ra && ra->missAppend == false)
{
saveJbArrayState = ra->jbArrayState;
ra->jbArrayState = NULL;
}
res = recursiveExecute(&elem, jb, jsqLeftArg, ra);
if (res == true)
{
jsqGetRightArg(jsq, &elem);
res = recursiveExecute(&elem, jb, jsqLeftArg, ra);
}
if (ra && ra->missAppend == false)
{
if (res == true)
{
if (saveJbArrayState != NULL)
/* append args lists to current */
concatResult(ra, saveJbArrayState, ra->jbArrayState);
}
else
ra->jbArrayState = saveJbArrayState;
}
break;
}
case jqiOr:
jsqGetLeftArg(jsq, &elem);
res = recursiveExecute(&elem, jb, jsqLeftArg, ra);
if (res == false)
{
jsqGetRightArg(jsq, &elem);
res = recursiveExecute(&elem, jb, jsqLeftArg, ra);
}
break;
case jqiNot:
{
bool saveMissAppend = (ra) ? ra->missAppend : true;
jsqGetArg(jsq, &elem);
if (ra)
ra->missAppend = true;
res = !recursiveExecute(&elem, jb, jsqLeftArg, ra);
if (ra)
ra->missAppend = saveMissAppend;
break;
}
case jqiKey:
if (JsonbType(jb) == jbvObject) {
JsonbValue *v, key;
key.type = jbvString;
key.val.string.val = jsqGetString(jsq, &key.val.string.len);
v = findJsonbValueFromContainer(jb->val.binary.data, JB_FOBJECT, &key);
if (v != NULL)
{
if (jsqGetNext(jsq, &elem) == false)
{
appendResult(ra, v);
res = true;
}
else
res = recursiveExecute(&elem, v, NULL, ra);
pfree(v);
}
}
break;
case jqiCurrent:
if (jsqGetNext(jsq, &elem) == false)
{
appendResult(ra, jb);
res = true;
}
else if (JsonbType(jb) == jbvScalar)
{
JsonbIterator *it;
int32 r PG_USED_FOR_ASSERTS_ONLY;
JsonbValue v;
it = JsonbIteratorInit(jb->val.binary.data);
r = JsonbIteratorNext(&it, &v, true);
Assert(r == WJB_BEGIN_ARRAY);
Assert(v.val.array.rawScalar == 1);
Assert(v.val.array.nElems == 1);
r = JsonbIteratorNext(&it, &v, true);
Assert(r == WJB_ELEM);
res = recursiveExecute(&elem, &v, jsqLeftArg, ra);
}
else
{
res = recursiveExecute(&elem, jb, jsqLeftArg, ra);
}
break;
case jqiAny:
if (jsqGetNext(jsq, &elem) == false)
{
res = true;
appendResult(ra, jb);
}
else if (recursiveExecute(&elem, jb, NULL, ra))
res = true;
else if (jb->type == jbvBinary)
res = recursiveAny(&elem, jb, ra);
break;
case jqiAll:
if (jsqGetNext(jsq, &elem) == false)
{
res = true;
appendResult(ra, jb);
}
if ((res = recursiveExecute(&elem, jb, NULL, ra)) == true)
{
if (jb->type == jbvBinary)
res = recursiveAll(&elem, jb, ra);
}
break;
case jqiAnyArray:
case jqiAllArray:
if (JsonbType(jb) == jbvArray)
{
JsonbIterator *it;
int32 r;
JsonbValue v;
bool anyres = false;
bool hasNext;
hasNext = jsqGetNext(jsq, &elem);
it = JsonbIteratorInit(jb->val.binary.data);
if (hasNext == false)
{
res = true;
while(ra && (r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
if (r == WJB_ELEM)
appendResult(ra, &v);
break;
}
if (jsq->type == jqiAllArray)
res = true;
while((r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
{
if (r == WJB_ELEM)
{
res = recursiveExecute(&elem, &v, NULL, ra);
if (jsq->type == jqiAnyArray)
{
anyres |= res;
if (res == true &&
(ra == NULL || ra->missAppend == true))
break;
}
else if (jsq->type == jqiAllArray)
{
if (res == false)
break;
}
}
}
if (jsq->type == jqiAnyArray)
res = anyres;
}
break;
case jqiIndexArray:
if (JsonbType(jb) == jbvArray)
{
JsonbValue *v;
v = getIthJsonbValueFromContainer(jb->val.binary.data,
jsq->arrayIndex);
if (v)
{
if (jsqGetNext(jsq, &elem) == false)
{
res = true;
appendResult(ra, v);
}
else
res = recursiveExecute(&elem, v, NULL, ra);
}
}
break;
case jqiAnyKey:
case jqiAllKey:
if (JsonbType(jb) == jbvObject)
{
JsonbIterator *it;
int32 r;
JsonbValue v;
bool anyres = false;
bool hasNext;
hasNext = jsqGetNext(jsq, &elem);
it = JsonbIteratorInit(jb->val.binary.data);
if (hasNext == false)
{
res = true;
while(ra && (r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
if (r == WJB_VALUE)
appendResult(ra, &v);
break;
}
if (jsq->type == jqiAllKey)
res = true;
while((r = JsonbIteratorNext(&it, &v, true)) != WJB_DONE)
{
if (r == WJB_VALUE)
{
res = recursiveExecute(&elem, &v, NULL, ra);
if (jsq->type == jqiAnyKey)
{
anyres |= res;
if (res == true &&
(ra == NULL || ra->missAppend == true))
break;
}
else if (jsq->type == jqiAllKey)
{
if (res == false)
break;
}
}
}
if (jsq->type == jqiAnyKey)
res = anyres;
}
break;
case jqiEqual:
case jqiIn:
case jqiLess:
case jqiGreater:
case jqiLessOrEqual:
case jqiGreaterOrEqual:
case jqiContains:
case jqiContained:
case jqiOverlap:
jsqGetArg(jsq, &elem);
res = executeExpr(&elem, jsq->type, jb, jsqLeftArg);
break;
case jqiLength:
jsqGetNext(jsq, &elem);
res = recursiveExecute(&elem, jb, jsq, ra);
break;
case jqiIs:
if (JsonbType(jb) == jbvScalar)
{
JsonbIterator *it;
int32 r PG_USED_FOR_ASSERTS_ONLY;
JsonbValue v;
it = JsonbIteratorInit(jb->val.binary.data);
r = JsonbIteratorNext(&it, &v, true);
Assert(r == WJB_BEGIN_ARRAY);
Assert(v.val.array.rawScalar == 1);
Assert(v.val.array.nElems == 1);
r = JsonbIteratorNext(&it, &v, true);
Assert(r == WJB_ELEM);
res = (jsqGetIsType(jsq) == JsonbType(&v));
}
else
{
res = (jsqGetIsType(jsq) == JsonbType(jb));
}
break;
case jqiFilter:
{
bool saveMissAppend = (ra) ? ra->missAppend : true;
jsqGetArg(jsq, &elem);
if (ra)
ra->missAppend = true;
res = recursiveExecute(&elem, jb, jsqLeftArg, ra);
if (ra)
ra->missAppend = saveMissAppend;
if (res) {
if (jsqGetNext(jsq, &elem) == false)
{
appendResult(ra, jb);
res = true;
}
else
res = recursiveExecute(&elem, jb, jsqLeftArg, ra);
}
}
break;
default:
elog(ERROR,"Wrong state: %d", jsq->type);
}
return res;
}
PG_FUNCTION_INFO_V1(jsquery_json_exec);
Datum
jsquery_json_exec(PG_FUNCTION_ARGS)
{
JsQuery *jq = PG_GETARG_JSQUERY(0);
Jsonb *jb = PG_GETARG_JSONB_P(1);
bool res;
JsonbValue jbv;
JsQueryItem jsq;
jbv.type = jbvBinary;
jbv.val.binary.data = &jb->root;
jbv.val.binary.len = VARSIZE_ANY_EXHDR(jb);
jsqInit(&jsq, jq);
res = recursiveExecute(&jsq, &jbv, NULL, NULL);
PG_FREE_IF_COPY(jq, 0);
PG_FREE_IF_COPY(jb, 1);
PG_RETURN_BOOL(res);
}
PG_FUNCTION_INFO_V1(json_jsquery_exec);
Datum
json_jsquery_exec(PG_FUNCTION_ARGS)
{
Jsonb *jb = PG_GETARG_JSONB_P(0);
JsQuery *jq = PG_GETARG_JSQUERY(1);
bool res;
JsonbValue jbv;
JsQueryItem jsq;
jbv.type = jbvBinary;
jbv.val.binary.data = &jb->root;
jbv.val.binary.len = VARSIZE_ANY_EXHDR(jb);
jsqInit(&jsq, jq);
res = recursiveExecute(&jsq, &jbv, NULL, NULL);
PG_FREE_IF_COPY(jb, 0);
PG_FREE_IF_COPY(jq, 1);
PG_RETURN_BOOL(res);
}
PG_FUNCTION_INFO_V1(json_jsquery_filter);
Datum
json_jsquery_filter(PG_FUNCTION_ARGS)
{
Jsonb *jb = PG_GETARG_JSONB_P(0);
JsQuery *jq = PG_GETARG_JSQUERY(1);
Jsonb *res = NULL;
JsonbValue jbv;
JsQueryItem jsq;
ResultAccum ra;
jbv.type = jbvBinary;
jbv.val.binary.data = &jb->root;
jbv.val.binary.len = VARSIZE_ANY_EXHDR(jb);
jsqInit(&jsq, jq);
memset(&ra, 0, sizeof(ra));
recursiveExecute(&jsq, &jbv, NULL, &ra);
if (ra.jbArrayState)
{
res = JsonbValueToJsonb(
pushJsonbValue(&ra.jbArrayState, WJB_END_ARRAY, NULL)
);
}
PG_FREE_IF_COPY(jb, 0);
PG_FREE_IF_COPY(jq, 1);
if (res)
PG_RETURN_JSONB_P(res);
PG_RETURN_NULL();
}
static int
compareJsQuery(JsQueryItem *v1, JsQueryItem *v2)
{
JsQueryItem elem1, elem2;
int32 res = 0;
check_stack_depth();
if (v1->type != v2->type)
return (v1->type > v2->type) ? 1 : -1;
switch(v1->type)
{
case jqiNull:
case jqiCurrent:
case jqiLength:
case jqiAny:
case jqiAnyArray:
case jqiAnyKey:
case jqiAll:
case jqiAllArray:
case jqiAllKey:
case jqiFilter:
break;
case jqiIndexArray:
if (v1->arrayIndex != v2->arrayIndex)
res = (v1->arrayIndex > v2->arrayIndex) ? 1 : -1;
break;
case jqiKey:
case jqiString:
{
int32 len1, len2;
char *s1, *s2;
s1 = jsqGetString(v1, &len1);
s2 = jsqGetString(v2, &len2);
if (len1 != len2)
res = (len1 > len2) ? 1 : -1;
else
res = memcmp(s1, s2, len1);
}
break;
case jqiNumeric:
res = compareNumeric(jsqGetNumeric(v1), jsqGetNumeric(v2));
break;
case jqiBool:
if (jsqGetBool(v1) != jsqGetBool(v2))
res = (jsqGetBool(v1) > jsqGetBool(v2)) ? 1 : -1;
break;
case jqiArray:
if (v1->array.nelems != v2->array.nelems)
res = (v1->array.nelems > v2->array.nelems) ? 1 : -1;
while(res == 0 && jsqIterateArray(v1, &elem1) && jsqIterateArray(v2, &elem2))
res = compareJsQuery(&elem1, &elem2);
break;
case jqiAnd:
case jqiOr:
jsqGetLeftArg(v1, &elem1);
jsqGetLeftArg(v2, &elem2);
res = compareJsQuery(&elem1, &elem2);
if (res == 0)
{
jsqGetRightArg(v1, &elem1);
jsqGetRightArg(v2, &elem2);
res = compareJsQuery(&elem1, &elem2);
}
break;
case jqiEqual:
case jqiIn:
case jqiLess:
case jqiGreater:
case jqiLessOrEqual:
case jqiGreaterOrEqual:
case jqiContains:
case jqiContained:
case jqiOverlap:
case jqiNot:
jsqGetArg(v1, &elem1);
jsqGetArg(v2, &elem2);
res = compareJsQuery(&elem1, &elem2);
break;
default:
elog(ERROR, "Unknown JsQueryItem type: %d", v1->type);
}
if (res == 0)
{
if (jsqGetNext(v1, &elem1))
{
if (jsqGetNext(v2, &elem2))
res = compareJsQuery(&elem1, &elem2);
else
res = 1;
}
else if (jsqGetNext(v2, &elem2))
{
res = -1;
}
}
return res;
}
PG_FUNCTION_INFO_V1(jsquery_cmp);
Datum
jsquery_cmp(PG_FUNCTION_ARGS)
{
JsQuery *jq1 = PG_GETARG_JSQUERY(0);
JsQuery *jq2 = PG_GETARG_JSQUERY(1);
int32 res;
JsQueryItem v1, v2;
jsqInit(&v1, jq1);
jsqInit(&v2, jq2);
res = compareJsQuery(&v1, &v2);
PG_FREE_IF_COPY(jq1, 0);
PG_FREE_IF_COPY(jq2, 1);
PG_RETURN_INT32(res);
}
PG_FUNCTION_INFO_V1(jsquery_lt);
Datum
jsquery_lt(PG_FUNCTION_ARGS)
{
JsQuery *jq1 = PG_GETARG_JSQUERY(0);
JsQuery *jq2 = PG_GETARG_JSQUERY(1);
int32 res;