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jsonb.c
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jsonb.c
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/*-------------------------------------------------------------------------
*
* jsonb.c
* I/O routines for jsonb type
*
* Copyright (c) 2014-2023, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/utils/adt/jsonb.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/htup_details.h"
#include "access/transam.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "funcapi.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/datetime.h"
#include "utils/json.h"
#include "utils/jsonb.h"
#include "utils/jsonfuncs.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
typedef struct JsonbInState
{
JsonbParseState *parseState;
JsonbValue *res;
bool unique_keys;
Node *escontext;
} JsonbInState;
typedef struct JsonbAggState
{
JsonbInState *res;
JsonTypeCategory key_category;
Oid key_output_func;
JsonTypeCategory val_category;
Oid val_output_func;
} JsonbAggState;
static inline Datum jsonb_from_cstring(char *json, int len, bool unique_keys,
Node *escontext);
static bool checkStringLen(size_t len, Node *escontext);
static JsonParseErrorType jsonb_in_object_start(void *pstate);
static JsonParseErrorType jsonb_in_object_end(void *pstate);
static JsonParseErrorType jsonb_in_array_start(void *pstate);
static JsonParseErrorType jsonb_in_array_end(void *pstate);
static JsonParseErrorType jsonb_in_object_field_start(void *pstate, char *fname, bool isnull);
static void jsonb_put_escaped_value(StringInfo out, JsonbValue *scalarVal);
static JsonParseErrorType jsonb_in_scalar(void *pstate, char *token, JsonTokenType tokentype);
static void composite_to_jsonb(Datum composite, JsonbInState *result);
static void array_dim_to_jsonb(JsonbInState *result, int dim, int ndims, int *dims,
Datum *vals, bool *nulls, int *valcount,
JsonTypeCategory tcategory, Oid outfuncoid);
static void array_to_jsonb_internal(Datum array, JsonbInState *result);
static void datum_to_jsonb_internal(Datum val, bool is_null, JsonbInState *result,
JsonTypeCategory tcategory, Oid outfuncoid,
bool key_scalar);
static void add_jsonb(Datum val, bool is_null, JsonbInState *result,
Oid val_type, bool key_scalar);
static JsonbParseState *clone_parse_state(JsonbParseState *state);
static char *JsonbToCStringWorker(StringInfo out, JsonbContainer *in, int estimated_len, bool indent);
static void add_indent(StringInfo out, bool indent, int level);
/*
* jsonb type input function
*/
Datum
jsonb_in(PG_FUNCTION_ARGS)
{
char *json = PG_GETARG_CSTRING(0);
return jsonb_from_cstring(json, strlen(json), false, fcinfo->context);
}
/*
* jsonb type recv function
*
* The type is sent as text in binary mode, so this is almost the same
* as the input function, but it's prefixed with a version number so we
* can change the binary format sent in future if necessary. For now,
* only version 1 is supported.
*/
Datum
jsonb_recv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
int version = pq_getmsgint(buf, 1);
char *str;
int nbytes;
if (version == 1)
str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
else
elog(ERROR, "unsupported jsonb version number %d", version);
return jsonb_from_cstring(str, nbytes, false, NULL);
}
/*
* jsonb type output function
*/
Datum
jsonb_out(PG_FUNCTION_ARGS)
{
Jsonb *jb = PG_GETARG_JSONB_P(0);
char *out;
out = JsonbToCString(NULL, &jb->root, VARSIZE(jb));
PG_RETURN_CSTRING(out);
}
/*
* jsonb type send function
*
* Just send jsonb as a version number, then a string of text
*/
Datum
jsonb_send(PG_FUNCTION_ARGS)
{
Jsonb *jb = PG_GETARG_JSONB_P(0);
StringInfoData buf;
StringInfo jtext = makeStringInfo();
int version = 1;
(void) JsonbToCString(jtext, &jb->root, VARSIZE(jb));
pq_begintypsend(&buf);
pq_sendint8(&buf, version);
pq_sendtext(&buf, jtext->data, jtext->len);
pfree(jtext->data);
pfree(jtext);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* jsonb_from_text
*
* Turns json text string into a jsonb Datum.
*/
Datum
jsonb_from_text(text *js, bool unique_keys)
{
return jsonb_from_cstring(VARDATA_ANY(js),
VARSIZE_ANY_EXHDR(js),
unique_keys,
NULL);
}
/*
* Get the type name of a jsonb container.
*/
static const char *
JsonbContainerTypeName(JsonbContainer *jbc)
{
JsonbValue scalar;
if (JsonbExtractScalar(jbc, &scalar))
return JsonbTypeName(&scalar);
else if (JsonContainerIsArray(jbc))
return "array";
else if (JsonContainerIsObject(jbc))
return "object";
else
{
elog(ERROR, "invalid jsonb container type: 0x%08x", jbc->header);
return "unknown";
}
}
/*
* Get the type name of a jsonb value.
*/
const char *
JsonbTypeName(JsonbValue *val)
{
switch (val->type)
{
case jbvBinary:
return JsonbContainerTypeName(val->val.binary.data);
case jbvObject:
return "object";
case jbvArray:
return "array";
case jbvNumeric:
return "number";
case jbvString:
return "string";
case jbvBool:
return "boolean";
case jbvNull:
return "null";
case jbvDatetime:
switch (val->val.datetime.typid)
{
case DATEOID:
return "date";
case TIMEOID:
return "time without time zone";
case TIMETZOID:
return "time with time zone";
case TIMESTAMPOID:
return "timestamp without time zone";
case TIMESTAMPTZOID:
return "timestamp with time zone";
default:
elog(ERROR, "unrecognized jsonb value datetime type: %d",
val->val.datetime.typid);
}
return "unknown";
default:
elog(ERROR, "unrecognized jsonb value type: %d", val->type);
return "unknown";
}
}
/*
* SQL function jsonb_typeof(jsonb) -> text
*
* This function is here because the analog json function is in json.c, since
* it uses the json parser internals not exposed elsewhere.
*/
Datum
jsonb_typeof(PG_FUNCTION_ARGS)
{
Jsonb *in = PG_GETARG_JSONB_P(0);
const char *result = JsonbContainerTypeName(&in->root);
PG_RETURN_TEXT_P(cstring_to_text(result));
}
/*
* jsonb_from_cstring
*
* Turns json string into a jsonb Datum.
*
* Uses the json parser (with hooks) to construct a jsonb.
*
* If escontext points to an ErrorSaveContext, errors are reported there
* instead of being thrown.
*/
static inline Datum
jsonb_from_cstring(char *json, int len, bool unique_keys, Node *escontext)
{
JsonLexContext lex;
JsonbInState state;
JsonSemAction sem;
memset(&state, 0, sizeof(state));
memset(&sem, 0, sizeof(sem));
makeJsonLexContextCstringLen(&lex, json, len, GetDatabaseEncoding(), true);
state.unique_keys = unique_keys;
state.escontext = escontext;
sem.semstate = (void *) &state;
sem.object_start = jsonb_in_object_start;
sem.array_start = jsonb_in_array_start;
sem.object_end = jsonb_in_object_end;
sem.array_end = jsonb_in_array_end;
sem.scalar = jsonb_in_scalar;
sem.object_field_start = jsonb_in_object_field_start;
if (!pg_parse_json_or_errsave(&lex, &sem, escontext))
return (Datum) 0;
/* after parsing, the item member has the composed jsonb structure */
PG_RETURN_POINTER(JsonbValueToJsonb(state.res));
}
static bool
checkStringLen(size_t len, Node *escontext)
{
if (len > JENTRY_OFFLENMASK)
ereturn(escontext, false,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("string too long to represent as jsonb string"),
errdetail("Due to an implementation restriction, jsonb strings cannot exceed %d bytes.",
JENTRY_OFFLENMASK)));
return true;
}
static JsonParseErrorType
jsonb_in_object_start(void *pstate)
{
JsonbInState *_state = (JsonbInState *) pstate;
_state->res = pushJsonbValue(&_state->parseState, WJB_BEGIN_OBJECT, NULL);
_state->parseState->unique_keys = _state->unique_keys;
return JSON_SUCCESS;
}
static JsonParseErrorType
jsonb_in_object_end(void *pstate)
{
JsonbInState *_state = (JsonbInState *) pstate;
_state->res = pushJsonbValue(&_state->parseState, WJB_END_OBJECT, NULL);
return JSON_SUCCESS;
}
static JsonParseErrorType
jsonb_in_array_start(void *pstate)
{
JsonbInState *_state = (JsonbInState *) pstate;
_state->res = pushJsonbValue(&_state->parseState, WJB_BEGIN_ARRAY, NULL);
return JSON_SUCCESS;
}
static JsonParseErrorType
jsonb_in_array_end(void *pstate)
{
JsonbInState *_state = (JsonbInState *) pstate;
_state->res = pushJsonbValue(&_state->parseState, WJB_END_ARRAY, NULL);
return JSON_SUCCESS;
}
static JsonParseErrorType
jsonb_in_object_field_start(void *pstate, char *fname, bool isnull)
{
JsonbInState *_state = (JsonbInState *) pstate;
JsonbValue v;
Assert(fname != NULL);
v.type = jbvString;
v.val.string.len = strlen(fname);
if (!checkStringLen(v.val.string.len, _state->escontext))
return JSON_SEM_ACTION_FAILED;
v.val.string.val = fname;
_state->res = pushJsonbValue(&_state->parseState, WJB_KEY, &v);
return JSON_SUCCESS;
}
static void
jsonb_put_escaped_value(StringInfo out, JsonbValue *scalarVal)
{
switch (scalarVal->type)
{
case jbvNull:
appendBinaryStringInfo(out, "null", 4);
break;
case jbvString:
escape_json(out, pnstrdup(scalarVal->val.string.val, scalarVal->val.string.len));
break;
case jbvNumeric:
appendStringInfoString(out,
DatumGetCString(DirectFunctionCall1(numeric_out,
PointerGetDatum(scalarVal->val.numeric))));
break;
case jbvBool:
if (scalarVal->val.boolean)
appendBinaryStringInfo(out, "true", 4);
else
appendBinaryStringInfo(out, "false", 5);
break;
default:
elog(ERROR, "unknown jsonb scalar type");
}
}
/*
* For jsonb we always want the de-escaped value - that's what's in token
*/
static JsonParseErrorType
jsonb_in_scalar(void *pstate, char *token, JsonTokenType tokentype)
{
JsonbInState *_state = (JsonbInState *) pstate;
JsonbValue v;
Datum numd;
switch (tokentype)
{
case JSON_TOKEN_STRING:
Assert(token != NULL);
v.type = jbvString;
v.val.string.len = strlen(token);
if (!checkStringLen(v.val.string.len, _state->escontext))
return JSON_SEM_ACTION_FAILED;
v.val.string.val = token;
break;
case JSON_TOKEN_NUMBER:
/*
* No need to check size of numeric values, because maximum
* numeric size is well below the JsonbValue restriction
*/
Assert(token != NULL);
v.type = jbvNumeric;
if (!DirectInputFunctionCallSafe(numeric_in, token,
InvalidOid, -1,
_state->escontext,
&numd))
return JSON_SEM_ACTION_FAILED;
v.val.numeric = DatumGetNumeric(numd);
break;
case JSON_TOKEN_TRUE:
v.type = jbvBool;
v.val.boolean = true;
break;
case JSON_TOKEN_FALSE:
v.type = jbvBool;
v.val.boolean = false;
break;
case JSON_TOKEN_NULL:
v.type = jbvNull;
break;
default:
/* should not be possible */
elog(ERROR, "invalid json token type");
break;
}
if (_state->parseState == NULL)
{
/* single scalar */
JsonbValue va;
va.type = jbvArray;
va.val.array.rawScalar = true;
va.val.array.nElems = 1;
_state->res = pushJsonbValue(&_state->parseState, WJB_BEGIN_ARRAY, &va);
_state->res = pushJsonbValue(&_state->parseState, WJB_ELEM, &v);
_state->res = pushJsonbValue(&_state->parseState, WJB_END_ARRAY, NULL);
}
else
{
JsonbValue *o = &_state->parseState->contVal;
switch (o->type)
{
case jbvArray:
_state->res = pushJsonbValue(&_state->parseState, WJB_ELEM, &v);
break;
case jbvObject:
_state->res = pushJsonbValue(&_state->parseState, WJB_VALUE, &v);
break;
default:
elog(ERROR, "unexpected parent of nested structure");
}
}
return JSON_SUCCESS;
}
/*
* JsonbToCString
* Converts jsonb value to a C-string.
*
* If 'out' argument is non-null, the resulting C-string is stored inside the
* StringBuffer. The resulting string is always returned.
*
* A typical case for passing the StringInfo in rather than NULL is where the
* caller wants access to the len attribute without having to call strlen, e.g.
* if they are converting it to a text* object.
*/
char *
JsonbToCString(StringInfo out, JsonbContainer *in, int estimated_len)
{
return JsonbToCStringWorker(out, in, estimated_len, false);
}
/*
* same thing but with indentation turned on
*/
char *
JsonbToCStringIndent(StringInfo out, JsonbContainer *in, int estimated_len)
{
return JsonbToCStringWorker(out, in, estimated_len, true);
}
/*
* common worker for above two functions
*/
static char *
JsonbToCStringWorker(StringInfo out, JsonbContainer *in, int estimated_len, bool indent)
{
bool first = true;
JsonbIterator *it;
JsonbValue v;
JsonbIteratorToken type = WJB_DONE;
int level = 0;
bool redo_switch = false;
/* If we are indenting, don't add a space after a comma */
int ispaces = indent ? 1 : 2;
/*
* Don't indent the very first item. This gets set to the indent flag at
* the bottom of the loop.
*/
bool use_indent = false;
bool raw_scalar = false;
bool last_was_key = false;
if (out == NULL)
out = makeStringInfo();
enlargeStringInfo(out, (estimated_len >= 0) ? estimated_len : 64);
it = JsonbIteratorInit(in);
while (redo_switch ||
((type = JsonbIteratorNext(&it, &v, false)) != WJB_DONE))
{
redo_switch = false;
switch (type)
{
case WJB_BEGIN_ARRAY:
if (!first)
appendBinaryStringInfo(out, ", ", ispaces);
if (!v.val.array.rawScalar)
{
add_indent(out, use_indent && !last_was_key, level);
appendStringInfoCharMacro(out, '[');
}
else
raw_scalar = true;
first = true;
level++;
break;
case WJB_BEGIN_OBJECT:
if (!first)
appendBinaryStringInfo(out, ", ", ispaces);
add_indent(out, use_indent && !last_was_key, level);
appendStringInfoCharMacro(out, '{');
first = true;
level++;
break;
case WJB_KEY:
if (!first)
appendBinaryStringInfo(out, ", ", ispaces);
first = true;
add_indent(out, use_indent, level);
/* json rules guarantee this is a string */
jsonb_put_escaped_value(out, &v);
appendBinaryStringInfo(out, ": ", 2);
type = JsonbIteratorNext(&it, &v, false);
if (type == WJB_VALUE)
{
first = false;
jsonb_put_escaped_value(out, &v);
}
else
{
Assert(type == WJB_BEGIN_OBJECT || type == WJB_BEGIN_ARRAY);
/*
* We need to rerun the current switch() since we need to
* output the object which we just got from the iterator
* before calling the iterator again.
*/
redo_switch = true;
}
break;
case WJB_ELEM:
if (!first)
appendBinaryStringInfo(out, ", ", ispaces);
first = false;
if (!raw_scalar)
add_indent(out, use_indent, level);
jsonb_put_escaped_value(out, &v);
break;
case WJB_END_ARRAY:
level--;
if (!raw_scalar)
{
add_indent(out, use_indent, level);
appendStringInfoCharMacro(out, ']');
}
first = false;
break;
case WJB_END_OBJECT:
level--;
add_indent(out, use_indent, level);
appendStringInfoCharMacro(out, '}');
first = false;
break;
default:
elog(ERROR, "unknown jsonb iterator token type");
}
use_indent = indent;
last_was_key = redo_switch;
}
Assert(level == 0);
return out->data;
}
static void
add_indent(StringInfo out, bool indent, int level)
{
if (indent)
{
appendStringInfoCharMacro(out, '\n');
appendStringInfoSpaces(out, level * 4);
}
}
/*
* Turn a Datum into jsonb, adding it to the result JsonbInState.
*
* tcategory and outfuncoid are from a previous call to json_categorize_type,
* except that if is_null is true then they can be invalid.
*
* If key_scalar is true, the value is stored as a key, so insist
* it's of an acceptable type, and force it to be a jbvString.
*
* Note: currently, we assume that result->escontext is NULL and errors
* will be thrown.
*/
static void
datum_to_jsonb_internal(Datum val, bool is_null, JsonbInState *result,
JsonTypeCategory tcategory, Oid outfuncoid,
bool key_scalar)
{
char *outputstr;
bool numeric_error;
JsonbValue jb;
bool scalar_jsonb = false;
check_stack_depth();
/* Convert val to a JsonbValue in jb (in most cases) */
if (is_null)
{
Assert(!key_scalar);
jb.type = jbvNull;
}
else if (key_scalar &&
(tcategory == JSONTYPE_ARRAY ||
tcategory == JSONTYPE_COMPOSITE ||
tcategory == JSONTYPE_JSON ||
tcategory == JSONTYPE_JSONB ||
tcategory == JSONTYPE_JSON))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("key value must be scalar, not array, composite, or json")));
}
else
{
if (tcategory == JSONTYPE_CAST)
val = OidFunctionCall1(outfuncoid, val);
switch (tcategory)
{
case JSONTYPE_ARRAY:
array_to_jsonb_internal(val, result);
break;
case JSONTYPE_COMPOSITE:
composite_to_jsonb(val, result);
break;
case JSONTYPE_BOOL:
if (key_scalar)
{
outputstr = DatumGetBool(val) ? "true" : "false";
jb.type = jbvString;
jb.val.string.len = strlen(outputstr);
jb.val.string.val = outputstr;
}
else
{
jb.type = jbvBool;
jb.val.boolean = DatumGetBool(val);
}
break;
case JSONTYPE_NUMERIC:
outputstr = OidOutputFunctionCall(outfuncoid, val);
if (key_scalar)
{
/* always quote keys */
jb.type = jbvString;
jb.val.string.len = strlen(outputstr);
jb.val.string.val = outputstr;
}
else
{
/*
* Make it numeric if it's a valid JSON number, otherwise
* a string. Invalid numeric output will always have an
* 'N' or 'n' in it (I think).
*/
numeric_error = (strchr(outputstr, 'N') != NULL ||
strchr(outputstr, 'n') != NULL);
if (!numeric_error)
{
Datum numd;
jb.type = jbvNumeric;
numd = DirectFunctionCall3(numeric_in,
CStringGetDatum(outputstr),
ObjectIdGetDatum(InvalidOid),
Int32GetDatum(-1));
jb.val.numeric = DatumGetNumeric(numd);
pfree(outputstr);
}
else
{
jb.type = jbvString;
jb.val.string.len = strlen(outputstr);
jb.val.string.val = outputstr;
}
}
break;
case JSONTYPE_DATE:
jb.type = jbvString;
jb.val.string.val = JsonEncodeDateTime(NULL, val,
DATEOID, NULL);
jb.val.string.len = strlen(jb.val.string.val);
break;
case JSONTYPE_TIMESTAMP:
jb.type = jbvString;
jb.val.string.val = JsonEncodeDateTime(NULL, val,
TIMESTAMPOID, NULL);
jb.val.string.len = strlen(jb.val.string.val);
break;
case JSONTYPE_TIMESTAMPTZ:
jb.type = jbvString;
jb.val.string.val = JsonEncodeDateTime(NULL, val,
TIMESTAMPTZOID, NULL);
jb.val.string.len = strlen(jb.val.string.val);
break;
case JSONTYPE_CAST:
case JSONTYPE_JSON:
{
/* parse the json right into the existing result object */
JsonLexContext lex;
JsonSemAction sem;
text *json = DatumGetTextPP(val);
makeJsonLexContext(&lex, json, true);
memset(&sem, 0, sizeof(sem));
sem.semstate = (void *) result;
sem.object_start = jsonb_in_object_start;
sem.array_start = jsonb_in_array_start;
sem.object_end = jsonb_in_object_end;
sem.array_end = jsonb_in_array_end;
sem.scalar = jsonb_in_scalar;
sem.object_field_start = jsonb_in_object_field_start;
pg_parse_json_or_ereport(&lex, &sem);
freeJsonLexContext(&lex);
}
break;
case JSONTYPE_JSONB:
{
Jsonb *jsonb = DatumGetJsonbP(val);
JsonbIterator *it;
it = JsonbIteratorInit(&jsonb->root);
if (JB_ROOT_IS_SCALAR(jsonb))
{
(void) JsonbIteratorNext(&it, &jb, true);
Assert(jb.type == jbvArray);
(void) JsonbIteratorNext(&it, &jb, true);
scalar_jsonb = true;
}
else
{
JsonbIteratorToken type;
while ((type = JsonbIteratorNext(&it, &jb, false))
!= WJB_DONE)
{
if (type == WJB_END_ARRAY || type == WJB_END_OBJECT ||
type == WJB_BEGIN_ARRAY || type == WJB_BEGIN_OBJECT)
result->res = pushJsonbValue(&result->parseState,
type, NULL);
else
result->res = pushJsonbValue(&result->parseState,
type, &jb);
}
}
}
break;
default:
outputstr = OidOutputFunctionCall(outfuncoid, val);
jb.type = jbvString;
jb.val.string.len = strlen(outputstr);
(void) checkStringLen(jb.val.string.len, NULL);
jb.val.string.val = outputstr;
break;
}
}
/* Now insert jb into result, unless we did it recursively */
if (!is_null && !scalar_jsonb &&
tcategory >= JSONTYPE_JSON && tcategory <= JSONTYPE_CAST)
{
/* work has been done recursively */
return;
}
else if (result->parseState == NULL)
{
/* single root scalar */
JsonbValue va;
va.type = jbvArray;
va.val.array.rawScalar = true;
va.val.array.nElems = 1;
result->res = pushJsonbValue(&result->parseState, WJB_BEGIN_ARRAY, &va);
result->res = pushJsonbValue(&result->parseState, WJB_ELEM, &jb);
result->res = pushJsonbValue(&result->parseState, WJB_END_ARRAY, NULL);
}
else
{
JsonbValue *o = &result->parseState->contVal;
switch (o->type)
{
case jbvArray:
result->res = pushJsonbValue(&result->parseState, WJB_ELEM, &jb);
break;
case jbvObject:
result->res = pushJsonbValue(&result->parseState,
key_scalar ? WJB_KEY : WJB_VALUE,
&jb);
break;
default:
elog(ERROR, "unexpected parent of nested structure");
}
}
}
/*
* Process a single dimension of an array.
* If it's the innermost dimension, output the values, otherwise call
* ourselves recursively to process the next dimension.
*/
static void
array_dim_to_jsonb(JsonbInState *result, int dim, int ndims, int *dims, Datum *vals,
bool *nulls, int *valcount, JsonTypeCategory tcategory,
Oid outfuncoid)
{
int i;
Assert(dim < ndims);
result->res = pushJsonbValue(&result->parseState, WJB_BEGIN_ARRAY, NULL);
for (i = 1; i <= dims[dim]; i++)
{
if (dim + 1 == ndims)
{
datum_to_jsonb_internal(vals[*valcount], nulls[*valcount], result, tcategory,
outfuncoid, false);
(*valcount)++;
}
else
{
array_dim_to_jsonb(result, dim + 1, ndims, dims, vals, nulls,
valcount, tcategory, outfuncoid);
}
}
result->res = pushJsonbValue(&result->parseState, WJB_END_ARRAY, NULL);
}
/*
* Turn an array into JSON.
*/
static void
array_to_jsonb_internal(Datum array, JsonbInState *result)
{
ArrayType *v = DatumGetArrayTypeP(array);
Oid element_type = ARR_ELEMTYPE(v);
int *dim;
int ndim;
int nitems;
int count = 0;
Datum *elements;
bool *nulls;
int16 typlen;
bool typbyval;
char typalign;
JsonTypeCategory tcategory;
Oid outfuncoid;
ndim = ARR_NDIM(v);
dim = ARR_DIMS(v);
nitems = ArrayGetNItems(ndim, dim);
if (nitems <= 0)
{
result->res = pushJsonbValue(&result->parseState, WJB_BEGIN_ARRAY, NULL);
result->res = pushJsonbValue(&result->parseState, WJB_END_ARRAY, NULL);
return;
}
get_typlenbyvalalign(element_type,
&typlen, &typbyval, &typalign);
json_categorize_type(element_type, true,
&tcategory, &outfuncoid);
deconstruct_array(v, element_type, typlen, typbyval,
typalign, &elements, &nulls,
&nitems);
array_dim_to_jsonb(result, 0, ndim, dim, elements, nulls, &count, tcategory,
outfuncoid);
pfree(elements);
pfree(nulls);
}
/*
* Turn a composite / record into JSON.
*/
static void
composite_to_jsonb(Datum composite, JsonbInState *result)
{
HeapTupleHeader td;
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
HeapTupleData tmptup,
*tuple;
int i;
td = DatumGetHeapTupleHeader(composite);
/* Extract rowtype info and find a tupdesc */
tupType = HeapTupleHeaderGetTypeId(td);
tupTypmod = HeapTupleHeaderGetTypMod(td);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
/* Build a temporary HeapTuple control structure */
tmptup.t_len = HeapTupleHeaderGetDatumLength(td);
tmptup.t_data = td;
tuple = &tmptup;
result->res = pushJsonbValue(&result->parseState, WJB_BEGIN_OBJECT, NULL);
for (i = 0; i < tupdesc->natts; i++)
{
Datum val;
bool isnull;
char *attname;
JsonTypeCategory tcategory;
Oid outfuncoid;
JsonbValue v;
Form_pg_attribute att = TupleDescAttr(tupdesc, i);
if (att->attisdropped)
continue;
attname = NameStr(att->attname);
v.type = jbvString;
/* don't need checkStringLen here - can't exceed maximum name length */
v.val.string.len = strlen(attname);
v.val.string.val = attname;
result->res = pushJsonbValue(&result->parseState, WJB_KEY, &v);
val = heap_getattr(tuple, i + 1, tupdesc, &isnull);
if (isnull)
{
tcategory = JSONTYPE_NULL;
outfuncoid = InvalidOid;
}
else