greenplumn jsonb 源码
greenplumn jsonb 代码
文件路径：/src/backend/utils/adt/jsonb.c
/*-------------------------------------------------------------------------
*
* jsonb.c
* I/O routines for jsonb type
*
* Copyright (c) 2014-2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/utils/adt/jsonb.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "miscadmin.h"
#include "access/htup_details.h"
#include "access/transam.h"
#include "catalog/pg_type.h"
#include "funcapi.h"
#include "libpq/pqformat.h"
#include "parser/parse_coerce.h"
#include "utils/builtins.h"
#include "utils/date.h"
#include "utils/datetime.h"
#include "utils/lsyscache.h"
#include "utils/json.h"
#include "utils/jsonapi.h"
#include "utils/jsonb.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
typedef struct JsonbInState
{
JsonbParseState *parseState;
JsonbValue *res;
} JsonbInState;
/* unlike with json categories, we need to treat json and jsonb differently */
typedef enum /* type categories for datum_to_jsonb */
{
JSONBTYPE_NULL, /* null, so we didn't bother to identify */
JSONBTYPE_BOOL, /* boolean (built-in types only) */
JSONBTYPE_NUMERIC, /* numeric (ditto) */
JSONBTYPE_DATE, /* we use special formatting for datetimes */
JSONBTYPE_TIMESTAMP, /* we use special formatting for timestamp */
JSONBTYPE_TIMESTAMPTZ, /* ... and timestamptz */
JSONBTYPE_JSON, /* JSON */
JSONBTYPE_JSONB, /* JSONB */
JSONBTYPE_ARRAY, /* array */
JSONBTYPE_COMPOSITE, /* composite */
JSONBTYPE_JSONCAST, /* something with an explicit cast to JSON */
JSONBTYPE_OTHER /* all else */
} JsonbTypeCategory;
typedef struct JsonbAggState
{
JsonbInState *res;
JsonbTypeCategory key_category;
Oid key_output_func;
JsonbTypeCategory val_category;
Oid val_output_func;
} JsonbAggState;
static inline Datum jsonb_from_cstring(char *json, int len);
static size_t checkStringLen(size_t len);
static void jsonb_in_object_start(void *pstate);
static void jsonb_in_object_end(void *pstate);
static void jsonb_in_array_start(void *pstate);
static void jsonb_in_array_end(void *pstate);
static void jsonb_in_object_field_start(void *pstate, char *fname, bool isnull);
static void jsonb_put_escaped_value(StringInfo out, JsonbValue *scalarVal);
static void jsonb_in_scalar(void *pstate, char *token, JsonTokenType tokentype);
static void jsonb_categorize_type(Oid typoid,
JsonbTypeCategory *tcategory,
Oid *outfuncoid);
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,
JsonbTypeCategory tcategory, Oid outfuncoid);
static void array_to_jsonb_internal(Datum array, JsonbInState *result);
static void jsonb_categorize_type(Oid typoid,
JsonbTypeCategory *tcategory,
Oid *outfuncoid);
static void datum_to_jsonb(Datum val, bool is_null, JsonbInState *result,
JsonbTypeCategory 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));
}
/*
* 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);
}
/*
* 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));
}
/*
* 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 *jbv)
{
switch (jbv->type)
{
case jbvBinary:
return JsonbContainerTypeName(jbv->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";
default:
elog(ERROR, "unrecognized jsonb value type: %d", jbv->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.
*/
static inline Datum
jsonb_from_cstring(char *json, int len)
{
JsonLexContext *lex;
JsonbInState state;
JsonSemAction sem;
memset(&state, 0, sizeof(state));
memset(&sem, 0, sizeof(sem));
lex = makeJsonLexContextCstringLen(json, len, true);
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;
pg_parse_json(lex, &sem);
/* after parsing, the item member has the composed jsonb structure */
PG_RETURN_POINTER(JsonbValueToJsonb(state.res));
}
static size_t
checkStringLen(size_t len)
{
if (len > JENTRY_OFFLENMASK)
ereport(ERROR,
(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 len;
}
static void
jsonb_in_object_start(void *pstate)
{
JsonbInState *_state = (JsonbInState *) pstate;
_state->res = pushJsonbValue(&_state->parseState, WJB_BEGIN_OBJECT, NULL);
}
static void
jsonb_in_object_end(void *pstate)
{
JsonbInState *_state = (JsonbInState *) pstate;
_state->res = pushJsonbValue(&_state->parseState, WJB_END_OBJECT, NULL);
}
static void
jsonb_in_array_start(void *pstate)
{
JsonbInState *_state = (JsonbInState *) pstate;
_state->res = pushJsonbValue(&_state->parseState, WJB_BEGIN_ARRAY, NULL);
}
static void
jsonb_in_array_end(void *pstate)
{
JsonbInState *_state = (JsonbInState *) pstate;
_state->res = pushJsonbValue(&_state->parseState, WJB_END_ARRAY, NULL);
}
static void
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 = checkStringLen(strlen(fname));
v.val.string.val = fname;
_state->res = pushJsonbValue(&_state->parseState, WJB_KEY, &v);
}
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 void
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 = checkStringLen(strlen(token));
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;
numd = DirectFunctionCall3(numeric_in,
CStringGetDatum(token),
ObjectIdGetDatum(InvalidOid),
Int32GetDatum(-1));
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");
}
}
}
/*
* 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)
{
int i;
appendStringInfoCharMacro(out, '\n');
for (i = 0; i < level; i++)
appendBinaryStringInfo(out, " ", 4);
}
}
/*
* Determine how we want to render values of a given type in datum_to_jsonb.
*
* Given the datatype OID, return its JsonbTypeCategory, as well as the type's
* output function OID. If the returned category is JSONBTYPE_JSONCAST,
* we return the OID of the relevant cast function instead.
*/
static void
jsonb_categorize_type(Oid typoid,
JsonbTypeCategory *tcategory,
Oid *outfuncoid)
{
bool typisvarlena;
/* Look through any domain */
typoid = getBaseType(typoid);
*outfuncoid = InvalidOid;
/*
* We need to get the output function for everything except date and
* timestamp types, booleans, array and composite types, json and jsonb,
* and non-builtin types where there's a cast to json. In this last case
* we return the oid of the cast function instead.
*/
switch (typoid)
{
case BOOLOID:
*tcategory = JSONBTYPE_BOOL;
break;
case INT2OID:
case INT4OID:
case INT8OID:
case FLOAT4OID:
case FLOAT8OID:
case NUMERICOID:
getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
*tcategory = JSONBTYPE_NUMERIC;
break;
case DATEOID:
*tcategory = JSONBTYPE_DATE;
break;
case TIMESTAMPOID:
*tcategory = JSONBTYPE_TIMESTAMP;
break;
case TIMESTAMPTZOID:
*tcategory = JSONBTYPE_TIMESTAMPTZ;
break;
case JSONBOID:
*tcategory = JSONBTYPE_JSONB;
break;
case JSONOID:
*tcategory = JSONBTYPE_JSON;
break;
default:
/* Check for arrays and composites */
if (OidIsValid(get_element_type(typoid)) || typoid == ANYARRAYOID
|| typoid == RECORDARRAYOID)
*tcategory = JSONBTYPE_ARRAY;
else if (type_is_rowtype(typoid)) /* includes RECORDOID */
*tcategory = JSONBTYPE_COMPOSITE;
else
{
/* It's probably the general case ... */
*tcategory = JSONBTYPE_OTHER;
/*
* but first let's look for a cast to json (note: not to
* jsonb) if it's not built-in.
*/
if (typoid >= FirstNormalObjectId)
{
Oid castfunc;
CoercionPathType ctype;
ctype = find_coercion_pathway(JSONOID, typoid,
COERCION_EXPLICIT, &castfunc);
if (ctype == COERCION_PATH_FUNC && OidIsValid(castfunc))
{
*tcategory = JSONBTYPE_JSONCAST;
*outfuncoid = castfunc;
}
else
{
/* not a cast type, so just get the usual output func */
getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
}
}
else
{
/* any other builtin type */
getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
}
break;
}
}
}
/*
* 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.
*/
static void
datum_to_jsonb(Datum val, bool is_null, JsonbInState *result,
JsonbTypeCategory 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 == JSONBTYPE_ARRAY ||
tcategory == JSONBTYPE_COMPOSITE ||
tcategory == JSONBTYPE_JSON ||
tcategory == JSONBTYPE_JSONB ||
tcategory == JSONBTYPE_JSONCAST))
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("key value must be scalar, not array, composite, or json")));
}
else
{
if (tcategory == JSONBTYPE_JSONCAST)
val = OidFunctionCall1(outfuncoid, val);
switch (tcategory)
{
case JSONBTYPE_ARRAY:
array_to_jsonb_internal(val, result);
break;
case JSONBTYPE_COMPOSITE:
composite_to_jsonb(val, result);
break;
case JSONBTYPE_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 JSONBTYPE_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 JSONBTYPE_DATE:
jb.type = jbvString;
jb.val.string.val = JsonEncodeDateTime(NULL, val, DATEOID);
jb.val.string.len = strlen(jb.val.string.val);
break;
case JSONBTYPE_TIMESTAMP:
jb.type = jbvString;
jb.val.string.val = JsonEncodeDateTime(NULL, val, TIMESTAMPOID);
jb.val.string.len = strlen(jb.val.string.val);
break;
case JSONBTYPE_TIMESTAMPTZ:
jb.type = jbvString;
jb.val.string.val = JsonEncodeDateTime(NULL, val, TIMESTAMPTZOID);
jb.val.string.len = strlen(jb.val.string.val);
break;
case JSONBTYPE_JSONCAST:
case JSONBTYPE_JSON:
{
/* parse the json right into the existing result object */
JsonLexContext *lex;
JsonSemAction sem;
text *json = DatumGetTextPP(val);
lex = makeJsonLexContext(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(lex, &sem);
}
break;
case JSONBTYPE_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 = checkStringLen(strlen(outputstr));
jb.val.string.val = outputstr;
break;
}
}
/* Now insert jb into result, unless we did it recursively */
if (!is_null && !scalar_jsonb &&
tcategory >= JSONBTYPE_JSON && tcategory <= JSONBTYPE_JSONCAST)
{
/* 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, JsonbTypeCategory 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(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;
JsonbTypeCategory 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);
jsonb_categorize_type(element_type,
&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;
JsonbTypeCategory 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 = JSONBTYPE_NULL;
outfuncoid = InvalidOid;
}
else
jsonb_categorize_type(att->atttypid, &tcategory, &outfuncoid);
datum_to_jsonb(val, isnull, result, tcategory, outfuncoid, false);
}
result->res = pushJsonbValue(&result->parseState, WJB_END_OBJECT, NULL);
ReleaseTupleDesc(tupdesc);
}
/*
* Append JSON text for "val" to "result".
*
* This is just a thin wrapper around datum_to_jsonb. If the same type will be
* printed many times, avoid using this; better to do the jsonb_categorize_type
* lookups only once.
*/
static void
add_jsonb(Datum val, bool is_null, JsonbInState *result,
Oid val_type, bool key_scalar)
{
JsonbTypeCategory tcategory;
Oid outfuncoid;
if (val_type == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
if (is_null)
{
tcategory = JSONBTYPE_NULL;
outfuncoid = InvalidOid;
}
else
jsonb_categorize_type(val_type,
&tcategory, &outfuncoid);
datum_to_jsonb(val, is_null, result, tcategory, outfuncoid, key_scalar);
}
/*
* SQL function to_jsonb(anyvalue)
*/
Datum
to_jsonb(PG_FUNCTION_ARGS)
{
Datum val = PG_GETARG_DATUM(0);
Oid val_type = get_fn_expr_argtype(fcinfo->flinfo, 0);
JsonbInState result;
JsonbTypeCategory tcategory;
Oid outfuncoid;
if (val_type == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
jsonb_categorize_type(val_type,
&tcategory, &outfuncoid);
memset(&result, 0, sizeof(JsonbInState));
datum_to_jsonb(val, false, &result, tcategory, outfuncoid, false);
PG_RETURN_POINTER(JsonbValueToJsonb(result.res));
}
/*
* SQL function jsonb_build_object(variadic "any")
*/
Datum
jsonb_build_object(PG_FUNCTION_ARGS)
{
int nargs;
int i;
JsonbInState result;
Datum *args;
bool *nulls;
Oid *types;
/* build argument values to build the object */
nargs = extract_variadic_args(fcinfo, 0, true, &args, &types, &nulls);
if (nargs < 0)
PG_RETURN_NULL();
if (nargs % 2 != 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("argument list must have even number of elements"),
/* translator: %s is a SQL function name */
errhint("The arguments of %s must consist of alternating keys and values.",
"jsonb_build_object()")));
memset(&result, 0, sizeof(JsonbInState));
result.res = pushJsonbValue(&result.parseState, WJB_BEGIN_OBJECT, NULL);
for (i = 0; i < nargs; i += 2)
{
/* process key */
if (nulls[i])
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("argument %d: key must not be null", i + 1)));
add_jsonb(args[i], false, &result, types[i], true);
/* process value */
add_jsonb(args[i + 1], nulls[i + 1], &result, types[i + 1], false);
}
result.res = pushJsonbValue(&result.parseState, WJB_END_OBJECT, NULL);
PG_RETURN_POINTER(JsonbValueToJsonb(result.res));
}
/*
* degenerate case of jsonb_build_object where it gets 0 arguments.
*/
Datum
jsonb_build_object_noargs(PG_FUNCTION_ARGS)
{
JsonbInState result;
memset(&result, 0, sizeof(JsonbInState));
(void) pushJsonbValue(&result.parseState, WJB_BEGIN_OBJECT, NULL);
result.res = pushJsonbValue(&result.parseState, WJB_END_OBJECT, NULL);
PG_RETURN_POINTER(JsonbValueToJsonb(result.res));
}
/*
* SQL function jsonb_build_array(variadic "any")
*/
Datum
jsonb_build_array(PG_FUNCTION_ARGS)
{
int nargs;
int i;
JsonbInState result;
Datum *args;
bool *nulls;
Oid *types;
/* build argument values to build the array */
nargs = extract_variadic_args(fcinfo, 0, true, &args, &types, &nulls);
if (nargs < 0)
PG_RETURN_NULL();
memset(&result, 0, sizeof(JsonbInState));
result.res = pushJsonbValue(&result.parseState, WJB_BEGIN_ARRAY, NULL);
for (i = 0; i < nargs; i++)
add_jsonb(args[i], nulls[i], &result, types[i], false);
result.res = pushJsonbValue(&result.parseState, WJB_END_ARRAY, NULL);
PG_RETURN_POINTER(JsonbValueToJsonb(result.res));
}
/*
* degenerate case of jsonb_build_array where it gets 0 arguments.
*/
Datum
jsonb_build_array_noargs(PG_FUNCTION_ARGS)
{
JsonbInState result;
memset(&result, 0, sizeof(JsonbInState));
(void) pushJsonbValue(&result.parseState, WJB_BEGIN_ARRAY, NULL);
result.res = pushJsonbValue(&result.parseState, WJB_END_ARRAY, NULL);
PG_RETURN_POINTER(JsonbValueToJsonb(result.res));
}
/*
* SQL function jsonb_object(text[])
*
* take a one or two dimensional array of text as name value pairs
* for a jsonb object.
*
*/
Datum
jsonb_object(PG_FUNCTION_ARGS)
{
ArrayType *in_array = PG_GETARG_ARRAYTYPE_P(0);
int ndims = ARR_NDIM(in_array);
Datum *in_datums;
bool *in_nulls;
int in_count,
count,
i;
JsonbInState result;
memset(&result, 0, sizeof(JsonbInState));
(void) pushJsonbValue(&result.parseState, WJB_BEGIN_OBJECT, NULL);
switch (ndims)
{
case 0:
goto close_object;
break;
case 1:
if ((ARR_DIMS(in_array)[0]) % 2)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("array must have even number of elements")));
break;
case 2:
if ((ARR_DIMS(in_array)[1]) != 2)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("array must have two columns")));
break;
default:
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("wrong number of array subscripts")));
}
deconstruct_array(in_array,
TEXTOID, -1, false, 'i',
&in_datums, &in_nulls, &in_count);
count = in_count / 2;
for (i = 0; i < count; ++i)
{
JsonbValue v;
char *str;
int len;
if (in_nulls[i * 2])
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("null value not allowed for object key")));
str = TextDatumGetCString(in_datums[i * 2]);
len = strlen(str);
v.type = jbvString;
v.val.string.len = len;
v.val.string.val = str;
(void) pushJsonbValue(&result.parseState, WJB_KEY, &v);
if (in_nulls[i * 2 + 1])
{
v.type = jbvNull;
}
else
{
str = TextDatumGetCString(in_datums[i * 2 + 1]);
len = strlen(str);
v.type = jbvString;
v.val.string.len = len;
v.val.string.val = str;
}
(void) pushJsonbValue(&result.parseState, WJB_VALUE, &v);
}
pfree(in_datums);
pfree(in_nulls);
close_object:
result.res = pushJsonbValue(&result.parseState, WJB_END_OBJECT, NULL);
PG_RETURN_POINTER(JsonbValueToJsonb(result.res));
}
/*
* SQL function jsonb_object(text[], text[])
*
* take separate name and value arrays of text to construct a jsonb object
* pairwise.
*/
Datum
jsonb_object_two_arg(PG_FUNCTION_ARGS)
{
ArrayType *key_array = PG_GETARG_ARRAYTYPE_P(0);
ArrayType *val_array = PG_GETARG_ARRAYTYPE_P(1);
int nkdims = ARR_NDIM(key_array);
int nvdims = ARR_NDIM(val_array);
Datum *key_datums,
*val_datums;
bool *key_nulls,
*val_nulls;
int key_count,
val_count,
i;
JsonbInState result;
memset(&result, 0, sizeof(JsonbInState));
(void) pushJsonbValue(&result.parseState, WJB_BEGIN_OBJECT, NULL);
if (nkdims > 1 || nkdims != nvdims)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("wrong number of array subscripts")));
if (nkdims == 0)
goto close_object;
deconstruct_array(key_array,
TEXTOID, -1, false, 'i',
&key_datums, &key_nulls, &key_count);
deconstruct_array(val_array,
TEXTOID, -1, false, 'i',
&val_datums, &val_nulls, &val_count);
if (key_count != val_count)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("mismatched array dimensions")));
for (i = 0; i < key_count; ++i)
{
JsonbValue v;
char *str;
int len;
if (key_nulls[i])
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("null value not allowed for object key")));
str = TextDatumGetCString(key_datums[i]);
len = strlen(str);
v.type = jbvString;
v.val.string.len = len;
v.val.string.val = str;
(void) pushJsonbValue(&result.parseState, WJB_KEY, &v);
if (val_nulls[i])
{
v.type = jbvNull;
}
else
{
str = TextDatumGetCString(val_datums[i]);
len = strlen(str);
v.type = jbvString;
v.val.string.len = len;
v.val.string.val = str;
}
(void) pushJsonbValue(&result.parseState, WJB_VALUE, &v);
}
pfree(key_datums);
pfree(key_nulls);
pfree(val_datums);
pfree(val_nulls);
close_object:
result.res = pushJsonbValue(&result.parseState, WJB_END_OBJECT, NULL);
PG_RETURN_POINTER(JsonbValueToJsonb(result.res));
}
/*
* shallow clone of a parse state, suitable for use in aggregate
* final functions that will only append to the values rather than
* change them.
*/
static JsonbParseState *
clone_parse_state(JsonbParseState *state)
{
JsonbParseState *result,
*icursor,
*ocursor;
if (state == NULL)
return NULL;
result = palloc(sizeof(JsonbParseState));
icursor = state;
ocursor = result;
for (;;)
{
ocursor->contVal = icursor->contVal;
ocursor->size = icursor->size;
icursor = icursor->next;
if (icursor == NULL)
break;
ocursor->next = palloc(sizeof(JsonbParseState));
ocursor = ocursor->next;
}
ocursor->next = NULL;
return result;
}
/*
* jsonb_agg aggregate function
*/
Datum
jsonb_agg_transfn(PG_FUNCTION_ARGS)
{
MemoryContext oldcontext,
aggcontext;
JsonbAggState *state;
JsonbInState elem;
Datum val;
JsonbInState *result;
bool single_scalar = false;
JsonbIterator *it;
Jsonb *jbelem;
JsonbValue v;
JsonbIteratorToken type;
if (!AggCheckCallContext(fcinfo, &aggcontext))
{
/* cannot be called directly because of internal-type argument */
elog(ERROR, "jsonb_agg_transfn called in non-aggregate context");
}
/* set up the accumulator on the first go round */
if (PG_ARGISNULL(0))
{
Oid arg_type = get_fn_expr_argtype(fcinfo->flinfo, 1);
if (arg_type == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
oldcontext = MemoryContextSwitchTo(aggcontext);
state = palloc(sizeof(JsonbAggState));
result = palloc0(sizeof(JsonbInState));
state->res = result;
result->res = pushJsonbValue(&result->parseState,
WJB_BEGIN_ARRAY, NULL);
MemoryContextSwitchTo(oldcontext);
jsonb_categorize_type(arg_type, &state->val_category,
&state->val_output_func);
}
else
{
state = (JsonbAggState *) PG_GETARG_POINTER(0);
result = state->res;
}
/* turn the argument into jsonb in the normal function context */
val = PG_ARGISNULL(1) ? (Datum) 0 : PG_GETARG_DATUM(1);
memset(&elem, 0, sizeof(JsonbInState));
datum_to_jsonb(val, PG_ARGISNULL(1), &elem, state->val_category,
state->val_output_func, false);
jbelem = JsonbValueToJsonb(elem.res);
/* switch to the aggregate context for accumulation operations */
oldcontext = MemoryContextSwitchTo(aggcontext);
it = JsonbIteratorInit(&jbelem->root);
while ((type = JsonbIteratorNext(&it, &v, false)) != WJB_DONE)
{
switch (type)
{
case WJB_BEGIN_ARRAY:
if (v.val.array.rawScalar)
single_scalar = true;
else
result->res = pushJsonbValue(&result->parseState,
type, NULL);
break;
case WJB_END_ARRAY:
if (!single_scalar)
result->res = pushJsonbValue(&result->parseState,
type, NULL);
break;
case WJB_BEGIN_OBJECT:
case WJB_END_OBJECT:
result->res = pushJsonbValue(&result->parseState,
type, NULL);
break;
case WJB_ELEM:
case WJB_KEY:
case WJB_VALUE:
if (v.type == jbvString)
{
/* copy string values in the aggregate context */
char *buf = palloc(v.val.string.len + 1);
snprintf(buf, v.val.string.len + 1, "%s", v.val.string.val);
v.val.string.val = buf;
}
else if (v.type == jbvNumeric)
{
/* same for numeric */
v.val.numeric =
DatumGetNumeric(DirectFunctionCall1(numeric_uplus,
NumericGetDatum(v.val.numeric)));
}
result->res = pushJsonbValue(&result->parseState,
type, &v);
break;
default:
elog(ERROR, "unknown jsonb iterator token type");
}
}
MemoryContextSwitchTo(oldcontext);
PG_RETURN_POINTER(state);
}
Datum
jsonb_agg_finalfn(PG_FUNCTION_ARGS)
{
JsonbAggState *arg;
JsonbInState result;
Jsonb *out;
/* cannot be called directly because of internal-type argument */
Assert(AggCheckCallContext(fcinfo, NULL));
if (PG_ARGISNULL(0))
PG_RETURN_NULL(); /* returns null iff no input values */
arg = (JsonbAggState *) PG_GETARG_POINTER(0);
/*
* We need to do a shallow clone of the argument in case the final
* function is called more than once, so we avoid changing the argument. A
* shallow clone is sufficient as we aren't going to change any of the
* values, just add the final array end marker.
*/
result.parseState = clone_parse_state(arg->res->parseState);
result.res = pushJsonbValue(&result.parseState,
WJB_END_ARRAY, NULL);
out = JsonbValueToJsonb(result.res);
PG_RETURN_POINTER(out);
}
/*
* jsonb_object_agg aggregate function
*/
Datum
jsonb_object_agg_transfn(PG_FUNCTION_ARGS)
{
MemoryContext oldcontext,
aggcontext;
JsonbInState elem;
JsonbAggState *state;
Datum val;
JsonbInState *result;
bool single_scalar;
JsonbIterator *it;
Jsonb *jbkey,
*jbval;
JsonbValue v;
JsonbIteratorToken type;
if (!AggCheckCallContext(fcinfo, &aggcontext))
{
/* cannot be called directly because of internal-type argument */
elog(ERROR, "jsonb_object_agg_transfn called in non-aggregate context");
}
/* set up the accumulator on the first go round */
if (PG_ARGISNULL(0))
{
Oid arg_type;
oldcontext = MemoryContextSwitchTo(aggcontext);
state = palloc(sizeof(JsonbAggState));
result = palloc0(sizeof(JsonbInState));
state->res = result;
result->res = pushJsonbValue(&result->parseState,
WJB_BEGIN_OBJECT, NULL);
MemoryContextSwitchTo(oldcontext);
arg_type = get_fn_expr_argtype(fcinfo->flinfo, 1);
if (arg_type == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
jsonb_categorize_type(arg_type, &state->key_category,
&state->key_output_func);
arg_type = get_fn_expr_argtype(fcinfo->flinfo, 2);
if (arg_type == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
jsonb_categorize_type(arg_type, &state->val_category,
&state->val_output_func);
}
else
{
state = (JsonbAggState *) PG_GETARG_POINTER(0);
result = state->res;
}
/* turn the argument into jsonb in the normal function context */
if (PG_ARGISNULL(1))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("field name must not be null")));
val = PG_GETARG_DATUM(1);
memset(&elem, 0, sizeof(JsonbInState));
datum_to_jsonb(val, false, &elem, state->key_category,
state->key_output_func, true);
jbkey = JsonbValueToJsonb(elem.res);
val = PG_ARGISNULL(2) ? (Datum) 0 : PG_GETARG_DATUM(2);
memset(&elem, 0, sizeof(JsonbInState));
datum_to_jsonb(val, PG_ARGISNULL(2), &elem, state->val_category,
state->val_output_func, false);
jbval = JsonbValueToJsonb(elem.res);
it = JsonbIteratorInit(&jbkey->root);
/* switch to the aggregate context for accumulation operations */
oldcontext = MemoryContextSwitchTo(aggcontext);
/*
* keys should be scalar, and we should have already checked for that
* above when calling datum_to_jsonb, so we only need to look for these
* things.
*/
while ((type = JsonbIteratorNext(&it, &v, false)) != WJB_DONE)
{
switch (type)
{
case WJB_BEGIN_ARRAY:
if (!v.val.array.rawScalar)
elog(ERROR, "unexpected structure for key");
break;
case WJB_ELEM:
if (v.type == jbvString)
{
/* copy string values in the aggregate context */
char *buf = palloc(v.val.string.len + 1);
snprintf(buf, v.val.string.len + 1, "%s", v.val.string.val);
v.val.string.val = buf;
}
else
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("object keys must be strings")));
}
result->res = pushJsonbValue(&result->parseState,
WJB_KEY, &v);
break;
case WJB_END_ARRAY:
break;
default:
elog(ERROR, "unexpected structure for key");
break;
}
}
it = JsonbIteratorInit(&jbval->root);
single_scalar = false;
/*
* values can be anything, including structured and null, so we treat them
* as in json_agg_transfn, except that single scalars are always pushed as
* WJB_VALUE items.
*/
while ((type = JsonbIteratorNext(&it, &v, false)) != WJB_DONE)
{
switch (type)
{
case WJB_BEGIN_ARRAY:
if (v.val.array.rawScalar)
single_scalar = true;
else
result->res = pushJsonbValue(&result->parseState,
type, NULL);
break;
case WJB_END_ARRAY:
if (!single_scalar)
result->res = pushJsonbValue(&result->parseState,
type, NULL);
break;
case WJB_BEGIN_OBJECT:
case WJB_END_OBJECT:
result->res = pushJsonbValue(&result->parseState,
type, NULL);
break;
case WJB_ELEM:
case WJB_KEY:
case WJB_VALUE:
if (v.type == jbvString)
{
/* copy string values in the aggregate context */
char *buf = palloc(v.val.string.len + 1);
snprintf(buf, v.val.string.len + 1, "%s", v.val.string.val);
v.val.string.val = buf;
}
else if (v.type == jbvNumeric)
{
/* same for numeric */
v.val.numeric =
DatumGetNumeric(DirectFunctionCall1(numeric_uplus,
NumericGetDatum(v.val.numeric)));
}
result->res = pushJsonbValue(&result->parseState,
single_scalar ? WJB_VALUE : type,
&v);
break;
default:
elog(ERROR, "unknown jsonb iterator token type");
}
}
MemoryContextSwitchTo(oldcontext);
PG_RETURN_POINTER(state);
}
Datum
jsonb_object_agg_finalfn(PG_FUNCTION_ARGS)
{
JsonbAggState *arg;
JsonbInState result;
Jsonb *out;
/* cannot be called directly because of internal-type argument */
Assert(AggCheckCallContext(fcinfo, NULL));
if (PG_ARGISNULL(0))
PG_RETURN_NULL(); /* returns null iff no input values */
arg = (JsonbAggState *) PG_GETARG_POINTER(0);
/*
* We need to do a shallow clone of the argument's res field in case the
* final function is called more than once, so we avoid changing the
* aggregate state value. A shallow clone is sufficient as we aren't
* going to change any of the values, just add the final object end
* marker.
*/
result.parseState = clone_parse_state(arg->res->parseState);
result.res = pushJsonbValue(&result.parseState,
WJB_END_OBJECT, NULL);
out = JsonbValueToJsonb(result.res);
PG_RETURN_POINTER(out);
}
/*
* Extract scalar value from raw-scalar pseudo-array jsonb.
*/
bool
JsonbExtractScalar(JsonbContainer *jbc, JsonbValue *res)
{
JsonbIterator *it;
JsonbIteratorToken tok PG_USED_FOR_ASSERTS_ONLY;
JsonbValue tmp;
if (!JsonContainerIsArray(jbc) || !JsonContainerIsScalar(jbc))
{
/* inform caller about actual type of container */
res->type = (JsonContainerIsArray(jbc)) ? jbvArray : jbvObject;
return false;
}
/*
* A root scalar is stored as an array of one element, so we get the array
* and then its first (and only) member.
*/
it = JsonbIteratorInit(jbc);
tok = JsonbIteratorNext(&it, &tmp, true);
Assert(tok == WJB_BEGIN_ARRAY);
Assert(tmp.val.array.nElems == 1 && tmp.val.array.rawScalar);
tok = JsonbIteratorNext(&it, res, true);
Assert(tok == WJB_ELEM);
Assert(IsAJsonbScalar(res));
tok = JsonbIteratorNext(&it, &tmp, true);
Assert(tok == WJB_END_ARRAY);
tok = JsonbIteratorNext(&it, &tmp, true);
Assert(tok == WJB_DONE);
return true;
}
/*
* Emit correct, translatable cast error message
*/
static void
cannotCastJsonbValue(enum jbvType type, const char *sqltype)
{
static const struct
{
enum jbvType type;
const char *msg;
}
messages[] =
{
{jbvNull, gettext_noop("cannot cast jsonb null to type %s")},
{jbvString, gettext_noop("cannot cast jsonb string to type %s")},
{jbvNumeric, gettext_noop("cannot cast jsonb numeric to type %s")},
{jbvBool, gettext_noop("cannot cast jsonb boolean to type %s")},
{jbvArray, gettext_noop("cannot cast jsonb array to type %s")},
{jbvObject, gettext_noop("cannot cast jsonb object to type %s")},
{jbvBinary, gettext_noop("cannot cast jsonb array or object to type %s")}
};
int i;
for (i = 0; i < lengthof(messages); i++)
if (messages[i].type == type)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg(messages[i].msg, sqltype)));
/* should be unreachable */
elog(ERROR, "unknown jsonb type: %d", (int) type);
}
Datum
jsonb_bool(PG_FUNCTION_ARGS)
{
Jsonb *in = PG_GETARG_JSONB_P(0);
JsonbValue v;
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvBool)
cannotCastJsonbValue(v.type, "boolean");
PG_FREE_IF_COPY(in, 0);
PG_RETURN_BOOL(v.val.boolean);
}
Datum
jsonb_numeric(PG_FUNCTION_ARGS)
{
Jsonb *in = PG_GETARG_JSONB_P(0);
JsonbValue v;
Numeric retValue;
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
cannotCastJsonbValue(v.type, "numeric");
/*
* v.val.numeric points into jsonb body, so we need to make a copy to
* return
*/
retValue = DatumGetNumericCopy(NumericGetDatum(v.val.numeric));
PG_FREE_IF_COPY(in, 0);
PG_RETURN_NUMERIC(retValue);
}
Datum
jsonb_int2(PG_FUNCTION_ARGS)
{
Jsonb *in = PG_GETARG_JSONB_P(0);
JsonbValue v;
Datum retValue;
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
cannotCastJsonbValue(v.type, "smallint");
retValue = DirectFunctionCall1(numeric_int2,
NumericGetDatum(v.val.numeric));
PG_FREE_IF_COPY(in, 0);
PG_RETURN_DATUM(retValue);
}
Datum
jsonb_int4(PG_FUNCTION_ARGS)
{
Jsonb *in = PG_GETARG_JSONB_P(0);
JsonbValue v;
Datum retValue;
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
cannotCastJsonbValue(v.type, "integer");
retValue = DirectFunctionCall1(numeric_int4,
NumericGetDatum(v.val.numeric));
PG_FREE_IF_COPY(in, 0);
PG_RETURN_DATUM(retValue);
}
Datum
jsonb_int8(PG_FUNCTION_ARGS)
{
Jsonb *in = PG_GETARG_JSONB_P(0);
JsonbValue v;
Datum retValue;
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
cannotCastJsonbValue(v.type, "bigint");
retValue = DirectFunctionCall1(numeric_int8,
NumericGetDatum(v.val.numeric));
PG_FREE_IF_COPY(in, 0);
PG_RETURN_DATUM(retValue);
}
Datum
jsonb_float4(PG_FUNCTION_ARGS)
{
Jsonb *in = PG_GETARG_JSONB_P(0);
JsonbValue v;
Datum retValue;
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
cannotCastJsonbValue(v.type, "real");
retValue = DirectFunctionCall1(numeric_float4,
NumericGetDatum(v.val.numeric));
PG_FREE_IF_COPY(in, 0);
PG_RETURN_DATUM(retValue);
}
Datum
jsonb_float8(PG_FUNCTION_ARGS)
{
Jsonb *in = PG_GETARG_JSONB_P(0);
JsonbValue v;
Datum retValue;
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
cannotCastJsonbValue(v.type, "double precision");
retValue = DirectFunctionCall1(numeric_float8,
NumericGetDatum(v.val.numeric));
PG_FREE_IF_COPY(in, 0);
PG_RETURN_DATUM(retValue);
}
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