Function jsonget_string

storage/connect/jsonudf.cpp:3567–3644

} // end of jsonget_string_init

char *jsonget_string(UDF_INIT *initid, UDF_ARGS *args, char *result,
	unsigned long *res_length, uchar *is_null, uchar *)
{
	char   *p, *path, *str = NULL;
	PJSON   jsp;
	PJSNX   jsx;
	PJVAL   jvp;
	PGLOBAL g = (PGLOBAL)initid->ptr;

	if (g->N) {
		str = (char*)g->Activityp;
		goto err;
	} else if (initid->const_item)
		g->N = 1;

	try {
		if (!g->Xchk) {
			if (CheckMemory(g, initid, args, 1, true)) {
				PUSH_WARNING("CheckMemory error");
				goto err;
			} else
				jvp = MakeValue(g, args, 0);

			if ((p = jvp->GetString(g))) {
				if (!(jsp = ParseJson(g, p, strlen(p)))) {
					PUSH_WARNING(g->Message);
					goto err;
				} // endif jsp

			} else
				jsp = jvp->GetJson();

			if (g->Mrr) {			 // First argument is a constant
				g->Xchk = jsp;
				JsonMemSave(g);
			} // endif Mrr

		} else
			jsp = (PJSON)g->Xchk;

		path = MakePSZ(g, args, 1);
		jsx = JsnxNew(g, jsp, TYPE_STRING, initid->max_length);

		if (!jsx || jsx->SetJpath(g, path)) {
			PUSH_WARNING(g->Message);
			goto err;
		}	// endif SetJpath

		jsx->ReadValue(g);

		if (!jsx->GetValue()->IsNull())
			str = jsx->GetValue()->GetCharValue();

		if (initid->const_item)
			// Keep result of constant function
			g->Activityp = (PACTIVITY)str;

	} catch (int n) {