/root/doris/be/src/exprs/json_functions.cpp

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#include "exprs/json_functions.h"

#include <rapidjson/allocators.h>
#include <rapidjson/document.h>
#include <rapidjson/encodings.h>
#include <rapidjson/rapidjson.h>
#include <re2/re2.h>
#include <simdjson/error.h>
#include <simdjson/simdjson.h> // IWYU pragma: keep
#include <stdlib.h>

#include <boost/iterator/iterator_facade.hpp>
#include <boost/token_functions.hpp>
#include <boost/tokenizer.hpp>
#include <sstream>
#include <string>
#include <vector>

// IWYU pragma: no_include <opentelemetry/common/threadlocal.h>
#include "common/compiler_util.h" // IWYU pragma: keep
#include "common/exception.h"
#include "common/logging.h"

namespace doris {

// static const re2::RE2 JSON_PATTERN("^([a-zA-Z0-9_\\-\\:\\s#\\|\\.]*)(?:\\[([0-9]+)\\])?");
// json path cannot contains: ", [, ]
static const re2::RE2 JSON_PATTERN("^([^\\\"\\[\\]]*)(?:\\[([0-9]+|\\*)\\])?");

rapidjson::Value* JsonFunctions::match_value(const std::vector<JsonPath>& parsed_paths,
                                             rapidjson::Value* document,
                                             rapidjson::Document::AllocatorType& mem_allocator,
                                             bool is_insert_null) {
    rapidjson::Value* root = document;
    rapidjson::Value* array_obj = nullptr;
    for (int i = 1; i < parsed_paths.size(); i++) {
        VLOG_TRACE << "parsed_paths: " << parsed_paths[i].debug_string();

        if (root == nullptr || root->IsNull()) {
            return nullptr;
        }

        if (UNLIKELY(!parsed_paths[i].is_valid)) {
            return nullptr;
        }

        const std::string& col = parsed_paths[i].key;
        int index = parsed_paths[i].idx;
        if (LIKELY(!col.empty())) {
            if (root->IsArray()) {
                array_obj = static_cast<rapidjson::Value*>(
                        mem_allocator.Malloc(sizeof(rapidjson::Value)));
                array_obj->SetArray();
                bool is_null = true;

                // if array ,loop the array,find out all Objects,then find the results from the objects
                for (int j = 0; j < root->Size(); j++) {
                    rapidjson::Value* json_elem = &((*root)[j]);

                    if (json_elem->IsArray() || json_elem->IsNull()) {
                        continue;
                    } else {
                        if (!json_elem->IsObject()) {
                            continue;
                        }
                        if (!json_elem->HasMember(col.c_str())) {
                            if (is_insert_null) { // not found item, then insert a null object.
                                is_null = false;
                                rapidjson::Value nullObject(rapidjson::kNullType);
                                array_obj->PushBack(nullObject, mem_allocator);
                            }
                            continue;
                        }
                        rapidjson::Value* obj = &((*json_elem)[col.c_str()]);
                        if (obj->IsArray()) {
                            is_null = false;
                            for (int k = 0; k < obj->Size(); k++) {
                                array_obj->PushBack((*obj)[k], mem_allocator);
                            }
                        } else if (!obj->IsNull()) {
                            is_null = false;
                            array_obj->PushBack(*obj, mem_allocator);
                        }
                    }
                }

                root = is_null ? &(array_obj->SetNull()) : array_obj;
            } else if (root->IsObject()) {
                if (!root->HasMember(col.c_str())) {
                    return nullptr;
                } else {
                    root = &((*root)[col.c_str()]);
                }
            } else {
                // root is not a nested type, return nullptr
                return nullptr;
            }
        }

        if (UNLIKELY(index != -1)) {
            // judge the rapidjson:Value, which base the top's result,
            // if not array return nullptr;else get the index value from the array
            if (root->IsArray()) {
                if (root->IsNull()) {
                    return nullptr;
                } else if (index == -2) {
                    // [*]
                    array_obj = static_cast<rapidjson::Value*>(
                            mem_allocator.Malloc(sizeof(rapidjson::Value)));
                    array_obj->SetArray();

                    for (int j = 0; j < root->Size(); j++) {
                        rapidjson::Value v;
                        v.CopyFrom((*root)[j], mem_allocator);
                        array_obj->PushBack(v, mem_allocator);
                    }
                    root = array_obj;
                } else if (index >= root->Size()) {
                    return nullptr;
                } else {
                    root = &((*root)[index]);
                }
            } else {
                return nullptr;
            }
        }
    }
    return root;
}

rapidjson::Value* JsonFunctions::get_json_array_from_parsed_json(
        const std::string& json_path, rapidjson::Value* document,
        rapidjson::Document::AllocatorType& mem_allocator, bool* wrap_explicitly) {
    std::vector<JsonPath> vec;
    parse_json_paths(json_path, &vec);
    return get_json_array_from_parsed_json(vec, document, mem_allocator, wrap_explicitly);
}

rapidjson::Value* JsonFunctions::get_json_array_from_parsed_json(
        const std::vector<JsonPath>& parsed_paths, rapidjson::Value* document,
        rapidjson::Document::AllocatorType& mem_allocator, bool* wrap_explicitly) {
    *wrap_explicitly = false;
    if (!parsed_paths[0].is_valid) {
        return nullptr;
    }

    if (parsed_paths.size() == 1) {
        // the json path is "$", just return entire document
        // wrapper an array
        rapidjson::Value* array_obj = nullptr;
        array_obj = static_cast<rapidjson::Value*>(mem_allocator.Malloc(sizeof(rapidjson::Value)));
        array_obj->SetArray();
        array_obj->PushBack(*document, mem_allocator);
        return array_obj;
    }

    rapidjson::Value* root = match_value(parsed_paths, document, mem_allocator, true);
    if (root == nullptr || root == document) { // not found
        return nullptr;
    } else if (!root->IsArray() && wrap_explicitly) {
        rapidjson::Value* array_obj = nullptr;
        array_obj = static_cast<rapidjson::Value*>(mem_allocator.Malloc(sizeof(rapidjson::Value)));
        array_obj->SetArray();
        rapidjson::Value copy;
        copy.CopyFrom(*root, mem_allocator);
        array_obj->PushBack(std::move(copy), mem_allocator);
        // set `wrap_explicitly` to true, so that the caller knows that this Array is wrapped actively.
        *wrap_explicitly = true;
        return array_obj;
    }
    return root;
}

rapidjson::Value* JsonFunctions::get_json_object_from_parsed_json(
        const std::vector<JsonPath>& parsed_paths, rapidjson::Value* document,
        rapidjson::Document::AllocatorType& mem_allocator) {
    if (!parsed_paths[0].is_valid) {
        return nullptr;
    }

    if (parsed_paths.size() == 1) {
        // the json path is "$", just return entire document
        return document;
    }

    rapidjson::Value* root = match_value(parsed_paths, document, mem_allocator, true);
    if (root == nullptr || root == document) { // not found
        return nullptr;
    }
    return root;
}

void JsonFunctions::parse_json_paths(const std::string& path_string,
                                     std::vector<JsonPath>* parsed_paths) {
    // split path by ".", and escape quota by "\"
    // eg:
    //    '$.text#abc.xyz'  ->  [$, text#abc, xyz]
    //    '$."text.abc".xyz'  ->  [$, text.abc, xyz]
    //    '$."text.abc"[1].xyz'  ->  [$, text.abc[1], xyz]
    try {
        boost::tokenizer<boost::escaped_list_separator<char>> tok(
                path_string, boost::escaped_list_separator<char>("\\", ".", "\""));
        std::vector<std::string> paths(tok.begin(), tok.end());
        get_parsed_paths(paths, parsed_paths);
    } catch (const boost::escaped_list_error& err) {
        throw doris::Exception(ErrorCode::INVALID_JSON_PATH, "meet error {}", err.what());
    }
}

void JsonFunctions::get_parsed_paths(const std::vector<std::string>& path_exprs,
                                     std::vector<JsonPath>* parsed_paths) {
    if (path_exprs.empty()) {
        return;
    }

    if (path_exprs[0] != "$") {
        parsed_paths->emplace_back("", -1, false);
    } else {
        parsed_paths->emplace_back("$", -1, true);
    }

    for (int i = 1; i < path_exprs.size(); i++) {
        std::string col;
        std::string index;
        if (UNLIKELY(!RE2::FullMatch(path_exprs[i], JSON_PATTERN, &col, &index))) {
            parsed_paths->emplace_back("", -1, false);
        } else {
            int idx = -1;
            if (!index.empty()) {
                if (index == "*") {
                    idx = -2;
                } else {
                    idx = atoi(index.c_str());
                }
            }
            parsed_paths->emplace_back(std::move(col), idx, true);
        }
    }
}

Status JsonFunctions::extract_from_object(simdjson::ondemand::object& obj,
                                          const std::vector<JsonPath>& jsonpath,
                                          simdjson::ondemand::value* value) noexcept {
// Return DataQualityError when it's a malformed json.
// Otherwise the path was not found, due to
// 1. array out of bound
// 2. not exist such field in object
// 3. the input type is not object but could be null or other types and lead to simdjson::INCORRECT_TYPE
#define HANDLE_SIMDJSON_ERROR(err, msg)                                                     \
    do {                                                                                    \
        const simdjson::error_code& _err = err;                                             \
        const std::string& _msg = msg;                                                      \
        if (UNLIKELY(_err)) {                                                               \
            if (_err == simdjson::NO_SUCH_FIELD || _err == simdjson::INDEX_OUT_OF_BOUNDS || \
                _err == simdjson::INCORRECT_TYPE) {                                         \
                return Status::NotFound<false>(                                             \
                        fmt::format("Not found target filed, err: {}, msg: {}",             \
                                    simdjson::error_message(_err), _msg));                  \
            }                                                                               \
            return Status::DataQualityError(                                                \
                    fmt::format("err: {}, msg: {}", simdjson::error_message(_err), _msg));  \
        }                                                                                   \
    } while (false);

    if (jsonpath.size() <= 1) {
        // The first elem of json path should be '$'.
        // A valid json path's size is >= 2.
        return Status::DataQualityError("empty json path");
    }

    simdjson::ondemand::value tvalue;

    // Skip the first $.
    for (int i = 1; i < jsonpath.size(); i++) {
        if (UNLIKELY(!jsonpath[i].is_valid)) {
            return Status::DataQualityError(fmt::format("invalid json path: {}", jsonpath[i].key));
        }

        const std::string& col = jsonpath[i].key;
        int index = jsonpath[i].idx;

        // Since the simdjson::ondemand::object cannot be converted to simdjson::ondemand::value,
        // we have to do some special treatment for the second elem of json path.
        // If the key is not found in json object, simdjson::NO_SUCH_FIELD would be returned.
        if (i == 1) {
            HANDLE_SIMDJSON_ERROR(obj.find_field_unordered(col).get(tvalue),
                                  fmt::format("unable to find field: {}", col));
        } else {
            HANDLE_SIMDJSON_ERROR(tvalue.find_field_unordered(col).get(tvalue),
                                  fmt::format("unable to find field: {}", col));
        }

        // TODO support [*] which idex == -2
        if (index != -1) {
            // try to access tvalue as array.
            // If the index is beyond the length of array, simdjson::INDEX_OUT_OF_BOUNDS would be returned.
            simdjson::ondemand::array arr;
            HANDLE_SIMDJSON_ERROR(tvalue.get_array().get(arr),
                                  fmt::format("failed to access field as array, field: {}", col));

            HANDLE_SIMDJSON_ERROR(
                    arr.at(index).get(tvalue),
                    fmt::format("failed to access array field: {}, index: {}", col, index));
        }
    }

    std::swap(*value, tvalue);

    return Status::OK();
}

} // namespace doris

Coverage Report

Created: 2024-11-20 12:56

Line	Count	Source (jump to first uncovered line)
1		// Licensed to the Apache Software Foundation (ASF) under one
2		// or more contributor license agreements. See the NOTICE file
3		// distributed with this work for additional information
4		// regarding copyright ownership. The ASF licenses this file
5		// to you under the Apache License, Version 2.0 (the
6		// "License"); you may not use this file except in compliance
7		// with the License. You may obtain a copy of the License at
8		//
9		// http://www.apache.org/licenses/LICENSE-2.0
10		//
11		// Unless required by applicable law or agreed to in writing,
12		// software distributed under the License is distributed on an
13		// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14		// KIND, either express or implied. See the License for the
15		// specific language governing permissions and limitations
16		// under the License.
17
18		#include "exprs/json_functions.h"
19
20		#include <rapidjson/allocators.h>
21		#include <rapidjson/document.h>
22		#include <rapidjson/encodings.h>
23		#include <rapidjson/rapidjson.h>
24		#include <re2/re2.h>
25		#include <simdjson/error.h>
26		#include <simdjson/simdjson.h> // IWYU pragma: keep
27		#include <stdlib.h>
28
29		#include <boost/iterator/iterator_facade.hpp>
30		#include <boost/token_functions.hpp>
31		#include <boost/tokenizer.hpp>
32		#include <sstream>
33		#include <string>
34		#include <vector>
35
36		// IWYU pragma: no_include <opentelemetry/common/threadlocal.h>
37		#include "common/compiler_util.h" // IWYU pragma: keep
38		#include "common/exception.h"
39		#include "common/logging.h"
40
41		namespace doris {
42
43		// static const re2::RE2 JSON_PATTERN("^([a-zA-Z0-9_\\-\\:\\s#\\\|\\.]*)(?:\\[([0-9]+)\\])?");
44		// json path cannot contains: ", [, ]
45		static const re2::RE2 JSON_PATTERN("^([^\\\"\\[\\]])(?:\\[([0-9]+\|\\)\\])?");
46
47		rapidjson::Value* JsonFunctions::match_value(const std::vector<JsonPath>& parsed_paths,
48		rapidjson::Value* document,
49		rapidjson::Document::AllocatorType& mem_allocator,
50	8	bool is_insert_null) {
51	8	rapidjson::Value* root = document;
52	8	rapidjson::Value* array_obj = nullptr;
53	21	for (int i = 1; i < parsed_paths.size(); i++) {
54	13	VLOG_TRACE << "parsed_paths: " << parsed_paths[i].debug_string();
55
56	13	if (root == nullptr \|\| root->IsNull()) {
57	0	return nullptr;
58	0	}
59
60	13	if (UNLIKELY(!parsed_paths[i].is_valid)) {
61	0	return nullptr;
62	0	}
63
64	13	const std::string& col = parsed_paths[i].key;
65	13	int index = parsed_paths[i].idx;
66	13	if (LIKELY(!col.empty())) {
67	9	if (root->IsArray()) {
68	5	array_obj = static_cast<rapidjson::Value*>(
69	5	mem_allocator.Malloc(sizeof(rapidjson::Value)));
70	5	array_obj->SetArray();
71	5	bool is_null = true;
72
73		// if array ,loop the array,find out all Objects,then find the results from the objects
74	16	for (int j = 0; j < root->Size(); j++) {
75	11	rapidjson::Value* json_elem = &((*root)[j]);
76
77	11	if (json_elem->IsArray() \|\| json_elem->IsNull()) {
78	0	continue;
79	11	} else {
80	11	if (!json_elem->IsObject()) {
81	0	continue;
82	0	}
83	11	if (!json_elem->HasMember(col.c_str())) {
84	1	if (is_insert_null) { // not found item, then insert a null object.
85	1	is_null = false;
86	1	rapidjson::Value nullObject(rapidjson::kNullType);
87	1	array_obj->PushBack(nullObject, mem_allocator);
88	1	}
89	1	continue;
90	1	}
91	10	rapidjson::Value* obj = &((*json_elem)[col.c_str()]);
92	10	if (obj->IsArray()) {
93	0	is_null = false;
94	0	for (int k = 0; k < obj->Size(); k++) {
95	0	array_obj->PushBack((*obj)[k], mem_allocator);
96	0	}
97	10	} else if (!obj->IsNull()) {
98	10	is_null = false;
99	10	array_obj->PushBack(*obj, mem_allocator);
100	10	}
101	10	}
102	11	}
103
104	5	root = is_null ? &(array_obj->SetNull()) : array_obj;
105	5	} else if (root->IsObject()) {
106	4	if (!root->HasMember(col.c_str())) {
107	0	return nullptr;
108	4	} else {
109	4	root = &((*root)[col.c_str()]);
110	4	}
111	4	} else {
112		// root is not a nested type, return nullptr
113	0	return nullptr;
114	0	}
115	9	}
116
117	13	if (UNLIKELY(index != -1)) {
118		// judge the rapidjson:Value, which base the top's result,
119		// if not array return nullptr;else get the index value from the array
120	4	if (root->IsArray()) {
121	4	if (root->IsNull()) {
122	0	return nullptr;
123	4	} else if (index == -2) {
124		// [*]
125	4	array_obj = static_cast<rapidjson::Value*>(
126	4	mem_allocator.Malloc(sizeof(rapidjson::Value)));
127	4	array_obj->SetArray();
128
129	13	for (int j = 0; j < root->Size(); j++) {
130	9	rapidjson::Value v;
131	9	v.CopyFrom((*root)[j], mem_allocator);
132	9	array_obj->PushBack(v, mem_allocator);
133	9	}
134	4	root = array_obj;
135	4	} else if (index >= root->Size()) {
136	0	return nullptr;
137	0	} else {
138	0	root = &((*root)[index]);
139	0	}
140	4	} else {
141	0	return nullptr;
142	0	}
143	4	}
144	13	}
145	8	return root;
146	8	}
147
148		rapidjson::Value* JsonFunctions::get_json_array_from_parsed_json(
149		const std::string& json_path, rapidjson::Value* document,
150	9	rapidjson::Document::AllocatorType& mem_allocator, bool* wrap_explicitly) {
151	9	std::vector<JsonPath> vec;
152	9	parse_json_paths(json_path, &vec);
153	9	return get_json_array_from_parsed_json(vec, document, mem_allocator, wrap_explicitly);
154	9	}
155
156		rapidjson::Value* JsonFunctions::get_json_array_from_parsed_json(
157		const std::vector<JsonPath>& parsed_paths, rapidjson::Value* document,
158	9	rapidjson::Document::AllocatorType& mem_allocator, bool* wrap_explicitly) {
159	9	*wrap_explicitly = false;
160	9	if (!parsed_paths[0].is_valid) {
161	0	return nullptr;
162	0	}
163
164	9	if (parsed_paths.size() == 1) {
165		// the json path is "$", just return entire document
166		// wrapper an array
167	1	rapidjson::Value* array_obj = nullptr;
168	1	array_obj = static_cast<rapidjson::Value*>(mem_allocator.Malloc(sizeof(rapidjson::Value)));
169	1	array_obj->SetArray();
170	1	array_obj->PushBack(*document, mem_allocator);
171	1	return array_obj;
172	1	}
173
174	8	rapidjson::Value* root = match_value(parsed_paths, document, mem_allocator, true);
175	8	if (root == nullptr \|\| root == document) { // not found
176	0	return nullptr;
177	8	} else if (!root->IsArray() && wrap_explicitly) {
178	1	rapidjson::Value* array_obj = nullptr;
179	1	array_obj = static_cast<rapidjson::Value*>(mem_allocator.Malloc(sizeof(rapidjson::Value)));
180	1	array_obj->SetArray();
181	1	rapidjson::Value copy;
182	1	copy.CopyFrom(*root, mem_allocator);
183	1	array_obj->PushBack(std::move(copy), mem_allocator);
184		// set `wrap_explicitly` to true, so that the caller knows that this Array is wrapped actively.
185	1	*wrap_explicitly = true;
186	1	return array_obj;
187	1	}
188	7	return root;
189	8	}
190
191		rapidjson::Value* JsonFunctions::get_json_object_from_parsed_json(
192		const std::vector<JsonPath>& parsed_paths, rapidjson::Value* document,
193	0	rapidjson::Document::AllocatorType& mem_allocator) {
194	0	if (!parsed_paths[0].is_valid) {
195	0	return nullptr;
196	0	}
197
198	0	if (parsed_paths.size() == 1) {
199		// the json path is "$", just return entire document
200	0	return document;
201	0	}
202
203	0	rapidjson::Value* root = match_value(parsed_paths, document, mem_allocator, true);
204	0	if (root == nullptr \|\| root == document) { // not found
205	0	return nullptr;
206	0	}
207	0	return root;
208	0	}
209
210		void JsonFunctions::parse_json_paths(const std::string& path_string,
211	9	std::vector<JsonPath>* parsed_paths) {
212		// split path by ".", and escape quota by "\"
213		// eg:
214		// '$.text#abc.xyz' -> [$, text#abc, xyz]
215		// '$."text.abc".xyz' -> [$, text.abc, xyz]
216		// '$."text.abc"[1].xyz' -> [$, text.abc[1], xyz]
217	9	try {
218	9	boost::tokenizer<boost::escaped_list_separator<char>> tok(
219	9	path_string, boost::escaped_list_separator<char>("\\", ".", "\""));
220	9	std::vector<std::string> paths(tok.begin(), tok.end());
221	9	get_parsed_paths(paths, parsed_paths);
222	9	} catch (const boost::escaped_list_error& err) {
223	0	throw doris::Exception(ErrorCode::INVALID_JSON_PATH, "meet error {}", err.what());
224	0	}
225	9	}
226
227		void JsonFunctions::get_parsed_paths(const std::vector<std::string>& path_exprs,
228	9	std::vector<JsonPath>* parsed_paths) {
229	9	if (path_exprs.empty()) {
230	0	return;
231	0	}
232
233	9	if (path_exprs[0] != "$") {
234	0	parsed_paths->emplace_back("", -1, false);
235	9	} else {
236	9	parsed_paths->emplace_back("$", -1, true);
237	9	}
238
239	22	for (int i = 1; i < path_exprs.size(); i++) {
240	13	std::string col;
241	13	std::string index;
242	13	if (UNLIKELY(!RE2::FullMatch(path_exprs[i], JSON_PATTERN, &col, &index))) {
243	0	parsed_paths->emplace_back("", -1, false);
244	13	} else {
245	13	int idx = -1;
246	13	if (!index.empty()) {
247	4	if (index == "*") {
248	4	idx = -2;
249	4	} else {
250	0	idx = atoi(index.c_str());
251	0	}
252	4	}
253	13	parsed_paths->emplace_back(std::move(col), idx, true);
254	13	}
255	13	}
256	9	}
257
258		Status JsonFunctions::extract_from_object(simdjson::ondemand::object& obj,
259		const std::vector<JsonPath>& jsonpath,
260	0	simdjson::ondemand::value* value) noexcept {
261		// Return DataQualityError when it's a malformed json.
262		// Otherwise the path was not found, due to
263		// 1. array out of bound
264		// 2. not exist such field in object
265		// 3. the input type is not object but could be null or other types and lead to simdjson::INCORRECT_TYPE
266	0	#define HANDLE_SIMDJSON_ERROR(err, msg) \
267	0	do { \
268	0	const simdjson::error_code& _err = err; \
269	0	const std::string& _msg = msg; \
270	0	if (UNLIKELY(_err)) { \
271	0	if (_err == simdjson::NO_SUCH_FIELD \|\| _err == simdjson::INDEX_OUT_OF_BOUNDS \|\| \
272	0	_err == simdjson::INCORRECT_TYPE) { \
273	0	return Status::NotFound<false>( \
274	0	fmt::format("Not found target filed, err: {}, msg: {}", \
275	0	simdjson::error_message(_err), _msg)); \
276	0	} \
277	0	return Status::DataQualityError( \
278	0	fmt::format("err: {}, msg: {}", simdjson::error_message(_err), _msg)); \
279	0	} \
280	0	} while (false);
281
282	0	if (jsonpath.size() <= 1) {
283		// The first elem of json path should be '$'.
284		// A valid json path's size is >= 2.
285	0	return Status::DataQualityError("empty json path");
286	0	}
287
288	0	simdjson::ondemand::value tvalue;
289
290		// Skip the first $.
291	0	for (int i = 1; i < jsonpath.size(); i++) {
292	0	if (UNLIKELY(!jsonpath[i].is_valid)) {
293	0	return Status::DataQualityError(fmt::format("invalid json path: {}", jsonpath[i].key));
294	0	}
295
296	0	const std::string& col = jsonpath[i].key;
297	0	int index = jsonpath[i].idx;
298
299		// Since the simdjson::ondemand::object cannot be converted to simdjson::ondemand::value,
300		// we have to do some special treatment for the second elem of json path.
301		// If the key is not found in json object, simdjson::NO_SUCH_FIELD would be returned.
302	0	if (i == 1) {
303	0	HANDLE_SIMDJSON_ERROR(obj.find_field_unordered(col).get(tvalue),
304	0	fmt::format("unable to find field: {}", col));
305	0	} else {
306	0	HANDLE_SIMDJSON_ERROR(tvalue.find_field_unordered(col).get(tvalue),
307	0	fmt::format("unable to find field: {}", col));
308	0	}
309
310		// TODO support [*] which idex == -2
311	0	if (index != -1) {
312		// try to access tvalue as array.
313		// If the index is beyond the length of array, simdjson::INDEX_OUT_OF_BOUNDS would be returned.
314	0	simdjson::ondemand::array arr;
315	0	HANDLE_SIMDJSON_ERROR(tvalue.get_array().get(arr),
316	0	fmt::format("failed to access field as array, field: {}", col));
317
318	0	HANDLE_SIMDJSON_ERROR(
319	0	arr.at(index).get(tvalue),
320	0	fmt::format("failed to access array field: {}, index: {}", col, index));
321	0	}
322	0	}
323
324	0	std::swap(*value, tvalue);
325
326	0	return Status::OK();
327	0	}
328
329		} // namespace doris