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

Source (jump to first uncovered line)
// 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 <rapidjson/stringbuffer.h>
#include <rapidjson/writer.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>

#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();
}

std::string JsonFunctions::print_json_value(const rapidjson::Value& value) {
    rapidjson::StringBuffer buffer;
    buffer.Clear();
    rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
    value.Accept(writer);
    return std::string(buffer.GetString());
}

void JsonFunctions::merge_objects(rapidjson::Value& dst_object, rapidjson::Value& src_object,
                                  rapidjson::Document::AllocatorType& allocator) {
    if (!src_object.IsObject()) {
        return;
    }
    VLOG_DEBUG << "merge from src: " << print_json_value(src_object)
               << ", to: " << print_json_value(dst_object);
    for (auto src_it = src_object.MemberBegin(); src_it != src_object.MemberEnd(); ++src_it) {
        auto dst_it = dst_object.FindMember(src_it->name);
        if (dst_it != dst_object.MemberEnd()) {
            if (src_it->value.IsObject() && dst_it->value.IsObject()) {
                merge_objects(dst_it->value, src_it->value, allocator);
            } else {
                if (dst_it->value.IsNull()) {
                    dst_it->value = src_it->value;
                }
            }
        } else {
            dst_object.AddMember(src_it->name, src_it->value, allocator);
        }
    }
}

// root path "$."
bool JsonFunctions::is_root_path(const std::vector<JsonPath>& json_path) {
    return json_path.size() == 2 && json_path[0].key == "$" && json_path[1].key.empty();
}

} // namespace doris

Coverage Report

Created: 2024-11-21 17:33

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 <rapidjson/stringbuffer.h>
25		#include <rapidjson/writer.h>
26		#include <re2/re2.h>
27		#include <simdjson/error.h>
28		#include <simdjson/simdjson.h> // IWYU pragma: keep
29		#include <stdlib.h>
30
31		#include <boost/iterator/iterator_facade.hpp>
32		#include <boost/token_functions.hpp>
33		#include <boost/tokenizer.hpp>
34		#include <sstream>
35		#include <string>
36		#include <vector>
37
38		#include "common/compiler_util.h" // IWYU pragma: keep
39		#include "common/exception.h"
40		#include "common/logging.h"
41
42		namespace doris {
43
44		// static const re2::RE2 JSON_PATTERN("^([a-zA-Z0-9_\\-\\:\\s#\\\|\\.]*)(?:\\[([0-9]+)\\])?");
45		// json path cannot contains: ", [, ]
46		static const re2::RE2 JSON_PATTERN("^([^\\\"\\[\\]])(?:\\[([0-9]+\|\\)\\])?");
47
48		rapidjson::Value* JsonFunctions::match_value(const std::vector<JsonPath>& parsed_paths,
49		rapidjson::Value* document,
50		rapidjson::Document::AllocatorType& mem_allocator,
51	8	bool is_insert_null) {
52	8	rapidjson::Value* root = document;
53	8	rapidjson::Value* array_obj = nullptr;
54	21	for (int i = 1; i < parsed_paths.size(); i++) {
55	13	VLOG_TRACE << "parsed_paths: " << parsed_paths[i].debug_string();
56
57	13	if (root == nullptr \|\| root->IsNull()) {
58	0	return nullptr;
59	0	}
60
61	13	if (UNLIKELY(!parsed_paths[i].is_valid)) {
62	0	return nullptr;
63	0	}
64
65	13	const std::string& col = parsed_paths[i].key;
66	13	int index = parsed_paths[i].idx;
67	13	if (LIKELY(!col.empty())) {
68	9	if (root->IsArray()) {
69	5	array_obj = static_cast<rapidjson::Value*>(
70	5	mem_allocator.Malloc(sizeof(rapidjson::Value)));
71	5	array_obj->SetArray();
72	5	bool is_null = true;
73
74		// if array ,loop the array,find out all Objects,then find the results from the objects
75	16	for (int j = 0; j < root->Size(); j++) {
76	11	rapidjson::Value* json_elem = &((*root)[j]);
77
78	11	if (json_elem->IsArray() \|\| json_elem->IsNull()) {
79	0	continue;
80	11	} else {
81	11	if (!json_elem->IsObject()) {
82	0	continue;
83	0	}
84	11	if (!json_elem->HasMember(col.c_str())) {
85	1	if (is_insert_null) { // not found item, then insert a null object.
86	1	is_null = false;
87	1	rapidjson::Value nullObject(rapidjson::kNullType);
88	1	array_obj->PushBack(nullObject, mem_allocator);
89	1	}
90	1	continue;
91	1	}
92	10	rapidjson::Value* obj = &((*json_elem)[col.c_str()]);
93	10	if (obj->IsArray()) {
94	0	is_null = false;
95	0	for (int k = 0; k < obj->Size(); k++) {
96	0	array_obj->PushBack((*obj)[k], mem_allocator);
97	0	}
98	10	} else if (!obj->IsNull()) {
99	10	is_null = false;
100	10	array_obj->PushBack(*obj, mem_allocator);
101	10	}
102	10	}
103	11	}
104
105	5	root = is_null ? &(array_obj->SetNull()) : array_obj;
106	5	} else if (root->IsObject()) {
107	4	if (!root->HasMember(col.c_str())) {
108	0	return nullptr;
109	4	} else {
110	4	root = &((*root)[col.c_str()]);
111	4	}
112	4	} else {
113		// root is not a nested type, return nullptr
114	0	return nullptr;
115	0	}
116	9	}
117
118	13	if (UNLIKELY(index != -1)) {
119		// judge the rapidjson:Value, which base the top's result,
120		// if not array return nullptr;else get the index value from the array
121	4	if (root->IsArray()) {
122	4	if (root->IsNull()) {
123	0	return nullptr;
124	4	} else if (index == -2) {
125		// [*]
126	4	array_obj = static_cast<rapidjson::Value*>(
127	4	mem_allocator.Malloc(sizeof(rapidjson::Value)));
128	4	array_obj->SetArray();
129
130	13	for (int j = 0; j < root->Size(); j++) {
131	9	rapidjson::Value v;
132	9	v.CopyFrom((*root)[j], mem_allocator);
133	9	array_obj->PushBack(v, mem_allocator);
134	9	}
135	4	root = array_obj;
136	4	} else if (index >= root->Size()) {
137	0	return nullptr;
138	0	} else {
139	0	root = &((*root)[index]);
140	0	}
141	4	} else {
142	0	return nullptr;
143	0	}
144	4	}
145	13	}
146	8	return root;
147	8	}
148
149		rapidjson::Value* JsonFunctions::get_json_array_from_parsed_json(
150		const std::string& json_path, rapidjson::Value* document,
151	9	rapidjson::Document::AllocatorType& mem_allocator, bool* wrap_explicitly) {
152	9	std::vector<JsonPath> vec;
153	9	parse_json_paths(json_path, &vec);
154	9	return get_json_array_from_parsed_json(vec, document, mem_allocator, wrap_explicitly);
155	9	}
156
157		rapidjson::Value* JsonFunctions::get_json_array_from_parsed_json(
158		const std::vector<JsonPath>& parsed_paths, rapidjson::Value* document,
159	9	rapidjson::Document::AllocatorType& mem_allocator, bool* wrap_explicitly) {
160	9	*wrap_explicitly = false;
161	9	if (!parsed_paths[0].is_valid) {
162	0	return nullptr;
163	0	}
164
165	9	if (parsed_paths.size() == 1) {
166		// the json path is "$", just return entire document
167		// wrapper an array
168	1	rapidjson::Value* array_obj = nullptr;
169	1	array_obj = static_cast<rapidjson::Value*>(mem_allocator.Malloc(sizeof(rapidjson::Value)));
170	1	array_obj->SetArray();
171	1	array_obj->PushBack(*document, mem_allocator);
172	1	return array_obj;
173	1	}
174
175	8	rapidjson::Value* root = match_value(parsed_paths, document, mem_allocator, true);
176	8	if (root == nullptr \|\| root == document) { // not found
177	0	return nullptr;
178	8	} else if (!root->IsArray() && wrap_explicitly) {
179	1	rapidjson::Value* array_obj = nullptr;
180	1	array_obj = static_cast<rapidjson::Value*>(mem_allocator.Malloc(sizeof(rapidjson::Value)));
181	1	array_obj->SetArray();
182	1	rapidjson::Value copy;
183	1	copy.CopyFrom(*root, mem_allocator);
184	1	array_obj->PushBack(std::move(copy), mem_allocator);
185		// set `wrap_explicitly` to true, so that the caller knows that this Array is wrapped actively.
186	1	*wrap_explicitly = true;
187	1	return array_obj;
188	1	}
189	7	return root;
190	8	}
191
192		rapidjson::Value* JsonFunctions::get_json_object_from_parsed_json(
193		const std::vector<JsonPath>& parsed_paths, rapidjson::Value* document,
194	0	rapidjson::Document::AllocatorType& mem_allocator) {
195	0	if (!parsed_paths[0].is_valid) {
196	0	return nullptr;
197	0	}
198
199	0	if (parsed_paths.size() == 1) {
200		// the json path is "$", just return entire document
201	0	return document;
202	0	}
203
204	0	rapidjson::Value* root = match_value(parsed_paths, document, mem_allocator, true);
205	0	if (root == nullptr \|\| root == document) { // not found
206	0	return nullptr;
207	0	}
208	0	return root;
209	0	}
210
211		void JsonFunctions::parse_json_paths(const std::string& path_string,
212	9	std::vector<JsonPath>* parsed_paths) {
213		// split path by ".", and escape quota by "\"
214		// eg:
215		// '$.text#abc.xyz' -> [$, text#abc, xyz]
216		// '$."text.abc".xyz' -> [$, text.abc, xyz]
217		// '$."text.abc"[1].xyz' -> [$, text.abc[1], xyz]
218	9	try {
219	9	boost::tokenizer<boost::escaped_list_separator<char>> tok(
220	9	path_string, boost::escaped_list_separator<char>("\\", ".", "\""));
221	9	std::vector<std::string> paths(tok.begin(), tok.end());
222	9	get_parsed_paths(paths, parsed_paths);
223	9	} catch (const boost::escaped_list_error& err) {
224	0	throw doris::Exception(ErrorCode::INVALID_JSON_PATH, "meet error {}", err.what());
225	0	}
226	9	}
227
228		void JsonFunctions::get_parsed_paths(const std::vector<std::string>& path_exprs,
229	9	std::vector<JsonPath>* parsed_paths) {
230	9	if (path_exprs.empty()) {
231	0	return;
232	0	}
233
234	9	if (path_exprs[0] != "$") {
235	0	parsed_paths->emplace_back("", -1, false);
236	9	} else {
237	9	parsed_paths->emplace_back("$", -1, true);
238	9	}
239
240	22	for (int i = 1; i < path_exprs.size(); i++) {
241	13	std::string col;
242	13	std::string index;
243	13	if (UNLIKELY(!RE2::FullMatch(path_exprs[i], JSON_PATTERN, &col, &index))) {
244	0	parsed_paths->emplace_back("", -1, false);
245	13	} else {
246	13	int idx = -1;
247	13	if (!index.empty()) {
248	4	if (index == "*") {
249	4	idx = -2;
250	4	} else {
251	0	idx = atoi(index.c_str());
252	0	}
253	4	}
254	13	parsed_paths->emplace_back(std::move(col), idx, true);
255	13	}
256	13	}
257	9	}
258
259		Status JsonFunctions::extract_from_object(simdjson::ondemand::object& obj,
260		const std::vector<JsonPath>& jsonpath,
261	0	simdjson::ondemand::value* value) noexcept {
262		// Return DataQualityError when it's a malformed json.
263		// Otherwise the path was not found, due to
264		// 1. array out of bound
265		// 2. not exist such field in object
266		// 3. the input type is not object but could be null or other types and lead to simdjson::INCORRECT_TYPE
267	0	#define HANDLE_SIMDJSON_ERROR(err, msg) \
268	0	do { \
269	0	const simdjson::error_code& _err = err; \
270	0	const std::string& _msg = msg; \
271	0	if (UNLIKELY(_err)) { \
272	0	if (_err == simdjson::NO_SUCH_FIELD \|\| _err == simdjson::INDEX_OUT_OF_BOUNDS \|\| \
273	0	_err == simdjson::INCORRECT_TYPE) { \
274	0	return Status::NotFound<false>( \
275	0	fmt::format("Not found target filed, err: {}, msg: {}", \
276	0	simdjson::error_message(_err), _msg)); \
277	0	} \
278	0	return Status::DataQualityError( \
279	0	fmt::format("err: {}, msg: {}", simdjson::error_message(_err), _msg)); \
280	0	} \
281	0	} while (false);
282
283	0	if (jsonpath.size() <= 1) {
284		// The first elem of json path should be '$'.
285		// A valid json path's size is >= 2.
286	0	return Status::DataQualityError("empty json path");
287	0	}
288
289	0	simdjson::ondemand::value tvalue;
290
291		// Skip the first $.
292	0	for (int i = 1; i < jsonpath.size(); i++) {
293	0	if (UNLIKELY(!jsonpath[i].is_valid)) {
294	0	return Status::DataQualityError(fmt::format("invalid json path: {}", jsonpath[i].key));
295	0	}
296
297	0	const std::string& col = jsonpath[i].key;
298	0	int index = jsonpath[i].idx;
299
300		// Since the simdjson::ondemand::object cannot be converted to simdjson::ondemand::value,
301		// we have to do some special treatment for the second elem of json path.
302		// If the key is not found in json object, simdjson::NO_SUCH_FIELD would be returned.
303	0	if (i == 1) {
304	0	HANDLE_SIMDJSON_ERROR(obj.find_field_unordered(col).get(tvalue),
305	0	fmt::format("unable to find field: {}", col));
306	0	} else {
307	0	HANDLE_SIMDJSON_ERROR(tvalue.find_field_unordered(col).get(tvalue),
308	0	fmt::format("unable to find field: {}", col));
309	0	}
310
311		// TODO support [*] which idex == -2
312	0	if (index != -1) {
313		// try to access tvalue as array.
314		// If the index is beyond the length of array, simdjson::INDEX_OUT_OF_BOUNDS would be returned.
315	0	simdjson::ondemand::array arr;
316	0	HANDLE_SIMDJSON_ERROR(tvalue.get_array().get(arr),
317	0	fmt::format("failed to access field as array, field: {}", col));
318
319	0	HANDLE_SIMDJSON_ERROR(
320	0	arr.at(index).get(tvalue),
321	0	fmt::format("failed to access array field: {}, index: {}", col, index));
322	0	}
323	0	}
324
325	0	std::swap(*value, tvalue);
326
327	0	return Status::OK();
328	0	}
329
330	0	std::string JsonFunctions::print_json_value(const rapidjson::Value& value) {
331	0	rapidjson::StringBuffer buffer;
332	0	buffer.Clear();
333	0	rapidjson::Writer<rapidjson::StringBuffer> writer(buffer);
334	0	value.Accept(writer);
335	0	return std::string(buffer.GetString());
336	0	}
337
338		void JsonFunctions::merge_objects(rapidjson::Value& dst_object, rapidjson::Value& src_object,
339	0	rapidjson::Document::AllocatorType& allocator) {
340	0	if (!src_object.IsObject()) {
341	0	return;
342	0	}
343	0	VLOG_DEBUG << "merge from src: " << print_json_value(src_object)
344	0	<< ", to: " << print_json_value(dst_object);
345	0	for (auto src_it = src_object.MemberBegin(); src_it != src_object.MemberEnd(); ++src_it) {
346	0	auto dst_it = dst_object.FindMember(src_it->name);
347	0	if (dst_it != dst_object.MemberEnd()) {
348	0	if (src_it->value.IsObject() && dst_it->value.IsObject()) {
349	0	merge_objects(dst_it->value, src_it->value, allocator);
350	0	} else {
351	0	if (dst_it->value.IsNull()) {
352	0	dst_it->value = src_it->value;
353	0	}
354	0	}
355	0	} else {
356	0	dst_object.AddMember(src_it->name, src_it->value, allocator);
357	0	}
358	0	}
359	0	}
360
361		// root path "$."
362	0	bool JsonFunctions::is_root_path(const std::vector<JsonPath>& json_path) {
363	0	return json_path.size() == 2 && json_path[0].key == "$" && json_path[1].key.empty();
364	0	}
365
366		} // namespace doris