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[Enhancement] Support the conversion from json to struct
Signed-off-by: Song Jiacheng <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // Copyright 2021-present StarRocks, Inc. All rights reserved. | ||
| // | ||
| // Licensed 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 | ||
| // | ||
| // https://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 "column/array_column.h" | ||
| #include "column/column_builder.h" | ||
| #include "column/column_helper.h" | ||
| #include "column/column_viewer.h" | ||
| #include "column/json_column.h" | ||
| #include "exprs/cast_expr.h" | ||
| #include "exprs/expr_context.h" | ||
| #include "gutil/casts.h" | ||
| #include "gutil/strings/split.h" | ||
| #include "gutil/strings/strip.h" | ||
| #include "gutil/strings/substitute.h" | ||
| #include "jsonpath.h" | ||
| #include "runtime/memory/memory_resource.h" | ||
| #include "types/logical_type.h" | ||
| #include "util/slice.h" | ||
| #include "velocypack/Iterator.h" | ||
|
|
||
| namespace starrocks { | ||
|
|
||
| #define APPEND_NULL(json_columns, null_column) \ | ||
| for (auto& json_column : json_columns) { \ | ||
| json_column.append_null(); \ | ||
| } \ | ||
| null_column->append(1); | ||
|
|
||
| StatusOr<ColumnPtr> CastJsonToStruct::evaluate_checked(ExprContext* context, Chunk* input_chunk) { | ||
| ASSIGN_OR_RETURN(ColumnPtr column, _children[0]->evaluate_checked(context, input_chunk)); | ||
| if (column->only_null()) { | ||
| return ColumnHelper::create_const_null_column(column->size()); | ||
| } | ||
|
|
||
| ColumnViewer<TYPE_JSON> src(column); | ||
| NullColumn::Ptr null_column = NullColumn::create(); | ||
|
|
||
| // 1. Cast Json to json columns. | ||
| size_t field_size = _type.children.size(); | ||
| DCHECK_EQ(field_size, _type.field_names.size()); | ||
| vector<ColumnBuilder<TYPE_JSON>> json_columns; | ||
| for (size_t i = 0; i < field_size; i++) { | ||
| ColumnBuilder<TYPE_JSON> json_column_builder(src.size()); | ||
| json_columns.emplace_back(json_column_builder); | ||
| } | ||
| for (size_t i = 0; i < src.size(); i++) { | ||
| if (src.is_null(i)) { | ||
| APPEND_NULL(json_columns, null_column); | ||
| continue; | ||
| } | ||
| const JsonValue* json_value = src.value(i); | ||
| if (json_value && json_value->get_type() == JsonType::JSON_ARRAY) { | ||
| vpack::Slice json_slice = json_value->to_vslice(); | ||
| DCHECK(json_slice.isArray()); | ||
| size_t index = 0; | ||
| for (const auto& element : vpack::ArrayIterator(json_slice)) { | ||
| if (index >= field_size) { | ||
| break; | ||
| } | ||
| JsonValue element_value(element); | ||
| json_columns[index].append(std::move(element_value)); | ||
| index++; | ||
| } | ||
| if (index < field_size) { | ||
| // Fill the other field with null. | ||
| for (; index < field_size; index++) { | ||
| json_columns[index].append_null(); | ||
| } | ||
| } | ||
| null_column->append(0); | ||
| } else if (json_value && json_value->get_type() == JsonType::JSON_OBJECT) { | ||
| // For json object, the names of the struct fields must match the json object keys. | ||
| // Otherwise, the value of the field will be NULL. | ||
| for (int path_index = 0; path_index < _type.field_names.size(); path_index++) { | ||
| vpack::Builder builder; | ||
| if (path_index >= _json_paths.size()) { | ||
| json_columns[path_index].append_null(); | ||
| continue; | ||
| } | ||
| vpack::Slice json_slice = JsonPath::extract(json_value, _json_paths[path_index], &builder); | ||
| if (json_slice.isNone()) { | ||
| json_columns[path_index].append_null(); | ||
| continue; | ||
| } | ||
| JsonValue element_value(json_slice); | ||
| json_columns[path_index].append(std::move(element_value)); | ||
| } | ||
| null_column->append(0); | ||
| } else { | ||
| APPEND_NULL(json_columns, null_column); | ||
| } | ||
| } | ||
| // 2. Cast json column to specified column | ||
| Columns casted_fields; | ||
| for (size_t i = 0; i < field_size; i++) { | ||
| ColumnPtr elements = json_columns[i].build_nullable_column(); | ||
| if (_field_casts[i] != nullptr) { | ||
| Chunk field_chunk; | ||
| field_chunk.append_column(elements, 0); | ||
| ASSIGN_OR_RETURN(auto casted_field, _field_casts[i]->evaluate_checked(context, &field_chunk)); | ||
| casted_field = NullableColumn::wrap_if_necessary(casted_field); | ||
| casted_fields.emplace_back(std::move(casted_field)); | ||
| } else { | ||
| casted_fields.emplace_back(NullableColumn::wrap_if_necessary(elements->clone_shared())); | ||
| } | ||
| DCHECK(casted_fields[i]->is_nullable()); | ||
| } | ||
|
|
||
| ColumnPtr res = StructColumn::create(std::move(casted_fields), _type.field_names); | ||
| RETURN_IF_ERROR(res->unfold_const_children(_type)); | ||
| if (column->is_nullable()) { | ||
| res = NullableColumn::create(res, null_column); | ||
| } | ||
|
|
||
| // Wrap constant column if source column is constant. | ||
| if (column->is_constant()) { | ||
| res = ConstColumn::create(res, column->size()); | ||
| } | ||
| return res; | ||
| } | ||
|
|
||
| } // namespace starrocks |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| -- name: test_cast_json_to_struct | ||
| select cast(PARSE_JSON('[1,2,3]') as struct<col1 int, col2 int, col3 int>); | ||
| -- result: | ||
| {"col1":1,"col2":2,"col3":3} | ||
| -- !result | ||
| select cast(PARSE_JSON('[1,2,3]') as struct<col1 int, col2 int>); | ||
| -- result: | ||
| {"col1":1,"col2":2} | ||
| -- !result | ||
| select cast(PARSE_JSON('[1,2,3]') as struct<col1 int, col2 int, col3 int, col4 int>); | ||
| -- result: | ||
| {"col1":1,"col2":2,"col3":3,"col4":null} | ||
| -- !result | ||
| select cast(PARSE_JSON('[1, 2, 3, "a"]') as struct<col1 int, col2 int, col3 int, col4 int>); | ||
| -- result: | ||
| {"col1":1,"col2":2,"col3":3,"col4":null} | ||
| -- !result | ||
| select cast(PARSE_JSON('[1.1, 2.2, 3.3]') as struct<col1 double, col2 double, col3 double>); | ||
| -- result: | ||
| {"col1":1.1,"col2":2.2,"col3":3.3} | ||
| -- !result | ||
| select cast(PARSE_JSON('[1.1, 2.2, 3.3]') as struct<col1 double, col2 double, col3 int>); | ||
| -- result: | ||
| {"col1":1.1,"col2":2.2,"col3":3} | ||
| -- !result | ||
| select cast(PARSE_JSON('{"star": "rocks", "number": 1}') as struct<number int, star varchar>); | ||
| -- result: | ||
| {"number":1,"star":"rocks"} | ||
| -- !result | ||
| select cast(PARSE_JSON('{"star": "rocks", "number": 1}') as struct<number int, not_found varchar>); | ||
| -- result: | ||
| {"number":1,"not_found":null} | ||
| -- !result | ||
| select cast(PARSE_JSON('{"star": "rocks", "number": [1, 2, 3]}') as struct<number array<int>, not_found varchar>); | ||
| -- result: | ||
| {"number":[1,2,3],"not_found":null} | ||
| -- !result | ||
| select cast(PARSE_JSON('[1, [{"star": "rocks"}, {"star": "rocks"}]]') as struct<col1 int, col2 array<json>>); | ||
| -- result: | ||
| {"col1":1,"col2":['{"star": "rocks"}','{"star": "rocks"}']} | ||
| -- !result | ||
| select cast(PARSE_JSON('{"star" : "rocks", "length": 5, "numbers": [1, 4, 7], "nest": [1, 2, 3]}') as struct<star varchar(10), length int, numbers array<int>, nest struct<col1 int, col2 int, col3 int>>); | ||
| -- result: | ||
| {"star":"rocks","length":5,"numbers":[1,4,7],"nest":{"col1":1,"col2":2,"col3":3}} | ||
| -- !result | ||
| select cast(PARSE_JSON('[{"star" : "rocks", "length": 5, "numbers": [1, 4, 7], "nest": [1, 2, 3]}, {"star" : "rockses", "length": 33, "numbers": [2, 5, 9], "nest": [3, 6, 9]}]') as array<struct<star varchar(10), length int, numbers array<int>, nest struct<col1 int, col2 int, col3 int>>>); | ||
| -- result: | ||
| [{"star":"rocks","length":5,"numbers":[1,4,7],"nest":{"col1":1,"col2":2,"col3":3}},{"star":"rockses","length":33,"numbers":[2,5,9],"nest":{"col1":3,"col2":6,"col3":9}}] | ||
| -- !result |
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