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[feature](json)support explode_json_object func (#36887)
after this pr we support expand json object into two column with key column (string) ,and value column(json value)
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be/src/vec/exprs/table_function/vexplode_json_object.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. | ||
|
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| #include "vec/exprs/table_function/vexplode_json_object.h" | ||
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| #include <glog/logging.h> | ||
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| #include <ostream> | ||
| #include <vector> | ||
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| #include "common/status.h" | ||
| #include "vec/columns/column.h" | ||
| #include "vec/common/string_ref.h" | ||
| #include "vec/core/block.h" | ||
| #include "vec/core/column_with_type_and_name.h" | ||
| #include "vec/exprs/vexpr.h" | ||
| #include "vec/exprs/vexpr_context.h" | ||
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| namespace doris::vectorized { | ||
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| VExplodeJsonObjectTableFunction::VExplodeJsonObjectTableFunction() { | ||
| _fn_name = "vexplode_json_object"; | ||
| } | ||
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| Status VExplodeJsonObjectTableFunction::process_init(Block* block, RuntimeState* state) { | ||
| CHECK(_expr_context->root()->children().size() == 1) | ||
| << "VExplodeJsonObjectTableFunction only support 1 child but has " | ||
| << _expr_context->root()->children().size(); | ||
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| int text_column_idx = -1; | ||
| RETURN_IF_ERROR(_expr_context->root()->children()[0]->execute(_expr_context.get(), block, | ||
| &text_column_idx)); | ||
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| _json_object_column = block->get_by_position(text_column_idx).column; | ||
| return Status::OK(); | ||
| } | ||
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| void VExplodeJsonObjectTableFunction::process_row(size_t row_idx) { | ||
| TableFunction::process_row(row_idx); | ||
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| StringRef text = _json_object_column->get_data_at(row_idx); | ||
| if (text.data != nullptr) { | ||
| JsonbDocument* doc = JsonbDocument::createDocument(text.data, text.size); | ||
| if (UNLIKELY(!doc || !doc->getValue())) { | ||
| // error jsonb, put null into output, cur_size = 0 , we will insert_default | ||
| return; | ||
| } | ||
| // value is NOT necessary to be deleted since JsonbValue will not allocate memory | ||
| JsonbValue* value = doc->getValue(); | ||
| auto writer = std::make_unique<JsonbWriter>(); | ||
| if (value->isObject()) { | ||
| _cur_size = value->length(); | ||
| ObjectVal* obj = (ObjectVal*)value; | ||
| _object_pairs.first = | ||
| ColumnNullable::create(ColumnString::create(), ColumnUInt8::create()); | ||
| _object_pairs.second = | ||
| ColumnNullable::create(ColumnString::create(), ColumnUInt8::create()); | ||
| _object_pairs.first->reserve(_cur_size); | ||
| _object_pairs.second->reserve(_cur_size); | ||
| for (auto it = obj->begin(); it != obj->end(); ++it) { | ||
| _object_pairs.first->insert_data(it->getKeyStr(), it->klen()); | ||
| writer->reset(); | ||
| writer->writeValue(it->value()); | ||
| if (it->value()->isNull()) { | ||
| _object_pairs.second->insert_default(); | ||
| } else { | ||
| const std::string_view& jsonb_value = std::string_view( | ||
| writer->getOutput()->getBuffer(), writer->getOutput()->getSize()); | ||
| _object_pairs.second->insert_data(jsonb_value.data(), jsonb_value.size()); | ||
| } | ||
| } | ||
| } | ||
| // we do not support other json type except object | ||
| } | ||
| } | ||
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| void VExplodeJsonObjectTableFunction::process_close() { | ||
| _json_object_column = nullptr; | ||
| _object_pairs.first = nullptr; | ||
| _object_pairs.second = nullptr; | ||
| } | ||
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| void VExplodeJsonObjectTableFunction::get_same_many_values(MutableColumnPtr& column, int length) { | ||
| // if current is empty map row, also append a default value | ||
| if (current_empty()) { | ||
| column->insert_many_defaults(length); | ||
| return; | ||
| } | ||
| ColumnStruct* ret = nullptr; | ||
| // this _is_nullable is whole output column's nullable | ||
| if (_is_nullable) { | ||
| // make map kv value into struct | ||
| ret = assert_cast<ColumnStruct*>( | ||
| assert_cast<ColumnNullable*>(column.get())->get_nested_column_ptr().get()); | ||
| assert_cast<ColumnUInt8*>( | ||
| assert_cast<ColumnNullable*>(column.get())->get_null_map_column_ptr().get()) | ||
| ->insert_many_defaults(length); | ||
| } else if (column->is_column_struct()) { | ||
| ret = assert_cast<ColumnStruct*>(column.get()); | ||
| } else { | ||
| throw Exception(ErrorCode::INTERNAL_ERROR, | ||
| "only support expand json object int to struct(kv pair), but given: ", | ||
| column->get_name()); | ||
| } | ||
| if (!ret || ret->tuple_size() != 2) { | ||
| throw Exception(ErrorCode::INTERNAL_ERROR, | ||
| "only support expand json object int to kv pair column, but given: ", | ||
| ret->tuple_size()); | ||
| } | ||
| ret->get_column(0).insert_many_from(*_object_pairs.first, _cur_offset, length); | ||
| ret->get_column(1).insert_many_from(*_object_pairs.second, _cur_offset, length); | ||
| } | ||
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| int VExplodeJsonObjectTableFunction::get_value(MutableColumnPtr& column, int max_step) { | ||
| max_step = std::min(max_step, (int)(_cur_size - _cur_offset)); | ||
| if (current_empty()) { | ||
| column->insert_default(); | ||
| max_step = 1; | ||
| } else { | ||
| ColumnStruct* struct_column = nullptr; | ||
| if (_is_nullable) { | ||
| auto* nullable_column = assert_cast<ColumnNullable*>(column.get()); | ||
| struct_column = | ||
| assert_cast<ColumnStruct*>(nullable_column->get_nested_column_ptr().get()); | ||
| auto* nullmap_column = | ||
| assert_cast<ColumnUInt8*>(nullable_column->get_null_map_column_ptr().get()); | ||
| // here nullmap_column insert max_step many defaults as if MAP[row_idx] is NULL | ||
| // will be not update value, _cur_size = 0, means current_empty; | ||
| // so here could insert directly | ||
| nullmap_column->insert_many_defaults(max_step); | ||
| } else { | ||
| struct_column = assert_cast<ColumnStruct*>(column.get()); | ||
| } | ||
| if (!struct_column || struct_column->tuple_size() != 2) { | ||
| throw Exception(ErrorCode::INTERNAL_ERROR, | ||
| "only support expand json object int to kv pair column, but given: ", | ||
| struct_column->tuple_size()); | ||
| } | ||
| struct_column->get_column(0).insert_range_from(*_object_pairs.first, _cur_offset, max_step); | ||
| struct_column->get_column(1).insert_range_from(*_object_pairs.second, _cur_offset, | ||
| max_step); | ||
| } | ||
| forward(max_step); | ||
| return max_step; | ||
| } | ||
| } // namespace doris::vectorized |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| // 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. | ||
|
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| #pragma once | ||
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| #include <stddef.h> | ||
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| #include "common/status.h" | ||
| #include "vec/columns/column_map.h" | ||
| #include "vec/data_types/data_type.h" | ||
| #include "vec/data_types/data_type_array.h" | ||
| #include "vec/data_types/data_type_map.h" | ||
| #include "vec/exprs/table_function/table_function.h" | ||
| #include "vec/functions/array/function_array_utils.h" | ||
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| namespace doris::vectorized { | ||
| class Block; | ||
| } // namespace doris::vectorized | ||
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| namespace doris::vectorized { | ||
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| // explode_json_object("{\"a\": 1, \"b\": 2}") -> | ||
| // | key | value | | ||
| // | a | 1 | | ||
| // | b | 2 | | ||
| class VExplodeJsonObjectTableFunction : public TableFunction { | ||
| ENABLE_FACTORY_CREATOR(VExplodeJsonObjectTableFunction); | ||
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| public: | ||
| VExplodeJsonObjectTableFunction(); | ||
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| ~VExplodeJsonObjectTableFunction() override = default; | ||
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| Status process_init(Block* block, RuntimeState* state) override; | ||
| void process_row(size_t row_idx) override; | ||
| void process_close() override; | ||
| void get_same_many_values(MutableColumnPtr& column, int length) override; | ||
| int get_value(MutableColumnPtr& column, int max_step) override; | ||
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| private: | ||
| ColumnPtr _json_object_column; | ||
| std::pair<MutableColumnPtr, MutableColumnPtr> _object_pairs; // ColumnNullable<ColumnString> | ||
| }; | ||
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| } // namespace doris::vectorized |
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70 changes: 70 additions & 0 deletions
70
...ava/org/apache/doris/nereids/trees/expressions/functions/generator/ExplodeJsonObject.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| // 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. | ||
|
|
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| package org.apache.doris.nereids.trees.expressions.functions.generator; | ||
|
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| import org.apache.doris.catalog.FunctionSignature; | ||
| import org.apache.doris.nereids.trees.expressions.Expression; | ||
| import org.apache.doris.nereids.trees.expressions.functions.AlwaysNullable; | ||
| import org.apache.doris.nereids.trees.expressions.literal.StructLiteral; | ||
| import org.apache.doris.nereids.trees.expressions.shape.UnaryExpression; | ||
| import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor; | ||
| import org.apache.doris.nereids.types.JsonType; | ||
| import org.apache.doris.nereids.types.StringType; | ||
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| import com.google.common.base.Preconditions; | ||
| import com.google.common.collect.ImmutableList; | ||
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| import java.util.List; | ||
|
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| /** | ||
| * explode_json_object("{"amory":1, "doris": 2}") generate two column and two lines with: | ||
| * key column: amory, doris | ||
| * value column: 1, 2 | ||
| */ | ||
| public class ExplodeJsonObject extends TableGeneratingFunction implements UnaryExpression, AlwaysNullable { | ||
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| public static final List<FunctionSignature> SIGNATURES = ImmutableList.of( | ||
| FunctionSignature.ret(StructLiteral.constructStructType( | ||
| ImmutableList.of(StringType.INSTANCE, JsonType.INSTANCE))).args(JsonType.INSTANCE)); | ||
|
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| /** | ||
| * constructor with 1 argument. | ||
| */ | ||
| public ExplodeJsonObject(Expression arg) { | ||
| super("explode_json_object", arg); | ||
| } | ||
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| /** | ||
| * withChildren. | ||
| */ | ||
| @Override | ||
| public ExplodeJsonObject withChildren(List<Expression> children) { | ||
| Preconditions.checkArgument(children.size() == 1); | ||
| return new ExplodeJsonObject(children.get(0)); | ||
| } | ||
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| @Override | ||
| public List<FunctionSignature> getSignatures() { | ||
| return SIGNATURES; | ||
| } | ||
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| @Override | ||
| public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) { | ||
| return visitor.visitExplodeJsonObject(this, context); | ||
| } | ||
| } |
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