7ffe88b579
Remove the last element from array.
```
mysql> select array_popback(['test', NULL, 'value']);
+-----------------------------------------------------+
| array_popback(ARRAY('test', NULL, 'value')) |
+-----------------------------------------------------+
| [test, NULL] |
+-----------------------------------------------------+
```
85 lines
3.5 KiB
C++
85 lines
3.5 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include <string_view>
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#include "vec/columns/column_array.h"
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#include "vec/columns/column_string.h"
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#include "vec/common/string_ref.h"
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#include "vec/data_types/data_type_array.h"
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#include "vec/data_types/data_type_number.h"
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#include "vec/functions/array/function_array_utils.h"
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#include "vec/functions/function.h"
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#include "vec/functions/simple_function_factory.h"
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namespace doris::vectorized {
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class FunctionArrayPopback : public IFunction {
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public:
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static constexpr auto name = "array_popback";
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static FunctionPtr create() { return std::make_shared<FunctionArrayPopback>(); }
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/// Get function name.
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String get_name() const override { return name; }
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bool is_variadic() const override { return false; }
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size_t get_number_of_arguments() const override { return 1; }
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DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {
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DCHECK(is_array(arguments[0]))
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<< "First argument for function: " << name
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<< " should be DataTypeArray but it has type " << arguments[0]->get_name() << ".";
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return arguments[0];
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}
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Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,
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size_t result, size_t input_rows_count) override {
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auto array_column =
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block.get_by_position(arguments[0]).column->convert_to_full_column_if_const();
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// extract src array column
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ColumnArrayExecutionData src;
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if (!extract_column_array_info(*array_column, src)) {
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return Status::RuntimeError(
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fmt::format("execute failed, unsupported types for function {}({})", get_name(),
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block.get_by_position(arguments[0]).type->get_name()));
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}
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// prepare dst array column
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bool is_nullable = src.nested_nullmap_data ? true : false;
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ColumnArrayMutableData dst = create_mutable_data(src.nested_col, is_nullable);
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dst.offsets_ptr->reserve(input_rows_count);
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// start from 1
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auto offset_column = ColumnInt64::create(array_column->size(), 1);
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// len - 1
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auto length_column = ColumnInt64::create();
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for (size_t row = 0; row < src.offsets_ptr->size(); ++row) {
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size_t off = (*src.offsets_ptr)[row - 1];
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size_t len = (*src.offsets_ptr)[row] - off;
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length_column->insert_value(len - 1);
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}
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slice_array(dst, src, *offset_column, length_column.get());
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ColumnPtr res_column = assemble_column_array(dst);
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block.replace_by_position(result, std::move(res_column));
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return Status::OK();
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}
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};
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void register_function_array_popback(SimpleFunctionFactory& factory) {
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factory.register_function<FunctionArrayPopback>();
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}
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} // namespace doris::vectorized
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