96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef OCEANBASE_BASIC_OB_LIMIT_OP_H_
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#define OCEANBASE_BASIC_OB_LIMIT_OP_H_
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#include "sql/engine/ob_operator.h"
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#include "sql/engine/basic/ob_chunk_datum_store.h"
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namespace oceanbase
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{
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namespace sql
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{
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class ObLimitSpec : public ObOpSpec
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{
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OB_UNIS_VERSION_V(1);
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public:
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ObLimitSpec(common::ObIAllocator &alloc, const ObPhyOperatorType type);
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INHERIT_TO_STRING_KV("op_spec", ObOpSpec,
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K_(limit_expr), K_(offset_expr), K_(percent_expr),
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K_(calc_found_rows), K_(is_top_limit), K_(is_fetch_with_ties),
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K_(sort_columns));
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ObExpr *limit_expr_;
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ObExpr *offset_expr_;
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ObExpr *percent_expr_;
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// mysql SQL_CALC_FOUND_ROWS query modifier, count found rows after reach limit.
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bool calc_found_rows_;
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bool is_top_limit_;
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bool is_fetch_with_ties_;
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ExprFixedArray sort_columns_;
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};
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class ObLimitOp : public ObOperator
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{
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public:
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ObLimitOp(ObExecContext &exec_ctx, const ObOpSpec &spec, ObOpInput *input);
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virtual int inner_open() override;
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virtual int inner_rescan() override;
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virtual int inner_get_next_row() override;
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virtual int inner_get_next_batch(const int64_t max_row_cnt) override;
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virtual void destroy() override { ObOperator::destroy(); }
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static int get_int_val(ObExpr *expr, ObEvalCtx &eval_ctx, int64_t &val, bool &is_null_value);
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static int get_double_val(ObExpr *expr, ObEvalCtx &eval_ctx, double &val);
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private:
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int convert_limit_percent();
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int is_row_order_by_item_value_equal(bool &is_equal);
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// batch version for routine is_row_order_by_item_value_equal()
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int compare_value_in_batch(bool &is_iterator_end, const ObBitVector &skip,
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const int64_t batch_size,
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uint32_t &row_count_match);
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OB_INLINE int64_t find_last_available_row_cnt(const ObBitVector &skip, const int64_t batch_size)
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{
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int64_t row_num = 0;
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for (int64_t i = (batch_size - 1); i >= 0; i--) {
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if (!skip.at(i)) {
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row_num = i;
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break;
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}
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}
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return row_num;
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}
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private:
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int64_t limit_;
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int64_t offset_;
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int64_t input_cnt_;
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int64_t output_cnt_;
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int64_t total_cnt_;
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bool is_percent_first_;
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ObChunkDatumStore::LastStoredRow pre_sort_columns_;
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};
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} // end namespace sql
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} // end namespace oceanbase
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#endif // OCEANBASE_BASIC_OB_LIMIT_OP_H_
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