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src/sql/engine/expr/ob_expr_func_part_hash.h Normal file
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/**
* Copyright (c) 2021 OceanBase
* OceanBase CE is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
#ifndef OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_FUNC_HASH_
#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_FUNC_HASH_
#include "sql/engine/expr/ob_expr_operator.h"
namespace oceanbase {
namespace sql {
class ObTaskExecutorCtx;
class ObExprFuncPartOldHash : public ObFuncExprOperator {
public:
explicit ObExprFuncPartOldHash(common::ObIAllocator& alloc);
virtual ~ObExprFuncPartOldHash();
virtual int calc_result_typeN(
ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
virtual int calc_resultN(
common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;
static int calc_value(
common::ObExprCtx& expr_ctx, const common::ObObj* objs_stack, int64_t param_num, common::ObObj& result);
static uint64_t calc_hash_value_with_seed(const common::ObObj& obj, int64_t seed);
static int calc_value_for_oracle(const common::ObObj* objs_stack, int64_t param_num, common::ObObj& result);
static int calc_value_for_mysql(const common::ObObj& obj1, common::ObObj& result);
static bool is_virtual_part_for_oracle(const ObTaskExecutorCtx* task_ec);
static int calc_oracle_vt_part_id(ObTaskExecutorCtx& task_exec_ctx, uint64_t table_id,
const common::ObObj* objs_stack, int64_t param_num, common::ObObj& result);
virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int eval_old_part_hash(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int eval_oracle_old_part_hash(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, uint64_t seed);
private:
static int eval_vt_old_part_id(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum,
ObTaskExecutorCtx& task_exec_ctx, const uint64_t table_id);
static bool is_oracle_supported_type(const common::ObObjType type);
// disallow copy
DISALLOW_COPY_AND_ASSIGN(ObExprFuncPartOldHash);
};
///////////////////////////////////////////////////////////////////////////////
// call new hash functions, solve partition row skew problem
class ObTaskExecutorCtx;
class ObExprFuncPartHash : public ObFuncExprOperator {
public:
explicit ObExprFuncPartHash(common::ObIAllocator& alloc);
virtual ~ObExprFuncPartHash();
virtual int calc_result_typeN(
ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
virtual int calc_resultN(
common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;
static int calc_value(
common::ObExprCtx& expr_ctx, const common::ObObj* objs_stack, int64_t param_num, common::ObObj& result);
static uint64_t calc_hash_value_with_seed(const common::ObObj& obj, int64_t seed);
static int calc_value_for_oracle(const common::ObObj* objs_stack, int64_t param_num, common::ObObj& result);
static int calc_value_for_mysql(const common::ObObj& obj1, common::ObObj& result);
static bool is_virtual_part_for_oracle(const ObTaskExecutorCtx* task_ec);
static int calc_oracle_vt_part_id(ObTaskExecutorCtx& task_exec_ctx, uint64_t table_id,
const common::ObObj* objs_stack, int64_t param_num, common::ObObj& result);
virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int eval_part_hash(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
static int eval_oracle_part_hash(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, uint64_t seed);
private:
static int eval_vt_part_id(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, ObTaskExecutorCtx& task_exec_ctx,
const uint64_t table_id);
static bool is_oracle_supported_type(const common::ObObjType type);
private:
// disallow copy
DISALLOW_COPY_AND_ASSIGN(ObExprFuncPartHash);
};
} // namespace sql
} // namespace oceanbase
#endif // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_FUNC_HASH_