121 lines
3.9 KiB
C++
121 lines
3.9 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 SRC_SQL_ENGINE_EXPR_OB_EXPR_UUID_H_
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#define SRC_SQL_ENGINE_EXPR_OB_EXPR_UUID_H_
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#include "sql/engine/expr/ob_expr_operator.h"
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namespace oceanbase {
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namespace sql {
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class ObBigEndian {
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public:
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static int put_uint16(unsigned char* b, uint16_t v);
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static int put_uint32(unsigned char* b, uint32_t v);
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObBigEndian);
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};
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struct ObUUIDNode {
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ObUUIDNode();
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int init();
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unsigned char mac_addr_[6];
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bool is_inited_;
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};
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class ObUUIDTime {
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public:
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static int get_time(uint64_t& time, uint16_t& seq);
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private:
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static int time_now(uint64_t& now);
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static void reset_clock_seq();
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static const uint64_t LILLIAN = 2299160; // Julian day of 15 Oct 1582
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static const uint64_t UNIXX = 2440587; // Julian day of 1 Jan 1970
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static const uint64_t EPOCH = UNIXX - LILLIAN; // Days between EPOCHs
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static const uint64_t G1582 = EPOCH * 86400; // seconds between EPOCHs
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static const uint64_t G1582NS100 = G1582 * 10000000; // 100s of a nanoseconds between EPOCHs
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static uint64_t lasttime_;
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static uint16_t clock_seq_;
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static common::ObLatch lock_;
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};
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class ObExprUuid : public ObFuncExprOperator {
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public:
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explicit ObExprUuid(common::ObIAllocator& alloc);
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explicit ObExprUuid(
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common::ObIAllocator& alloc, ObExprOperatorType type, const char* name, int32_t param_num, int32_t dimension);
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virtual ~ObExprUuid();
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virtual int calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const;
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virtual int calc_result0(common::ObObj& result, common::ObExprCtx& expr_ctx) const;
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static int init();
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static int eval_uuid(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
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virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
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protected:
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static int calc(unsigned char* scratch);
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// aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee
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static const common::ObLength LENGTH_UUID = 36; // chars not bytes
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private:
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static ObUUIDNode* uuid_node;
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprUuid);
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};
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inline int ObExprUuid::calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const
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{
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UNUSED(type_ctx);
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type.set_varchar();
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type.set_collation_level(common::CS_LEVEL_IMPLICIT);
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type.set_collation_type(common::ObCharset::get_default_collation(common::ObCharset::get_default_charset()));
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type.set_length(ObExprUuid::LENGTH_UUID);
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return common::OB_SUCCESS;
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}
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class ObExprSysGuid : public ObExprUuid {
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public:
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explicit ObExprSysGuid(common::ObIAllocator& alloc);
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virtual ~ObExprSysGuid();
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virtual int calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const;
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virtual int calc_result0(common::ObObj& result, common::ObExprCtx& expr_ctx) const;
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static int eval_sys_guid(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
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virtual int cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& rt_expr) const override
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{
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rt_expr.eval_func_ = eval_sys_guid;
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return common::OB_SUCCESS;
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}
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private:
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static const common::ObLength LENGTH_SYS_GUID = 16;
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprSysGuid);
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};
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inline int ObExprSysGuid::calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const
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{
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UNUSED(type_ctx);
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type.set_raw();
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type.set_length(LENGTH_SYS_GUID);
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return common::OB_SUCCESS;
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}
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} // namespace sql
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} // namespace oceanbase
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#endif /* SRC_SQL_ENGINE_EXPR_OB_EXPR_UUID_H_ */
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