support json type
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xj0
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src/sql/engine/expr/ob_expr_json_value.h
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178
src/sql/engine/expr/ob_expr_json_value.h
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/**
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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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// This file is for func json_value.
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#ifndef OCEANBASE_SQL_OB_EXPR_JSON_VALUE_H_
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#define OCEANBASE_SQL_OB_EXPR_JSON_VALUE_H_
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#include "sql/engine/expr/ob_expr_operator.h"
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#include "lib/json_type/ob_json_tree.h"
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#include "lib/json_type/ob_json_base.h"
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using namespace oceanbase::common;
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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
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ObExprJsonValue : public ObFuncExprOperator
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{
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public:
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explicit ObExprJsonValue(common::ObIAllocator &alloc);
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virtual ~ObExprJsonValue();
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virtual int calc_result_typeN(ObExprResType& type,
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ObExprResType* types,
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int64_t param_num,
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common::ObExprTypeCtx& type_ctx)
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const override;
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virtual int calc_resultN(common::ObObj& result,
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const common::ObObj* objs_stack,
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int64_t param_num,
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common::ObExprCtx& expr_ctx)
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const override;
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static int eval_json_value(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const override;
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virtual common::ObCastMode get_cast_mode() const { return CM_ERROR_ON_SCALE_OVER;}
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private:
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/* code for cast accuracy check */
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template<typename Obj>
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static int check_default_val_accuracy(const ObAccuracy &accuracy,
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const ObObjType &type,
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const Obj *obj);
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static int get_accuracy_internal(common::ObAccuracy &accuracy,
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ObObjType &dest_type,
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const int64_t value,
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const ObLengthSemantics &length_semantics);
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static int get_accuracy(const ObExpr &expr,
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ObEvalCtx& ctx,
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common::ObAccuracy &accuracy,
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ObObjType &dest_type,
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bool &is_cover_by_error);
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static int number_range_check(const common::ObAccuracy &accuracy,
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ObIAllocator *allocator,
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number::ObNumber &val,
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bool strict = false);
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static int datetime_scale_check(const common::ObAccuracy &accuracy,
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int64_t &value,
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bool strict = false);
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static int time_scale_check(const common::ObAccuracy &accuracy, int64_t &value,
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bool strict = false);
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/* cast wrapper to dst type with accuracy check*/
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static int get_cast_ret(int ret);
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static int cast_to_int(ObIJsonBase *j_base, ObObjType dst_type, int64_t &val);
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static int cast_to_uint(ObIJsonBase *j_base, ObObjType dst_type, uint64_t &val);
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static int cast_to_datetime(ObIJsonBase *j_base,
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common::ObAccuracy &accuracy,
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int64_t &val);
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static int cast_to_otimstamp(ObIJsonBase *j_base,
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const ObBasicSessionInfo *session,
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common::ObAccuracy &accuracy,
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ObObjType dst_type,
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ObOTimestampData &out_val);
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static int cast_to_date(ObIJsonBase *j_base, int32_t &val);
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static int cast_to_time(ObIJsonBase *j_base,
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common::ObAccuracy &accuracy,
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int64_t &val);
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static int cast_to_year(ObIJsonBase *j_base, uint8_t &val);
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static int cast_to_float(ObIJsonBase *j_base, ObObjType dst_type, float &val);
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static int cast_to_double(ObIJsonBase *j_base, ObObjType dst_type, double &val);
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static int cast_to_number(common::ObIAllocator *allocator,
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ObIJsonBase *j_base,
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common::ObAccuracy &accuracy,
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ObObjType dst_type,
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number::ObNumber &val);
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static int cast_to_string(common::ObIAllocator *allocator,
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ObIJsonBase *j_base,
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ObCollationType in_cs_type,
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ObCollationType dst_cs_type,
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common::ObAccuracy &accuracy,
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ObObjType dst_type,
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ObString &val);
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static int cast_to_bit(ObIJsonBase *j_base, uint64_t &val);
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static int cast_to_json(common::ObIAllocator *allocator, ObIJsonBase *j_base, ObString &val);
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static int cast_to_res(common::ObIAllocator *allocator,
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ObExprCtx& expr_ctx,
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ObIJsonBase *j_base,
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uint8_t error_type,
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ObObj *error_val,
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common::ObAccuracy &accuracy,
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ObObjType dst_type,
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common::ObCollationType in_coll_type,
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common::ObCollationType dst_coll_type,
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common::ObCollationLevel dst_coll_level,
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ObObj &res);
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static int cast_to_res(common::ObIAllocator *allocator,
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const ObExpr &expr,
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ObEvalCtx &ctx,
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ObIJsonBase *j_base,
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uint8_t error_type,
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ObDatum *error_val,
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common::ObAccuracy &accuracy,
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ObObjType dst_type,
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common::ObCollationType in_coll_type,
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common::ObCollationType dst_coll_type,
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ObDatum &res);
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template<typename Obj>
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static bool try_set_error_val(Obj &res, int &ret, uint8_t error_type, Obj *error_val);
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// new sql engine
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static inline void set_val(ObDatum &res, ObDatum *val)
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{ res.set_datum(*val); }
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// old sql engine
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static inline void set_val(ObObj &res, ObObj *val)
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{ res = *val; }
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/* process empty or error */
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const static uint8_t OB_JSON_ON_RESPONSE_ERROR = 0;
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const static uint8_t OB_JSON_ON_RESPONSE_NULL = 1;
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const static uint8_t OB_JSON_ON_RESPONSE_DEFAULT = 2;
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const static uint8_t OB_JSON_ON_RESPONSE_IMPLICIT = 3;
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int get_on_empty_or_error_old(const ObObj *params,
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ObExprCtx& expr_ctx,
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const ObObjType dst_type,
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uint8_t index,
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bool &is_cover_by_error,
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const ObAccuracy &accuracy,
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uint8 &type,
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ObObj *default_value) const;
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static int get_on_empty_or_error(const ObExpr &expr,
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ObEvalCtx &ctx,
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uint8_t index,
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bool &is_cover_by_error,
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const ObAccuracy &accuracy,
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uint8 &type,
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ObDatum **default_value);
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/* code from ob_expr_cast for cal_result_type */
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const static int32_t OB_LITERAL_MAX_INT_LEN = 21;
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int get_cast_type(const ObExprResType param_type2, ObExprResType &dst_type) const;
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int set_dest_type(ObExprResType &type1, ObExprResType &type, ObExprResType &dst_type, ObExprTypeCtx &type_ctx) const;
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int get_cast_string_len(ObExprResType &type1,
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ObExprResType &type2,
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common::ObExprTypeCtx &type_ctx,
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int32_t &res_len,
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int16_t &length_semantics,
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common::ObCollationType conn) const;
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int get_cast_inttc_len(ObExprResType &type1,
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ObExprResType &type2,
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common::ObExprTypeCtx &type_ctx,
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int32_t &res_len,
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int16_t &length_semantics,
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common::ObCollationType conn) const;
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObExprJsonValue);
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};
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} // sql
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} // oceanbase
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#endif // OCEANBASE_SQL_OB_EXPR_JSON_VALUE_H_
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