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src/sql/engine/expr/ob_expr_exp.cpp

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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.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+#include <math.h>
+#include "share/object/ob_obj_cast.h"
+#include "sql/engine/expr/ob_expr_exp.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "lib/number/ob_number_v2.h"
+
+namespace oceanbase {
+using namespace oceanbase::common;
+
+namespace sql {
+ObExprExp::ObExprExp(ObIAllocator& alloc) : ObFuncExprOperator(alloc, T_FUN_SYS_EXP, N_EXP, 1, NOT_ROW_DIMENSION)
+{}
+
+ObExprExp::~ObExprExp()
+{}
+
+int ObExprExp::calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const
+{
+  return calc_trig_function_result_type1(type, type1, type_ctx);
+}
+
+int ObExprExp::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (OB_ISNULL(expr_ctx.calc_buf_)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("varchar buffer not init", K(ret));
+  } else if (obj.is_null()) {
+    result.set_null();
+  } else if (obj.is_number()) {
+    const number::ObNumber arg_number = obj.get_number();
+    number::ObNumber result_number;
+    common::ObIAllocator& allocator = *(expr_ctx.calc_buf_);
+    if (OB_FAIL(arg_number.e_power(result_number, allocator))) {
+      LOG_WARN("e_power failed", K(ret), K(arg_number), K(result_number));
+    } else {
+      result.set_number(result_number);
+    }
+  } else if (obj.is_double()) {
+    double value = obj.get_double();
+    value = exp(value);
+    if (isinf(value) || isnan(value)) {
+      ret = OB_OPERATE_OVERFLOW;
+    } else {
+      result.set_double(value);
+    }
+  } else {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("obj type should be number or double", K(obj), K(ret));
+  }
+  return ret;
+}
+
+int calc_exp_expr_double(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* arg = NULL;
+  if (OB_FAIL(expr.args_[0]->eval(ctx, arg))) {
+    LOG_WARN("eval arg failed", K(ret), K(expr));
+  } else if (arg->is_null()) {
+    res_datum.set_null();
+  } else {
+    double value = arg->get_double();
+    value = std::exp(value);
+    if (isinf(value) || isnan(value)) {
+      ret = OB_OPERATE_OVERFLOW;
+    } else {
+      res_datum.set_double(value);
+    }
+  }
+  return ret;
+}
+
+int calc_exp_expr_number(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* arg = NULL;
+  if (OB_FAIL(expr.args_[0]->eval(ctx, arg))) {
+    LOG_WARN("eval arg failed", K(ret), K(expr));
+  } else if (arg->is_null()) {
+    res_datum.set_null();
+  } else {
+    number::ObNumber arg_nmb(arg->get_number());
+    number::ObNumber res_nmb;
+    if (OB_FAIL(arg_nmb.e_power(res_nmb, ctx.get_reset_tmp_alloc()))) {
+      LOG_WARN("e_power failed", K(ret));
+    } else {
+      res_datum.set_number(res_nmb);
+    }
+  }
+  return ret;
+}
+
+int ObExprExp::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr_cg_ctx);
+  UNUSED(raw_expr);
+  if (OB_UNLIKELY(1 != rt_expr.arg_cnt_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("invalid arg_cnt_ of expr", K(ret), K(rt_expr));
+  } else {
+    ObObjType arg_res_type = rt_expr.args_[0]->datum_meta_.type_;
+    if (ObDoubleType == arg_res_type) {
+      rt_expr.eval_func_ = calc_exp_expr_double;
+    } else if (ObNumberType == arg_res_type) {
+      rt_expr.eval_func_ = calc_exp_expr_number;
+    } else {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("arg type must be double or number", K(ret), K(arg_res_type));
+    }
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase