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src/sql/engine/expr/ob_expr_tan.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 "lib/oblog/ob_log.h"
+#include "lib/number/ob_number_v2.h"
+#include "sql/engine/expr/ob_expr_tan.h"
+#include "sql/engine/expr/ob_expr_util.h"
+#include "sql/parser/ob_item_type.h"
+#include "sql/session/ob_sql_session_info.h"
+#include <math.h>
+
+namespace oceanbase {
+using namespace common;
+using namespace common::number;
+namespace sql {
+
+ObExprTan::ObExprTan(ObIAllocator& alloc) : ObFuncExprOperator(alloc, T_FUN_SYS_TAN, N_TAN, 1, NOT_ROW_DIMENSION)
+{}
+
+ObExprTan::~ObExprTan()
+{}
+
+int ObExprTan::calc_result_type1(ObExprResType& type, ObExprResType& radian, ObExprTypeCtx& type_ctx) const
+{
+  return calc_trig_function_result_type1(type, radian, type_ctx);
+}
+
+int ObExprTan::calc_result1(ObObj& result, const ObObj& radian_obj, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (radian_obj.is_null_oracle()) {
+    result.set_null();
+  } else if (OB_ISNULL(expr_ctx.calc_buf_)) {
+    ret = OB_NOT_INIT;
+  } else if (radian_obj.is_number()) {
+    ObNumber ret_number;
+    ObNumber radian_number;
+    if (OB_FAIL(radian_obj.get_number(radian_number))) {
+      LOG_WARN("get_number failed", K(radian_obj));
+    } else if (OB_FAIL(radian_number.tan(ret_number, *(expr_ctx.calc_buf_)))) {
+      LOG_WARN("taylor_series_tan failed", K(radian_number), K(ret));
+    } else {
+      result.set_number(ret_number);
+    }
+  } else if (radian_obj.is_double()) {
+    double arg = radian_obj.get_double();
+    double res = tan(arg);
+    if (isinf(res) || isnan(res)) {
+      ret = OB_OPERATE_OVERFLOW;
+    } else {
+      result.set_double(res);
+    }
+  }
+  return ret;
+}
+
+DEF_CALC_TRIGONOMETRIC_EXPR(tan, (isinf(arg) || isnan(arg)), OB_OPERATE_OVERFLOW);
+
+int ObExprTan::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);
+  rt_expr.eval_func_ = calc_tan_expr;
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase