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src/sql/engine/expr/ob_expr_power.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_power.h"
+#include "sql/engine/expr/ob_expr_pow.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "lib/number/ob_number_v2.h"
+
+namespace oceanbase {
+using namespace oceanbase::common;
+
+namespace sql {
+ObExprPower::ObExprPower(ObIAllocator& alloc) : ObExprOperator(alloc, T_FUN_SYS_POWER, N_POWER, 2, NOT_ROW_DIMENSION)
+{}
+
+int ObExprPower::calc_result_type2(
+    ObExprResType& type, ObExprResType& type1, ObExprResType& type2, ObExprTypeCtx& type_ctx) const
+{
+  return calc_trig_function_result_type2(type, type1, type2, type_ctx);
+}
+
+int ObExprPower::calc_result2(ObObj& result, const ObObj& obj1, const ObObj& obj2, ObExprCtx& expr_ctx) const
+{
+  return calc(result, obj1, obj2, expr_ctx);
+}
+
+int ObExprPower::calc(ObObj& result, const ObObj& obj1, const ObObj& obj2, ObExprCtx& expr_ctx)
+{
+  int ret = OB_SUCCESS;
+  if (obj1.is_null() || obj2.is_null()) {
+    result.set_null();
+  } else if (obj1.is_number() && obj2.is_int()) {
+    // TODO this path is never used ?
+    // TODO copied code
+    LOG_DEBUG("ObExprPower, power_int path start");
+    const number::ObNumber base_number = obj1.get_number();
+    const int exponent_int = obj2.get_int();
+    number::ObNumber result_number;
+    common::ObIAllocator& allocator = *(expr_ctx.calc_buf_);
+    if (OB_FAIL(base_number.power(exponent_int, result_number, allocator))) {
+      LOG_WARN("power (int exponent) failed", K(ret), K(base_number), K(exponent_int), K(result_number));
+    } else {
+      result.set_number(result_number);
+      LOG_DEBUG("ObExprPower, power_int path end successfully");
+    }
+  } else if (obj1.is_number() && obj2.is_number()) {
+    LOG_DEBUG("ObExprPower, both-ObNumber path start");
+    const number::ObNumber base_number = obj1.get_number();
+    const number::ObNumber exponent_number = obj2.get_number();
+    number::ObNumber result_number;
+    common::ObIAllocator& allocator = *(expr_ctx.calc_buf_);
+    if (OB_FAIL(base_number.power(exponent_number, result_number, allocator))) {
+      LOG_WARN("power failed", K(ret), K(base_number), K(exponent_number), K(result_number));
+    } else {
+      result.set_number(result_number);
+      LOG_DEBUG("ObExprPower, ObNumber path end successfully");
+    }
+  } else if (obj1.is_double() && obj2.is_double()) {
+    // same as oracle behavior: if at least one of the arguments is
+    // binary_double, result type is double
+    double double_base = obj1.get_double();
+    double double_exponent = obj2.get_double();
+    double result_double = std::pow(double_base, double_exponent);
+    if (isinf(result_double) || isnan(result_double)) {
+      ret = OB_OPERATE_OVERFLOW;
+    } else {
+      result.set_double(result_double);
+    }
+  } else {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("obj type should be number or double", K(obj1), K(obj2), K(ret));
+  }
+  return ret;
+}
+int calc_power_expr_oracle(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  // power(base, exp)
+  ObDatum* base = NULL;
+  ObDatum* exp = NULL;
+  if (OB_FAIL(expr.args_[0]->eval(ctx, base)) || OB_FAIL(expr.args_[1]->eval(ctx, exp))) {
+    LOG_WARN("eval arg failed", K(ret), K(expr));
+  } else if (base->is_null() || exp->is_null()) {
+    res_datum.set_null();
+  } else {
+    if (ObDoubleType == expr.datum_meta_.type_) {
+      ret = ObExprPow::safe_set_double(res_datum, std::pow(base->get_double(), exp->get_double()));
+    } else {
+      const number::ObNumber base_nmb(base->get_number());
+      const number::ObNumber exp_nmb(exp->get_number());
+      number::ObNumber res_nmb;
+      if (OB_FAIL(base_nmb.power(exp_nmb, res_nmb, ctx.get_reset_tmp_alloc()))) {
+        LOG_WARN("calc power failed", K(ret), K(base_nmb), K(exp_nmb));
+      } else {
+        res_datum.set_number(res_nmb);
+      }
+    }
+  }
+  return ret;
+}
+
+int ObExprPower::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr_cg_ctx);
+  CK(2 == raw_expr.get_param_count());
+  if (OB_SUCC(ret)) {
+    if (share::is_oracle_mode()) {
+      rt_expr.eval_func_ = calc_power_expr_oracle;
+    } else {
+      rt_expr.eval_func_ = ObExprPow::calc_pow_expr;
+    }
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase