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src/sql/engine/expr/ob_expr_pow.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_pow.h"
+#include "sql/session/ob_sql_session_info.h"
+
+namespace oceanbase {
+using namespace oceanbase::common;
+
+namespace sql {
+
+ObExprPow::ObExprPow(ObIAllocator& alloc) : ObExprOperator(alloc, T_OP_POW, N_POW, 2, NOT_ROW_DIMENSION)
+{}
+
+int ObExprPow::calc_result_type2(
+    ObExprResType& type, ObExprResType& type1, ObExprResType& type2, ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  int ret = OB_SUCCESS;
+  UNUSED(type2);
+  const ObSQLSessionInfo* session = dynamic_cast<const ObSQLSessionInfo*>(type_ctx.get_session());
+  if (!lib::is_mysql_mode()) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("pow is only for mysql mode", K(ret));
+  } else if (OB_ISNULL(session)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("cast basic session to sql session failed", K(ret));
+  } else if (NOT_ROW_DIMENSION == row_dimension_) {
+    if (ObMaxType == type1.get_type()) {
+      ret = OB_ERR_INVALID_TYPE_FOR_OP;
+    } else {
+      type.set_double();
+      if (session->use_static_typing_engine()) {
+        type1.set_calc_type(ObDoubleType);
+        type2.set_calc_type(ObDoubleType);
+        // pow donot return error code in mysql mode
+        //  eg: insert into t1 select pow('a', 2);
+        type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_WARN_ON_FAIL);
+      }
+    }
+    ObExprOperator::calc_result_flag2(type, type1, type2);
+    // just keep enumset as origin
+  } else {
+    ret = OB_ERR_INVALID_TYPE_FOR_OP;  // arithmetic not support row
+  }
+  return ret;
+}
+
+int ObExprPow::calc_result2(ObObj& result, const ObObj& obj1, const ObObj& obj2, ObExprCtx& expr_ctx) const
+{
+  return calc(result, obj1, obj2, expr_ctx);
+}
+
+int ObExprPow::safe_set_double(ObObj& result, double value)
+{
+  int ret = OB_SUCCESS;
+  if (isinfl(value) || isnan(static_cast<float>(value))) {
+    ret = OB_OPERATE_OVERFLOW;
+  } else {
+    result.set_double(value);
+  }
+  return ret;
+}
+
+int ObExprPow::safe_set_double(ObDatum& datum, double value)
+{
+  int ret = OB_SUCCESS;
+  if (isinfl(value) || isnan(static_cast<float>(value))) {
+    ret = OB_OPERATE_OVERFLOW;
+  } else {
+    datum.set_double(value);
+  }
+  return ret;
+}
+
+int ObExprPow::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 {
+    double double_v1 = 0;
+    double double_v2 = 0;
+    EXPR_DEFINE_CAST_CTX(expr_ctx, CM_WARN_ON_FAIL);
+    if (OB_SUCC(ret)) {
+      EXPR_GET_DOUBLE_V2(obj1, double_v1);
+    }
+    if (OB_SUCC(ret)) {
+      EXPR_GET_DOUBLE_V2(obj2, double_v2);
+    }
+
+    if (OB_SUCC(ret)) {
+      ret = safe_set_double(result, pow(double_v1, double_v2));
+    }
+  }
+  return ret;
+}
+
+int ObExprPow::calc_pow_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  // pow(base, exp)
+  ObDatum* base = NULL;
+  ObDatum* exp = NULL;
+  int ret_base = expr.args_[0]->eval(ctx, base);
+  int ret_exp = expr.args_[1]->eval(ctx, exp);
+  if (OB_SUCCESS == ret_base && OB_SUCCESS == ret_exp) {
+    if (base->is_null() || exp->is_null()) {
+      res_datum.set_null();
+    } else {
+      ret = ObExprPow::safe_set_double(res_datum, std::pow(base->get_double(), exp->get_double()));
+    }
+  }
+  return ret;
+}
+
+int ObExprPow::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());
+  OX(rt_expr.eval_func_ = calc_pow_expr);
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase