patch 4.0

src/sql/engine/expr/ob_expr_errno.cpp

@@ -0,0 +1,126 @@
+/**
+ * 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 "sql/engine/ob_exec_context.h"
+#include "sql/engine/expr/ob_expr_errno.h"
+#include "lib/timezone/ob_time_convert.h"
+#include "sql/session/ob_sql_session_info.h"
+
+namespace oceanbase
+{
+using namespace common;
+namespace sql
+{
+
+ObExprErrno::ObExprErrno(ObIAllocator &alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_ERRNO, N_SYS_ERRNO, ONE_OR_TWO, NOT_ROW_DIMENSION)
+{
+}
+
+ObExprErrno::~ObExprErrno()
+{
+}
+
+int ObExprErrno::calc_result_typeN(ObExprResType &type,
+                                   ObExprResType *types_array,
+                                   int64_t param_num,
+                                   ObExprTypeCtx &type_ctx) const
+{
+  int ret = OB_SUCCESS;
+  type.set_int();
+  type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].precision_);
+  type.set_scale(common::DEFAULT_SCALE_FOR_INTEGER);
+  CK(OB_NOT_NULL(type_ctx.get_session()));
+  for (int64_t i = 0; OB_SUCC(ret) && i < param_num; ++i) {
+    auto &param = types_array[i];
+    param.set_calc_type(ObNumberType);
+  }
+  return ret;
+}
+
+int ObExprErrno::cg_expr(ObExprCGCtx &ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(ctx);
+  UNUSED(raw_expr);
+  CK(1 == rt_expr.arg_cnt_ || 2 == rt_expr.arg_cnt_);
+  OX(rt_expr.eval_func_ = eval_errno);
+  return ret;
+}
+
+int ObExprErrno::get_value(const number::ObNumber &nmb, int64_t &value)
+{
+  int ret = OB_SUCCESS;
+  value = 0;
+  int64_t tmp = 0;
+  if (!nmb.is_valid_int64(tmp)) { //based on the behaviour of mysql.
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("out of range", K(ret), K(nmb));
+  } else {
+    value = tmp;
+  }
+  return ret;
+}
+
+int ObExprErrno::conv2errno(int64_t value)
+{
+  int ret = OB_SUCCESS;
+  if (value < 0) {
+    ret = static_cast<int>(value);
+  }
+  return ret;
+}
+
+// trigger and exception using `select errno(-4038) from dual`
+int ObExprErrno::eval_errno(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
+{
+  int ret = OB_SUCCESS;
+  if (OB_FAIL(expr.eval_param_value(ctx))) {
+    LOG_WARN("evaluate parameters failed", K(ret));
+  } else {
+    int64_t value = 0;
+    res.set_null();
+    if (1 == expr.arg_cnt_) {
+      ObDatum *val = &expr.locate_param_datum(ctx, 0);
+      if (val->is_null()) {
+      } else if (OB_FAIL(get_value(number::ObNumber(val->get_number()), value))) {
+        ret = OB_SUCCESS;
+      } else {
+        ret = conv2errno(value); // throw error if value < 0
+        res.set_int(value); // abritary value is OK
+      }
+    } else if (2 == expr.arg_cnt_) {
+      ObDatum *val = &expr.locate_param_datum(ctx, 0);
+      ObDatum *timeout_val = &expr.locate_param_datum(ctx, 1);
+      int64_t timeout = 0;
+      if (val->is_null() || timeout_val->is_null()) {
+      } else if (OB_FAIL(get_value(number::ObNumber(val->get_number()), value))) {
+        ret = OB_SUCCESS;
+      } else if (OB_FAIL(get_value(number::ObNumber(timeout_val->get_number()), timeout))) {
+        ret = OB_SUCCESS;
+      } else if (ctx.exec_ctx_.get_my_session()->get_query_start_time() + timeout > ObTimeUtility::current_time()) {
+        ret = conv2errno(value); // throw error if value < 0
+        res.set_int(value); // abritary value is OK
+      } else {
+        // time up! just eval the value and return the value, don't throw exception
+        res.set_int(value);
+      }
+    }
+  }
+  return ret;
+}
+
+
+} //namespace sql
+} //namespace oceanbase