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src/sql/engine/expr/ob_expr_strcmp.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 "ob_expr_strcmp.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "share/object/ob_obj_cast.h"
+
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprStrcmp::ObExprStrcmp(ObIAllocator& alloc)
+    : ObRelationalExprOperator::ObRelationalExprOperator(alloc, T_FUN_SYS_STRCMP, N_STRCMP, 2, NOT_ROW_DIMENSION)
+{}
+
+int ObExprStrcmp::calc_result_type2(
+    ObExprResType& type, ObExprResType& type1, ObExprResType& type2, ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type2);
+  UNUSED(type_ctx);
+  int ret = OB_SUCCESS;
+  type.set_int();
+  type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].scale_);
+  type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
+  ObCollationType coll_type = CS_TYPE_INVALID;
+  ObCollationLevel coll_level = CS_LEVEL_EXPLICIT;
+  ret = ObCharset::aggregate_collation(type1.get_collation_level(),
+      type1.get_collation_type(),
+      type2.get_collation_level(),
+      type2.get_collation_type(),
+      coll_level,
+      coll_type);
+  type.set_calc_type(ObVarcharType);
+  type.set_calc_collation_type(coll_type);
+  type.set_calc_collation_level(coll_level);
+  type1.set_calc_type(ObVarcharType);
+  type2.set_calc_type(ObVarcharType);
+  type1.set_calc_collation_type(coll_type);
+  type2.set_calc_collation_type(coll_type);
+
+  return ret;
+}
+
+int ObExprStrcmp::calc_result2(ObObj& result, const ObObj& obj1, const ObObj& obj2, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (obj1.is_null() || obj2.is_null()) {
+    result.set_null();
+  } else if (OB_ISNULL(cmp_op_func2_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("unexpected error. cmp func is null", K(obj1), K(obj2), K(common::lbt()));
+  } else {
+    TYPE_CHECK(obj1, ObVarcharType);
+    TYPE_CHECK(obj2, ObVarcharType);
+    EXPR_DEFINE_CMP_CTX(result_type_.get_calc_meta(), false, expr_ctx);
+    if (OB_FAIL(compare_nocast(result, obj1, obj2, cmp_ctx, CO_CMP, cmp_op_func2_))) {
+      LOG_WARN("failed to compare objects", K(ret), K(obj1), K(obj2));
+    }
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase