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src/sql/engine/expr/ob_expr_char_length.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 "sql/engine/expr/ob_expr_char_length.h"
+
+namespace oceanbase {
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+
+namespace sql {
+
+ObExprCharLength::ObExprCharLength(ObIAllocator& alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_CHAR_LENGTH, N_CHAR_LENGTH, 1, NOT_ROW_DIMENSION)
+{}
+
+ObExprCharLength::~ObExprCharLength()
+{}
+
+int ObExprCharLength::calc_result_type1(ObExprResType& type, ObExprResType& text, ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+
+  int ret = OB_SUCCESS;
+  if (text.is_null()) {
+    type.set_null();
+  } else {
+    if (!is_type_valid(text.get_type())) {
+      ret = OB_INVALID_ARGUMENT_NUM;
+      LOG_WARN("the param is not castable", K(text), K(ret));
+    } else {
+      type.set_int();
+      type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
+      type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
+      text.set_calc_type(ObVarcharType);
+      text.set_calc_collation_type(text.get_collation_type());
+      text.set_calc_collation_level(text.get_collation_level());
+    }
+  }
+  return ret;
+}
+
+int ObExprCharLength::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  ObObjTypeClass type_class = ob_obj_type_class(obj.get_type());
+  if (!ob_is_castable_type_class(type_class)) {
+    result.set_null();
+  } else {
+    TYPE_CHECK(obj, ObVarcharType);
+    size_t length = ObCharset::strlen_char(obj.get_collation_type(), obj.get_string_ptr(), obj.get_string_len());
+    result.set_int(static_cast<int>(length));
+  }
+  UNUSED(expr_ctx);
+  return ret;
+}
+
+int ObExprCharLength::eval_char_length(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* arg = NULL;
+  ObObjTypeClass in_tc = ob_obj_type_class(expr.args_[0]->datum_meta_.type_);
+  if (!ob_is_castable_type_class(in_tc)) {
+    res.set_null();
+  } else if (expr.eval_param_value(ctx, arg)) {
+    LOG_WARN("eval arg failed", K(ret));
+  } else if (arg->is_null()) {
+    res.set_null();
+  } else {
+    const ObString& arg_str = arg->get_string();
+    size_t length = ObCharset::strlen_char(expr.args_[0]->datum_meta_.cs_type_, arg_str.ptr(), arg_str.length());
+    res.set_int(length);
+  }
+  return ret;
+}
+
+int ObExprCharLength::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_ = eval_char_length;
+  return ret;
+}
+}  // namespace sql
+}  // namespace oceanbase