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src/sql/engine/expr/ob_expr_lnnvl.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 <string.h>
+#include "sql/parser/ob_item_type.h"
+#include "sql/engine/expr/ob_expr_lnnvl.h"
+#include "share/object/ob_obj_cast.h"
+//#include "sql/engine/expr/ob_expr_promotion_util.h"
+
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+
+namespace oceanbase {
+namespace sql {}
+}  // namespace oceanbase
+
+ObExprFuncLnnvl::ObExprFuncLnnvl(ObIAllocator& alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_LNNVL, N_LNNVL, 1, NOT_ROW_DIMENSION)
+{}
+
+ObExprFuncLnnvl::~ObExprFuncLnnvl()
+{}
+
+int ObExprFuncLnnvl::calc_result1(ObObj& result, const ObObj& input, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (OB_UNLIKELY(NULL == expr_ctx.calc_buf_)) {
+    _OB_LOG(WARN, "varchar buffer not init");
+    ret = OB_NOT_INIT;
+  } else if (input.is_null()) {
+    result.set_bool(true);
+  } else {
+    TYPE_CHECK(input, ObTinyIntType);
+    int8_t tinyint_val = input.get_tinyint();
+    if (tinyint_val == 0) {
+      result.set_bool(true);
+    } else {
+      result.set_bool(false);
+    }
+  }
+  return ret;
+}
+
+int ObExprFuncLnnvl::cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  CK(1 == rt_expr.arg_cnt_);
+  rt_expr.eval_func_ = eval_lnnvl;
+  return ret;
+}
+
+int ObExprFuncLnnvl::eval_lnnvl(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* arg = NULL;
+  if (OB_FAIL(expr.eval_param_value(ctx, arg))) {
+    LOG_WARN("evaluate parameters failed", K(ret));
+  } else if (arg->is_null()) {
+    expr_datum.set_bool(true);
+  } else {
+    expr_datum.set_bool(!arg->get_tinyint());
+  }
+  return ret;
+}