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src/sql/engine/expr/ob_expr_version.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.
+ */
+
+#include "sql/engine/expr/ob_expr_version.h"
+
+using namespace oceanbase::common;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprVersion::ObExprVersion(ObIAllocator& alloc) : ObStringExprOperator(alloc, T_FUN_SYS_VERSION, N_VERSION, 0)
+{}
+
+ObExprVersion::~ObExprVersion()
+{}
+
+int ObExprVersion::calc_result_type0(ObExprResType& type, ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  type.set_varchar();
+  type.set_length(static_cast<common::ObLength>(strlen(PACKAGE_VERSION)));
+  type.set_default_collation_type();
+  type.set_collation_level(CS_LEVEL_SYSCONST);
+  return OB_SUCCESS;
+}
+
+int ObExprVersion::calc_result0(ObObj& result, ObExprCtx& expr_ctx) const
+{
+  UNUSED(expr_ctx);
+  result.set_varchar(common::ObString(PACKAGE_VERSION));
+  result.set_collation(result_type_);
+  return OB_SUCCESS;
+}
+
+int ObExprVersion::eval_version(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  UNUSED(expr);
+  UNUSED(ctx);
+  expr_datum.set_string(common::ObString(PACKAGE_VERSION));
+  return OB_SUCCESS;
+}
+
+int ObExprVersion::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  UNUSED(raw_expr);
+  UNUSED(op_cg_ctx);
+  rt_expr.eval_func_ = ObExprVersion::eval_version;
+  return OB_SUCCESS;
+}
+
+}  // namespace sql
+}  // namespace oceanbase