Revert "[Coverage](BE) Delete vinfo_func in BE (#26562)" (#26723)

This reverts commit 01094fd.

be/src/vec/exprs/vexpr.cpp

@@ -41,6 +41,7 @@
 #include "vec/exprs/vectorized_fn_call.h"
 #include "vec/exprs/vexpr_context.h"
 #include "vec/exprs/vin_predicate.h"
+#include "vec/exprs/vinfo_func.h"
 #include "vec/exprs/vlambda_function_call_expr.h"
 #include "vec/exprs/vlambda_function_expr.h"
 #include "vec/exprs/vliteral.h"
@@ -302,6 +303,10 @@ Status VExpr::create_expr(const TExprNode& expr_node, VExprSPtr& expr) {
             expr = VCaseExpr::create_shared(expr_node);
             break;
         }
+        case TExprNodeType::INFO_FUNC: {
+            expr = VInfoFunc::create_shared(expr_node);
+            break;
+        }
         case TExprNodeType::TUPLE_IS_NULL_PRED: {
             expr = VTupleIsNullPredicate::create_shared(expr_node);
             break;

be/src/vec/exprs/vinfo_func.cpp

@@ -0,0 +1,71 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include "vec/exprs/vinfo_func.h"
+
+#include <gen_cpp/Exprs_types.h>
+#include <glog/logging.h>
+#include <stddef.h>
+
+#include <algorithm>
+#include <iostream>
+#include <memory>
+
+#include "runtime/define_primitive_type.h"
+#include "runtime/types.h"
+#include "vec/core/block.h"
+#include "vec/core/field.h"
+#include "vec/core/types.h"
+#include "vec/data_types/data_type.h"
+
+namespace doris {
+namespace vectorized {
+class VExprContext;
+} // namespace vectorized
+} // namespace doris
+
+namespace doris::vectorized {
+
+VInfoFunc::VInfoFunc(const TExprNode& node) : VExpr(node) {
+    Field field;
+    switch (_type.type) {
+    case TYPE_BIGINT: {
+        field = Int64(node.info_func.int_value);
+        break;
+    }
+    case TYPE_STRING:
+    case TYPE_CHAR:
+    case TYPE_VARCHAR: {
+        field = node.info_func.str_value;
+        break;
+    }
+    default: {
+        DCHECK(false) << "Invalid type: " << _type.type;
+        break;
+    }
+    }
+    this->_column_ptr = _data_type->create_column_const(1, field);
+}
+
+Status VInfoFunc::execute(VExprContext* context, vectorized::Block* block, int* result_column_id) {
+    // Info function should return least one row, e.g. select current_user().
+    size_t row_size = std::max(block->rows(), size_t(1));
+    *result_column_id = VExpr::insert_param(block, {_column_ptr, _data_type, _expr_name}, row_size);
+    return Status::OK();
+}
+
+} // namespace doris::vectorized

be/src/vec/exprs/vinfo_func.h

@@ -0,0 +1,50 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#pragma once
+
+#include <string>
+
+#include "common/object_pool.h"
+#include "common/status.h"
+#include "vec/data_types/data_type.h"
+#include "vec/exprs/vexpr.h"
+
+namespace doris {
+class TExprNode;
+
+namespace vectorized {
+class Block;
+class VExprContext;
+
+class VInfoFunc : public VExpr {
+    ENABLE_FACTORY_CREATOR(VInfoFunc);
+
+public:
+    VInfoFunc(const TExprNode& node);
+    ~VInfoFunc() override = default;
+
+    const std::string& expr_name() const override { return _expr_name; }
+    Status execute(VExprContext* context, Block* block, int* result_column_id) override;
+
+private:
+    const std::string _expr_name = "vinfofunc expr";
+    ColumnPtr _column_ptr;
+};
+} // namespace vectorized
+
+} // namespace doris