| // ********************************************************************** |
| // @@@ START COPYRIGHT @@@ |
| // |
| // 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. |
| // |
| // @@@ END COPYRIGHT @@@ |
| // ********************************************************************** |
| |
| #ifndef _QREXPRELEMENT_H_ |
| #define _QREXPRELEMENT_H_ |
| |
| /** |
| * \file |
| * Contains the \c ExprElement enum, which is used in several optimizer header |
| * files for the \c ItemExpr hierarchy. A change to those headers causes a long |
| * compile, so this enum is placed in its own file instead of QRDescriptor.h, |
| * thus avoiding a dependency on that file and a big recompilation whenever |
| * it changes. |
| */ |
| |
| // This is an extension of the QR namespace, some elements of which are also |
| // defined in QRMessage.h. |
| namespace QR |
| { |
| /** |
| * Enumeration representing element types that can appear as subelements in |
| * an <Expr> element. This is used in a virtual function in \c ItemExpr |
| * to indicate what element we should generate when a node of an item |
| * expression is visited. |
| */ |
| enum ExprElement |
| { |
| QRNoElem, |
| QRFunctionElem, |
| QRFunctionWithParameters, |
| QRBinaryOperElem, |
| QRUnaryOperElem, |
| QRColumnElem, |
| QRScalarValueElem |
| }; |
| }; // namespace QR |
| |
| #endif /* _QREXPRELEMENT_H_ */ |
