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93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
/*
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Copyright (c) 2017, MariaDB
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Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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*/
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#pragma once
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#include <string>
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#include <iosfwd>
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#include <vector>
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#include "returnedcolumn.h"
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/**
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* Namespace
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*/
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namespace execplan
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{
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// This enum is made consistant with mysql Item_window_func
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enum WF_FRAME
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{
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WF_PRECEDING = 0,
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WF_FOLLOWING,
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WF_UNBOUNDED_PRECEDING,
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WF_UNBOUNDED_FOLLOWING,
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WF_CURRENT_ROW,
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WF_UNKNOWN
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};
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struct WF_Boundary
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{
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WF_Boundary() = default;
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explicit WF_Boundary(WF_FRAME frame) : fFrame(frame)
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{
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}
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~WF_Boundary() = default;
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const std::string toString() const;
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void serialize(messageqcpp::ByteStream&) const;
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void unserialize(messageqcpp::ByteStream&);
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SRCP fVal; /// has to evaluate to unsigned value
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SRCP fBound; /// order by col +, -, date_add or date_sub for RANGE window
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enum WF_FRAME fFrame;
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};
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struct WF_Frame
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{
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WF_Frame() : fIsRange(true)
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{
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fStart.fFrame = WF_UNBOUNDED_PRECEDING;
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fEnd.fFrame = WF_UNBOUNDED_FOLLOWING;
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}
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~WF_Frame() = default;
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const std::string toString() const;
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void serialize(messageqcpp::ByteStream&) const;
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void unserialize(messageqcpp::ByteStream&);
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WF_Boundary fStart;
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WF_Boundary fEnd;
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bool fIsRange; /// RANGE or ROWS
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};
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/**
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* @brief A class to represent the order by clause of window function
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*/
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struct WF_OrderBy
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{
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WF_OrderBy() = default;
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explicit WF_OrderBy(std::vector<SRCP> orders) : fOrders(orders)
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{
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}
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~WF_OrderBy() = default;
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const std::string toString() const;
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void serialize(messageqcpp::ByteStream&) const;
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void unserialize(messageqcpp::ByteStream&);
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std::vector<SRCP> fOrders;
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WF_Frame fFrame;
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};
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} // namespace execplan
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