mariadb-columnstore-engine/dbcon/execplan/arithmeticcolumn.cpp

/* Copyright (C) 2014 InfiniDB, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/***********************************************************************
*   $Id: arithmeticcolumn.cpp 9679 2013-07-11 22:32:03Z zzhu $
*
*
***********************************************************************/
#include <string>
#include <exception>
#include <stdexcept>
#include <sstream>
using namespace std;

#include "arithmeticcolumn.h"
#include "constantcolumn.h"
#include "simplecolumn.h"
#include "operator.h"
#include "bytestream.h"
using namespace messageqcpp;

#include "objectreader.h"
#include "expressionparser.h"
#include "calpontselectexecutionplan.h"
#include "treenodeimpl.h"
#include "functioncolumn.h"
#include "aggregatecolumn.h"
#include "windowfunctioncolumn.h"

namespace
{
/** print the tree
 *
 * this function is mostly for debug purpose
 */
void walkfn(const execplan::ParseTree* n, ostream& output)
{
    output << *(n->data()) << endl;
}

}

namespace execplan
{

/**
 *  Constructors/Destructors
 */
ArithmeticColumn::ArithmeticColumn():
    ReturnedColumn(),
    fExpression (0)
{}

ArithmeticColumn::ArithmeticColumn(const string& sql, const uint32_t sessionID):
    ReturnedColumn(sessionID),
    fData(sql),
    fExpression(0)
{
    buildTree();
}

ArithmeticColumn::ArithmeticColumn(const ArithmeticColumn& rhs, const uint32_t sessionID):
    ReturnedColumn(rhs, sessionID),
    fTableAlias (rhs.fTableAlias),
    fAsc (rhs.fAsc),
    fData (rhs.fData),
    fExpression (new ParseTree (*(rhs.expression())))
{
    fAlias = rhs.fAlias;
    fSimpleColumnList.clear();
    fExpression->walk(getSimpleCols, &fSimpleColumnList);
    fAggColumnList.clear();
    fExpression->walk(getAggCols, &fAggColumnList);
    fWindowFunctionColumnList.clear();
    fExpression->walk(getWindowFunctionCols, &fWindowFunctionColumnList);
}

ArithmeticColumn::~ArithmeticColumn()
{
    if (fExpression != NULL)
        delete fExpression;

    fExpression = NULL;
}

/**
 * Methods
 */

void ArithmeticColumn::expression(ParseTree*& expression)
{
    if (fExpression != NULL)
        delete fExpression;

    fExpression = expression;
    expression = 0;
}

void ArithmeticColumn::buildTree()
{
    CalpontSelectExecutionPlan::Parser parser;
    vector<Token> tokens;
    Token t;

    string::size_type i = 0;

    //string fData = ReturnedColumn::data();

    try
    {
        while (fData[i])
        {
            if (isdigit(fData[i]) || fData[i] == '.')
            {
                string num;

                while (isdigit(fData[i]) || fData[i] == '.')
                {
                    num.push_back(fData[i++]);
                }

                ConstantColumn* cc = new ConstantColumn(num, ConstantColumn::NUM);
                t.value = cc;

                tokens.push_back(t);
                continue;
            }
            else if (fData[i] == '+' ||
                     fData[i] == '-' ||
                     fData[i] == '*' ||
                     fData[i] == '/' ||
                     fData[i] == '^' ||
                     fData[i] == '(' ||
                     fData[i] == ')' )
            {
                // t.is_operator now indicate the previous token type
                // if prev token is operand, then this '(' is func_open
                // otherwise, this '(' is open
                if (fData[i] == '(' && fData[i + 1] != '-' && !t.is_operator())
                {
                    // open '('
                    Operator* op1 = new Operator("(");
                    t.value = op1;
                    tokens.push_back(t);

                    //This is not complete... we shouldn't be creating TreeNodes
                    string param = nextToken(++i, ')');

                    TreeNode* tn = new TreeNodeImpl(param);
                    t.value = tn;

                    tokens.push_back(t);

                    // close ')'
                    Operator* op2 = new Operator(")");
                    t.value = op2;
                    tokens.push_back(t);
                    continue;
                }

                string op;

                // Bug 319 fix. recover '^' to '||'
                if (fData[i] == '^')
                    op = "||";
                else
                    op.push_back(fData[i]);

                Operator* oper = new Operator(op);
                t.value = oper;

                tokens.push_back(t);
                ++i;

                // t.is_operator now indicate the previous token type
                // if prev token is operand, then this '(' is func_open
                // otherwise, this '(' is open
                // @bug 241 fix. check (-n_nationkey) case
                if (fData[i] == '(' && fData[i] != '-' && !t.is_operator())
                {
                    //This is not complete... we shouldn't be creating TreeNodes
                    string param = nextToken(++i, ')');
                    TreeNode* sc = new TreeNodeImpl(param);
                    t.value = sc;

                    tokens.push_back(t);

                    // close ')'
                    Operator* oper = new Operator(")");
                    t.value = oper;
                    tokens.push_back(t);
                }

                continue;
            }

            else if (isalpha(fData[i]) || fData[i] == '_' )
            {
                string identifier;

                while (isalnum(fData[i]) ||
                        fData[i] == '_' ||
                        fData[i] == '.' )
                {
                    identifier.push_back(fData[i++]);
                }

                SimpleColumn* sc = new SimpleColumn(identifier, fSessionID );
                t.value = sc;

                tokens.push_back(t);
                continue;
            }

            else if (fData[i] == '\'')
            {
                string literal = nextToken(++i, '\'');
                ConstantColumn* cc = new ConstantColumn (literal, ConstantColumn::LITERAL);
                t.value = cc;

                tokens.push_back(t);
                continue;
            }

            ++i;
        }

        fExpression = parser.parse(tokens.begin(), tokens.end());
    }
    catch (const invalid_argument& e)
    {
        // clean up tokens
        for (unsigned int i = 0; i < tokens.size(); i++)
        {
            delete tokens[i].value;
            tokens[i].value = 0;
        }

        throw runtime_error(e.what());
    }
}

const string ArithmeticColumn::nextToken(string::size_type& pos, char end) const
{
    string token;
    // string fData = ReturnedColumn::data();

    // increment num when get '(' and decrement when get ')'
    // to find the mathing ')' when num = 0
    int num = 1;

    for (; pos < fData.length(); )
    {
        if (end == ')')
        {
            if (fData[pos] == '(')
                num++;
            else if (fData[pos] == ')')
                num--;

            if (num == 0)
            {
                pos++;
                return token;
            }
        }
        else
        {
            if (fData[pos] == end)
            {
                pos++;
                return token;
            }
        }

        token.push_back(fData[pos++]);
    }

    string msg = "No ";
    msg.append(1, end);
    msg.append(" found in " + fData);
    throw invalid_argument ( msg );
    return 0;
}

ostream& operator<<(ostream& output, const ArithmeticColumn& rhs)
{
    output << rhs.toString();
    return output;
}

const string ArithmeticColumn::toString() const
{
    ostringstream oss;
    oss << "ArithmeticColumn: ";

    if (fAlias.length() > 0) oss << "Alias: " << fAlias << endl;

    if (fExpression != 0) fExpression->walk(walkfn, oss);

    oss << "expressionId=" << fExpressionId << endl;
    oss << "joinInfo=" << fJoinInfo << " returnAll=" << fReturnAll << " sequence#=" << fSequence << endl;
    oss << "resultType=" << colDataTypeToString(fResultType.colDataType) << "|" << fResultType.colWidth <<
        endl;
    return oss.str();
}

void ArithmeticColumn::serialize(messageqcpp::ByteStream& b) const
{
    b << static_cast<ObjectReader::id_t>(ObjectReader::ARITHMETICCOLUMN);
    ReturnedColumn::serialize(b);
    ObjectReader::writeParseTree(fExpression, b);
    b << fTableAlias;
    b << fData;
    b << static_cast<const ByteStream::doublebyte>(fAsc);
}

void ArithmeticColumn::unserialize(messageqcpp::ByteStream& b)
{
    ObjectReader::checkType(b, ObjectReader::ARITHMETICCOLUMN);
    ReturnedColumn::unserialize(b);

    if (fExpression != NULL)
        delete fExpression;

    fExpression = ObjectReader::createParseTree(b);
    b >> fTableAlias;
    b >> fData;
    b >> reinterpret_cast< ByteStream::doublebyte&>(fAsc);

    fSimpleColumnList.clear();
    fExpression->walk(getSimpleCols, &fSimpleColumnList);
    fAggColumnList.clear();
    fExpression->walk(getAggCols, &fAggColumnList);
    fWindowFunctionColumnList.clear();
    fExpression->walk(getWindowFunctionCols, &fWindowFunctionColumnList);
}

bool ArithmeticColumn::operator==(const ArithmeticColumn& t) const
{
    const ReturnedColumn* rc1, *rc2;

    rc1 = static_cast<const ReturnedColumn*>(this);
    rc2 = static_cast<const ReturnedColumn*>(&t);

    if (*rc1 != *rc2)
        return false;

    if (fExpression != NULL && t.fExpression != NULL)
    {
        if (*fExpression != *t.fExpression)
            return false;
    }
    else if (fExpression != NULL || t.fExpression != NULL)
        return false;

    if (fAlias != t.fAlias)
        return false;

    if (fTableAlias != t.fTableAlias)
        return false;

    if (fData != t.fData)
        return false;

    return true;
}

bool ArithmeticColumn::operator==(const TreeNode* t) const
{
    const ArithmeticColumn* o;

    o = dynamic_cast<const ArithmeticColumn*>(t);

    if (o == NULL)
        return false;

    return *this == *o;
}

bool ArithmeticColumn::operator!=(const ArithmeticColumn& t) const
{
    return (!(*this == t));
}

bool ArithmeticColumn::operator!=(const TreeNode* t) const
{
    return (!(*this == t));
}

bool ArithmeticColumn::hasAggregate()
{
    if (fHasAggregate) return true;

    fAggColumnList.clear();
    fExpression->walk(getAggCols, &fAggColumnList);

    if (!fAggColumnList.empty())
        fHasAggregate = true;

    return fHasAggregate;
}

bool ArithmeticColumn::hasWindowFunc()
{
    fWindowFunctionColumnList.clear();
    fExpression->walk(getWindowFunctionCols, &fWindowFunctionColumnList);

    if (fWindowFunctionColumnList.empty())
        return false;

    return true;
}

void ArithmeticColumn::setDerivedTable()
{
    if (hasAggregate())
    {
        fDerivedTable = "";
        return;
    }

    if (fExpression)
    {
        fExpression->setDerivedTable();
        fDerivedTable = fExpression->derivedTable();
    }
}

void ArithmeticColumn::replaceRealCol(std::vector<SRCP>& derivedColList)
{
    if (fExpression)
        replaceRefCol(fExpression, derivedColList);
}

void ArithmeticColumn::setSimpleColumnList()
{
    fSimpleColumnList.clear();
    fExpression->walk(getSimpleCols, &fSimpleColumnList);
}

bool ArithmeticColumn::singleTable(CalpontSystemCatalog::TableAliasName& tan)
{
    tan.clear();
    setSimpleColumnList();

    for (uint32_t i = 0; i < fSimpleColumnList.size(); i++)
    {
        CalpontSystemCatalog::TableAliasName stan(fSimpleColumnList[i]->schemaName(),
                fSimpleColumnList[i]->tableName(),
                fSimpleColumnList[i]->tableAlias(),
                fSimpleColumnList[i]->viewName());

        if (tan.table.empty())
            tan = stan;
        else if (stan != tan)
            return false;
    }

    return true;
}

} // namespace