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105 lines
3.0 KiB
C++
105 lines
3.0 KiB
C++
/* 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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* $Id: func_insert.cpp 2477 2011-04-01 16:07:35Z rdempsey $
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*
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*
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****************************************************************************/
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#include <string>
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using namespace std;
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#include "functor_str.h"
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#include "functioncolumn.h"
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using namespace execplan;
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#include "rowgroup.h"
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using namespace rowgroup;
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#include "joblisttypes.h"
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using namespace joblist;
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#include "utf8.h"
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using namespace utf8;
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namespace funcexp
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{
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CalpontSystemCatalog::ColType Func_insert::operationType(FunctionParm& fp,
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CalpontSystemCatalog::ColType& /*resultType*/)
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{
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// operation type is not used by this functor
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return fp[0]->data()->resultType();
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}
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std::string Func_insert::getStrVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
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execplan::CalpontSystemCatalog::ColType&)
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{
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string src;
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string tnewstr;
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int64_t start, length;
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stringValue(fp[0], row, isNull, src);
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if (isNull)
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return "";
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stringValue(fp[3], row, isNull, tnewstr);
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if (isNull)
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return "";
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start = fp[1]->data()->getIntVal(row, isNull);
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if (isNull)
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return "";
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start--; // Because SQL syntax is 1 based and we want 0 based.
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length = fp[2]->data()->getIntVal(row, isNull);
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if (isNull)
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return "";
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CHARSET_INFO* cs = fp[0]->data()->resultType().getCharset();
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// binLen represents the number of bytes
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int64_t binLen = static_cast<int64_t>(src.length());
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const char* pos = src.c_str();
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const char* end = pos + binLen;
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// strLen is number of characters
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int64_t strLen = cs->numchars(pos, end);
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// Return the original string if start isn't within the string.
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if ((start < 0) || start >= strLen)
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return src;
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if ((length < 0) || (length > strLen))
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length = strLen;
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// Convert start and length from characters to bytes.
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start = cs->charpos(pos, end, start);
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length = cs->charpos(pos + start, end, length);
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string out;
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out.reserve(binLen - length + tnewstr.length() + 1);
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out.append(src.c_str(), start);
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out.append(tnewstr.c_str(), tnewstr.length());
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if (binLen - start - length > 0)
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out.append(src.c_str() + start + length, binLen - start - length);
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return out;
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}
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} // namespace funcexp
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