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mariadb-columnstore-engine/utils/funcexp/func_case.cpp
david hill f6afc42dd0 the begginning
2016-01-06 14:08:59 -06:00

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/* 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: func_case.cpp 3954 2013-07-08 16:30:15Z bpaul $
*
*
****************************************************************************/
#include <string>
//#define NDEBUG
#include <cassert>
using namespace std;
#include "functor_all.h"
#include "functioncolumn.h"
#include "predicateoperator.h"
using namespace execplan;
#include "rowgroup.h"
using namespace rowgroup;
#include "errorcodes.h"
#include "idberrorinfo.h"
#include "errorids.h"
using namespace logging;
#include "utils_utf8.h"
using namespace funcexp;
namespace
{
using namespace funcexp;
inline uint64_t simple_case_cmp(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType& operationColType)
{
uint64_t i = 0; // index to the parm list
uint64_t n = parm.size() - 1; // remove expression from count of expression_i + result_i
uint64_t hasElse = n % 2; // if 1, then ELSE exist
n -= hasElse; // index to expression
switch (operationColType.colDataType)
{
case execplan::CalpontSystemCatalog::TINYINT:
case execplan::CalpontSystemCatalog::SMALLINT:
case execplan::CalpontSystemCatalog::MEDINT:
case execplan::CalpontSystemCatalog::INT:
case execplan::CalpontSystemCatalog::BIGINT:
case execplan::CalpontSystemCatalog::DATE:
case execplan::CalpontSystemCatalog::DATETIME:
{
int64_t ev = parm[n]->data()->getIntVal(row, isNull);
if (isNull)
break;
for (; i < n; i += 2)
{
if (ev == parm[i]->data()->getIntVal(row, isNull) && !isNull)
break;
else
isNull = false;
}
break;
}
case execplan::CalpontSystemCatalog::UBIGINT:
case execplan::CalpontSystemCatalog::UINT:
case execplan::CalpontSystemCatalog::UMEDINT:
case execplan::CalpontSystemCatalog::UTINYINT:
case execplan::CalpontSystemCatalog::USMALLINT:
{
uint64_t ev = parm[n]->data()->getUintVal(row, isNull);
if (isNull)
break;
for (; i < n; i += 2)
{
if (ev == parm[i]->data()->getUintVal(row, isNull) && !isNull)
break;
else
isNull = false;
}
break;
}
case execplan::CalpontSystemCatalog::CHAR:
case execplan::CalpontSystemCatalog::VARCHAR:
{
const string& ev = parm[n]->data()->getStrVal(row, isNull);
if (isNull)
break;
for (; i < n; i += 2)
{
//BUG 5362
if (utf8::idb_strcoll(ev.c_str(), parm[i]->data()->getStrVal(row, isNull).c_str()) == 0 && !isNull)
break;
else
isNull = false;
}
break;
}
case execplan::CalpontSystemCatalog::DECIMAL:
case execplan::CalpontSystemCatalog::UDECIMAL:
{
IDB_Decimal ev = parm[n]->data()->getDecimalVal(row, isNull);
if (isNull)
break;
for (; i < n; i += 2)
{
if (ev == parm[i]->data()->getDecimalVal(row, isNull) && !isNull)
break;
else
isNull = false;
}
break;
}
case execplan::CalpontSystemCatalog::DOUBLE:
case execplan::CalpontSystemCatalog::UDOUBLE:
{
double ev = parm[n]->data()->getDoubleVal(row, isNull);
if (isNull)
break;
for (; i < n; i += 2)
{
if (ev == parm[i]->data()->getDoubleVal(row, isNull) && !isNull)
break;
else
isNull = false;
}
break;
}
case execplan::CalpontSystemCatalog::FLOAT:
case execplan::CalpontSystemCatalog::UFLOAT:
{
float ev = parm[n]->data()->getFloatVal(row, isNull);
if (isNull)
break;
for (; i < n; i += 2)
{
if (ev == parm[i]->data()->getFloatVal(row, isNull) && !isNull)
break;
else
isNull = false;
}
break;
}
default:
{
std::ostringstream oss;
oss << "case: datatype of " << execplan::colDataTypeToString(operationColType.colDataType);
throw logging::IDBExcept(oss.str(), ERR_DATATYPE_NOT_SUPPORT);
}
}
if (i == n && !hasElse)
isNull = true;
else if (isNull && hasElse)
// BUG 5110. Only way we can exit above with isNull == true is when ev is NULL
// if so and we have else condition we need to use it by setting i = n
{
i = n;
isNull = false;
}
return i;
}
inline uint64_t searched_case_cmp(Row& row,
FunctionParm& parm,
bool& isNull)
{
uint64_t i = 0; // index to the parm list
uint64_t n = parm.size(); // count of boolean_expression_i + result_i
uint64_t hasElse = n % 2; // if 1, then ELSE exist
n -= hasElse; // index to expression
for (; i < n; i += 2)
{
if (parm[i]->getBoolVal(row, isNull))
break;
}
isNull = false;
if (i == n && !hasElse)
isNull = true;
return (i == n ? i-1 : i);
}
CalpontSystemCatalog::ColType caseOperationType(FunctionParm& fp,
CalpontSystemCatalog::ColType& resultType,
bool simpleCase)
{
// ... expression_i + result_i + ... [[expression] + result_N]
FunctionParm::size_type n = fp.size();
if (simpleCase) // simple case has an expression
n -= 1; // remove expression from count of expression_i + result_i
bool hasElse = ((n % 2) != 0); // if 1, then ELSE exist
if (hasElse)
--n; // n now is an even number
idbassert((n % 2) == 0);
bool allStringO = true;
bool allStringR = true;
FunctionParm::size_type l = fp.size() - 1; // last fp index
idbassert(fp[l]->data());
CalpontSystemCatalog::ColType oct = fp[l]->data()->resultType();
CalpontSystemCatalog::ColType rct = resultType;
bool operation = true;
for (uint64_t i = 0; i <= n; i++)
{
// operation or result type
operation = ((i % 2) == 0);
// the result type of ELSE, if exists.
if (i == n)
{
if (!hasElse)
break;
if (simpleCase)
{
// the case expression
if (fp[i]->data()->resultType().colDataType != CalpontSystemCatalog::CHAR &&
fp[i]->data()->resultType().colDataType != CalpontSystemCatalog::VARCHAR)
{
PredicateOperator op;
op.setOpType(oct, fp[i]->data()->resultType());
allStringO = false;
oct = op.operationType();
}
i += 1;
}
operation = false;
}
if (fp[i]->data()->resultType().colDataType != CalpontSystemCatalog::CHAR &&
fp[i]->data()->resultType().colDataType != CalpontSystemCatalog::VARCHAR)
{
// this is not a string column
PredicateOperator op;
if (operation)
{
op.setOpType(oct, fp[i]->data()->resultType());
allStringO = false;
oct = op.operationType();
}
// If any parm is of string type, the result type should be string. (same as if)
else if (rct.colDataType != CalpontSystemCatalog::CHAR &&
rct.colDataType != CalpontSystemCatalog::VARCHAR)
{
op.setOpType(rct, fp[i]->data()->resultType());
allStringR = false;
rct = op.operationType();
}
}
else
{
// this is a string
// If any parm is of string type, the result type should be string. (same as if)
allStringR = true;
}
}
if (allStringO)
{
oct.colDataType = CalpontSystemCatalog::VARCHAR;
oct.colWidth = 255;
}
if (allStringR)
{
rct.colDataType = CalpontSystemCatalog::VARCHAR;
rct.colWidth = 255;
}
if (rct.scale != 0 && rct.colDataType == CalpontSystemCatalog::BIGINT)
rct.colDataType = CalpontSystemCatalog::DECIMAL;
if (oct.scale != 0 && oct.colDataType == CalpontSystemCatalog::BIGINT)
oct.colDataType = CalpontSystemCatalog::DECIMAL;
resultType = rct;
return oct;
}
}
namespace funcexp
{
// simple CASE:
// SELECT CASE ("expression")
// WHEN "condition1" THEN "result1"
// WHEN "condition2" THEN "result2"
// ...
// [ELSE "resultN"]
// END
//
// simple CASE parm order:
// expression1 result1 expression2 result2 ... expression [resultN]
//
CalpontSystemCatalog::ColType Func_simple_case::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
{
return caseOperationType(fp, resultType, true);
}
int64_t Func_simple_case::getIntVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType& operationColType)
{
uint64_t i = simple_case_cmp(row, parm, isNull, operationColType);
if (isNull)
return joblist::BIGINTNULL;
return parm[i+1]->data()->getIntVal(row, isNull);
}
string Func_simple_case::getStrVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType& operationColType)
{
uint64_t i = simple_case_cmp(row, parm, isNull, operationColType);
if (isNull)
return string("");
return parm[i+1]->data()->getStrVal(row, isNull);
}
IDB_Decimal Func_simple_case::getDecimalVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType& operationColType)
{
uint64_t i = simple_case_cmp(row, parm, isNull, operationColType);
if (isNull)
return IDB_Decimal(); // need a null value for IDB_Decimal??
return parm[i+1]->data()->getDecimalVal(row, isNull);
}
double Func_simple_case::getDoubleVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType& operationColType)
{
uint64_t i = simple_case_cmp(row, parm, isNull, operationColType);
if (isNull)
return doubleNullVal();
return parm[i+1]->data()->getDoubleVal(row, isNull);
}
int32_t Func_simple_case::getDateIntVal(rowgroup::Row& row,
FunctionParm& parm,
bool& isNull,
execplan::CalpontSystemCatalog::ColType& op_ct)
{
uint64_t i = simple_case_cmp(row, parm, isNull, op_ct);
if (isNull)
return joblist::DATENULL;
return parm[i+1]->data()->getDateIntVal(row, isNull);
}
int64_t Func_simple_case::getDatetimeIntVal(rowgroup::Row& row,
FunctionParm& parm,
bool& isNull,
execplan::CalpontSystemCatalog::ColType& op_ct)
{
uint64_t i = simple_case_cmp(row, parm, isNull, op_ct);
if (isNull)
return joblist::DATETIMENULL;
return parm[i+1]->data()->getDatetimeIntVal(row, isNull);
}
// searched CASE:
// SELECT CASE
// WHEN "boolean_expression1" THEN "result1"
// WHEN "boolean_expression2" THEN "result2"
// ...
// [ELSE "resultN"]
// END
//
// searched CASE parm order:
// boolean_expression1 result1 boolean_expression2 result2 ... [resultN]
//
CalpontSystemCatalog::ColType Func_searched_case::operationType(FunctionParm& fp, CalpontSystemCatalog::ColType& resultType)
{
// operation type not used by this functor.
// return fp[1]->data()->resultType();
return caseOperationType(fp, resultType, false);
}
int64_t Func_searched_case::getIntVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType&)
{
uint64_t i = searched_case_cmp(row, parm, isNull);
if (isNull)
return joblist::BIGINTNULL;
return parm[i+1]->data()->getIntVal(row, isNull);
}
string Func_searched_case::getStrVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType&)
{
uint64_t i = searched_case_cmp(row, parm, isNull);
if (isNull)
return string("");
return parm[i+1]->data()->getStrVal(row, isNull);
}
IDB_Decimal Func_searched_case::getDecimalVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType&)
{
uint64_t i = searched_case_cmp(row, parm, isNull);
if (isNull)
return IDB_Decimal(); // need a null value for IDB_Decimal??
return parm[i+1]->data()->getDecimalVal(row, isNull);
}
double Func_searched_case::getDoubleVal(Row& row,
FunctionParm& parm,
bool& isNull,
CalpontSystemCatalog::ColType&)
{
uint64_t i = searched_case_cmp(row, parm, isNull);
if (isNull)
return doubleNullVal();
return parm[i+1]->data()->getDoubleVal(row, isNull);
}
int32_t Func_searched_case::getDateIntVal(rowgroup::Row& row,
FunctionParm& parm,
bool& isNull,
execplan::CalpontSystemCatalog::ColType& op_ct)
{
uint64_t i = simple_case_cmp(row, parm, isNull, op_ct);
if (isNull)
return joblist::DATENULL;
return parm[i+1]->data()->getDateIntVal(row, isNull);
}
int64_t Func_searched_case::getDatetimeIntVal(rowgroup::Row& row,
FunctionParm& parm,
bool& isNull,
execplan::CalpontSystemCatalog::ColType& op_ct)
{
uint64_t i = simple_case_cmp(row, parm, isNull, op_ct);
if (isNull)
return joblist::DATETIMENULL;
return parm[i+1]->data()->getDatetimeIntVal(row, isNull);
}
} // namespace funcexp
// vim:ts=4 sw=4:
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