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mariadb-columnstore-engine/dbcon/mysql/ha_mcs_execplan_walks.cpp

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/* Copyright (C) 2025 MariaDB Corporation
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. */
#include "ha_mcs_execplan_helpers.h"
#include "ha_mcs_execplan_parseinfo_bits.h"
#include "ha_mcs_execplan_walks.h"
#include "ha_mcs_impl_if.h"
#include "ha_subquery.h"
#include "constantcolumn.h"
#include "logicoperator.h"
#include "rowcolumn.h"
#include "simplefilter.h"
namespace cal_impl_if
{
// In certain cases, gp_walk is called recursively. When done so,
// we need to bookmark the rcWorkStack for those cases where a constant
// expression such as 1=1 is used in an if statement or function call.
// This is a seriously bad kludge for MariaDB bug 750.
//
// BM => BookMark
// HWM => HighWaterMark
class RecursionCounter
{
private:
RecursionCounter()
{
}
public:
RecursionCounter(cal_impl_if::gp_walk_info* gwip) : fgwip(gwip)
{
++fgwip->recursionLevel;
if (fgwip->recursionLevel > fgwip->recursionHWM)
{
fgwip->rcBookMarkStack.push(fgwip->rcWorkStack.size());
fgwip->recursionHWM = fgwip->recursionLevel;
}
}
~RecursionCounter()
{
--fgwip->recursionLevel;
if (fgwip->recursionLevel < fgwip->recursionHWM - 1)
{
fgwip->rcBookMarkStack.pop();
--fgwip->recursionHWM;
}
}
cal_impl_if::gp_walk_info* fgwip;
};
bool isSecondArgumentConstItem(Item_func* ifp)
{
return (ifp->argument_count() == 2 && ifp->arguments()[1]->type() == Item::CONST_ITEM);
}
// SELECT ... WHERE <col> NOT IN (SELECT <const_item>);
bool isNotFuncAndConstScalarSubSelect(Item_func* ifp, const std::string& funcName)
{
return (ifp->with_subquery() && funcName == "not" && ifp->argument_count() == 1 &&
ifp->arguments()[0]->type() == Item::FUNC_ITEM &&
std::string(((Item_func*)ifp->arguments()[0])->func_name()) == "=" &&
isSecondArgumentConstItem((Item_func*)ifp->arguments()[0]));
}
void gp_walk(const Item* item, void* arg)
{
cal_impl_if::gp_walk_info* gwip = static_cast<cal_impl_if::gp_walk_info*>(arg);
idbassert(gwip);
// Bailout...
if (gwip->fatalParseError)
return;
RecursionCounter r(gwip); // Increments and auto-decrements upon exit.
Item::Type itype = item->type();
// Allow to process XOR(which is Item_func) like other logical operators (which are Item_cond)
if (itype == Item::FUNC_ITEM && ((Item_func*)item)->functype() == Item_func::XOR_FUNC)
itype = Item::COND_ITEM;
switch (itype)
{
case Item::CACHE_ITEM:
{
// The item or condition is cached as per MariaDB server view but
// for InfiniDB it need to be parsed and executed.
// MCOL-1188 and MCOL-1029
Item* orig_item = ((Item_cache*)item)->get_example();
orig_item->traverse_cond(gp_walk, gwip, Item::POSTFIX);
break;
}
case Item::FIELD_ITEM:
{
Item_field* ifp = (Item_field*)item;
if (ifp)
{
// XXX: this looks awfuly wrong.
execplan::SimpleColumn* scp = buildSimpleColumn(ifp, *gwip);
if (!scp)
break;
string aliasTableName(scp->tableAlias());
scp->tableAlias(aliasTableName);
gwip->rcWorkStack.push(scp->clone());
boost::shared_ptr<execplan::SimpleColumn> scsp(scp);
gwip->scsp = scsp;
gwip->funcName.clear();
gwip->columnMap.insert(
execplan::CalpontSelectExecutionPlan::ColumnMap::value_type(string(ifp->field_name.str), scsp));
//@bug4636 take where clause column as dummy projection column, but only on local column.
// varbinary aggregate is not supported yet, so rule it out
if (!((scp->joinInfo() & execplan::JOIN_CORRELATED) ||
scp->colType().colDataType == execplan::CalpontSystemCatalog::VARBINARY))
{
TABLE_LIST* tmp = (ifp->cached_table ? ifp->cached_table : 0);
gwip->tableMap[execplan::make_aliastable(scp->schemaName(), scp->tableName(), scp->tableAlias(),
scp->isColumnStore())] = make_pair(1, tmp);
}
}
break;
}
case Item::CONST_ITEM:
{
switch (item->cmp_type())
{
case INT_RESULT:
{
Item* non_const_item = const_cast<Item*>(item);
gwip->rcWorkStack.push(buildReturnedColumn(non_const_item, *gwip, gwip->fatalParseError));
break;
}
case STRING_RESULT:
{
// Special handling for 0xHHHH literals
if (item->type_handler() == &type_handler_hex_hybrid)
{
Item_hex_hybrid* hip = static_cast<Item_hex_hybrid*>(const_cast<Item*>(item));
gwip->rcWorkStack.push(new execplan::ConstantColumn((int64_t)hip->val_int(), execplan::ConstantColumn::NUM));
execplan::ConstantColumn* cc = dynamic_cast<execplan::ConstantColumn*>(gwip->rcWorkStack.top());
cc->timeZone(gwip->timeZone);
break;
}
if (item->result_type() == STRING_RESULT)
{
// dangerous cast here
Item* isp = const_cast<Item*>(item);
String val, *str = isp->val_str(&val);
if (str)
{
string cval;
if (str->ptr())
{
cval.assign(str->ptr(), str->length());
}
gwip->rcWorkStack.push(new execplan::ConstantColumn(cval));
(dynamic_cast<execplan::ConstantColumn*>(gwip->rcWorkStack.top()))->timeZone(gwip->timeZone);
break;
}
else
{
gwip->rcWorkStack.push(new execplan::ConstantColumn("", execplan::ConstantColumn::NULLDATA));
(dynamic_cast<execplan::ConstantColumn*>(gwip->rcWorkStack.top()))->timeZone(gwip->timeZone);
break;
}
gwip->rcWorkStack.push(buildReturnedColumn(isp, *gwip, gwip->fatalParseError));
}
break;
}
case REAL_RESULT:
case DECIMAL_RESULT:
case TIME_RESULT:
{
Item* nonConstItem = const_cast<Item*>(item);
gwip->rcWorkStack.push(buildReturnedColumn(nonConstItem, *gwip, gwip->fatalParseError));
break;
}
default:
{
if (gwip->condPush)
{
// push noop for unhandled item
execplan::SimpleColumn* rc = new execplan::SimpleColumn("noop");
rc->timeZone(gwip->timeZone);
gwip->rcWorkStack.push(rc);
break;
}
ostringstream oss;
oss << "Unhandled Item type(): " << item->type();
gwip->parseErrorText = oss.str();
gwip->fatalParseError = true;
break;
}
}
break;
}
case Item::NULL_ITEM:
{
if (gwip->condPush)
{
// push noop for unhandled item
execplan::SimpleColumn* rc = new execplan::SimpleColumn("noop");
rc->timeZone(gwip->timeZone);
gwip->rcWorkStack.push(rc);
break;
}
gwip->rcWorkStack.push(new execplan::ConstantColumn("", execplan::ConstantColumn::NULLDATA));
(dynamic_cast<execplan::ConstantColumn*>(gwip->rcWorkStack.top()))->timeZone(gwip->timeZone);
break;
}
case Item::FUNC_ITEM:
{
Item* ncitem = const_cast<Item*>(item);
Item_func* ifp = static_cast<Item_func*>(ncitem);
string funcName = ifp->func_name();
if (!gwip->condPush)
{
if (!ifp->fixed())
{
ifp->fix_fields(gwip->thd, &ncitem);
}
// Special handling for queries of the form:
// SELECT ... WHERE col1 NOT IN (SELECT <const_item>);
if (isNotFuncAndConstScalarSubSelect(ifp, funcName))
{
idbassert(!gwip->ptWorkStack.empty());
execplan::ParseTree* pt = gwip->ptWorkStack.top();
execplan::SimpleFilter* sf = dynamic_cast<execplan::SimpleFilter*>(pt->data());
if (sf)
{
boost::shared_ptr<execplan::Operator> sop(new execplan::PredicateOperator("<>"));
sf->op(sop);
return;
}
}
// Do not call buildSubselectFunc() if the subquery is a const scalar
// subselect of the form:
// (SELECT <const_item>)
// As an example: SELECT col1 FROM t1 WHERE col2 = (SELECT 2);
if ((ifp->with_subquery() && !isSecondArgumentConstItem(ifp)) || funcName == "<in_optimizer>")
{
buildSubselectFunc(ifp, gwip);
return;
}
if (ifp->argument_count() > 0 && ifp->arguments())
{
for (uint32_t i = 0; i < ifp->argument_count(); i++)
{
if (ifp->arguments()[i]->type() == Item::SUBSELECT_ITEM)
{
// This is probably NOT IN subquery with derived table in it.
// for some reason, MySQL has not fully optimized the plan at this point.
// noop here, and eventually MySQL will continue its optimization and get
// to rnd_init again.
if (ifp->functype() == Item_func::NOT_FUNC)
return;
buildSubselectFunc(ifp, gwip);
return;
}
}
}
if (ifp->functype() == Item_func::TRIG_COND_FUNC && gwip->subQuery)
{
gwip->subQuery->handleFunc(gwip, ifp);
break;
}
// having clause null function added by MySQL
if (ifp->functype() == Item_func::ISNOTNULLTEST_FUNC)
{
// @bug 4215. remove the argument in rcWorkStack.
if (!gwip->rcWorkStack.empty())
{
delete gwip->rcWorkStack.top();
gwip->rcWorkStack.pop();
}
break;
}
}
// try to evaluate const F&E
vector<Item_field*> tmpVec;
uint16_t parseInfo = 0;
parse_item(ifp, tmpVec, gwip->fatalParseError, parseInfo, gwip);
// table mode takes only one table filter
if (gwip->condPush)
{
set<string> tableSet;
for (uint32_t i = 0; i < tmpVec.size(); i++)
{
if (tmpVec[i]->table_name.str)
tableSet.insert(tmpVec[i]->table_name.str);
}
if (tableSet.size() > 1)
break;
}
if (!gwip->fatalParseError && !(parseInfo & AGG_BIT) && !(parseInfo & SUB_BIT) && !nonConstFunc(ifp) &&
!(parseInfo & AF_BIT) && tmpVec.size() == 0 && ifp->functype() != Item_func::MULT_EQUAL_FUNC)
{
ValStrStdString valStr(ifp);
execplan::ConstantColumn* cc = buildConstantColumnMaybeNullFromValStr(ifp, valStr, *gwip);
for (uint32_t i = 0; i < ifp->argument_count() && !gwip->rcWorkStack.empty(); i++)
{
delete gwip->rcWorkStack.top();
gwip->rcWorkStack.pop();
}
// bug 3137. If filter constant like 1=0, put it to ptWorkStack
// MariaDB bug 750. Breaks if compare is an argument to a function.
// if ((int32_t)gwip->rcWorkStack.size() <=
//(gwip->rcBookMarkStack.empty()
//?
// 0
//: gwip->rcBookMarkStack.top())
// && isPredicateFunction(ifp, gwip))
if (isPredicateFunction(ifp, gwip))
gwip->ptWorkStack.push(new execplan::ParseTree(cc));
else
gwip->rcWorkStack.push(cc);
if (!valStr.isNull())
IDEBUG(cerr << "Const F&E " << item->full_name() << " evaluate: " << valStr << endl);
break;
}
execplan::ReturnedColumn* rc = NULL;
// @bug4488. Process function for table mode also, not just vtable mode.
rc = buildFunctionColumn(ifp, *gwip, gwip->fatalParseError);
if (gwip->fatalParseError)
{
if (gwip->clauseType == SELECT)
return;
// @bug 2585
if (gwip->parseErrorText.empty())
{
logging::Message::Args args;
args.add(funcName);
gwip->parseErrorText = logging::IDBErrorInfo::instance()->errorMsg(logging::ERR_NON_SUPPORTED_FUNCTION, args);
}
return;
}
// predicate operators fall in the old path
if (rc)
{
// @bug 2383. For some reason func_name() for "in" gives " IN " always
if (funcName == "between" || funcName == "in" || funcName == " IN ")
gwip->ptWorkStack.push(new execplan::ParseTree(rc));
else
gwip->rcWorkStack.push(rc);
}
else
{
// push to pt or rc stack is handled inside the function
buildPredicateItem(ifp, gwip);
}
break;
}
case Item::SUM_FUNC_ITEM:
{
Item_sum* isp = (Item_sum*)item;
execplan::ReturnedColumn* rc = buildAggregateColumn(isp, *gwip);
if (rc)
gwip->rcWorkStack.push(rc);
break;
}
case Item::COND_ITEM:
{
// All logical functions are handled here, most of them are Item_cond,
// but XOR (it is Item_func_boolean2)
Item_func* func = (Item_func*)item;
enum Item_func::Functype ftype = func->functype();
bool isOr = (ftype == Item_func::COND_OR_FUNC);
bool isXor = (ftype == Item_func::XOR_FUNC);
List<Item>* argumentList;
List<Item> xorArgumentList;
if (isXor)
{
for (unsigned i = 0; i < func->argument_count(); i++)
{
xorArgumentList.push_back(func->arguments()[i]);
}
argumentList = &xorArgumentList;
}
else
{
argumentList = ((Item_cond*)item)->argument_list();
}
// @bug2932. if ptWorkStack contains less items than the condition's arguments,
// the missing one should be in the rcWorkStack, unless the it's subselect.
// @todo need to figure out a way to combine these two stacks while walking.
// if (gwip->ptWorkStack.size() < icp->argument_list()->elements)
{
List_iterator_fast<Item> li(*argumentList);
while (Item* it = li++)
{
//@bug3495, @bug5865 error out non-supported OR with correlated subquery
if (isOr)
{
vector<Item_field*> fieldVec;
uint16_t parseInfo = 0;
parse_item(it, fieldVec, gwip->fatalParseError, parseInfo, gwip);
if (parseInfo & CORRELATED)
{
gwip->fatalParseError = true;
gwip->parseErrorText = logging::IDBErrorInfo::instance()->errorMsg(logging::ERR_CORRELATED_SUB_OR);
return;
}
}
if ((it->type() == Item::FIELD_ITEM ||
(it->type() == Item::CONST_ITEM &&
(it->cmp_type() == INT_RESULT || it->cmp_type() == DECIMAL_RESULT ||
it->cmp_type() == STRING_RESULT || it->cmp_type() == REAL_RESULT)) ||
it->type() == Item::NULL_ITEM ||
(it->type() == Item::FUNC_ITEM && !isPredicateFunction(it, gwip))) &&
!gwip->rcWorkStack.empty())
{
gwip->ptWorkStack.push(new execplan::ParseTree(gwip->rcWorkStack.top()));
gwip->rcWorkStack.pop();
}
}
}
// @bug1603. MySQL's filter tree is a multi-tree grouped by operator. So more than
// two filters saved on the stack so far might belong to this operator.
uint32_t leftInStack = gwip->ptWorkStack.size() - argumentList->elements + 1;
while (true)
{
if (gwip->ptWorkStack.size() < 2)
break;
execplan::ParseTree* lhs = gwip->ptWorkStack.top();
gwip->ptWorkStack.pop();
execplan::SimpleFilter* lsf = dynamic_cast<execplan::SimpleFilter*>(lhs->data());
if (lsf && lsf->op()->data() == "noop")
{
if (isOr)
{
gwip->parseErrorText = "Unhandled item in WHERE or HAVING clause";
gwip->fatalParseError = true;
break;
}
else
continue;
}
execplan::ParseTree* rhs = gwip->ptWorkStack.top();
gwip->ptWorkStack.pop();
execplan::SimpleFilter* rsf = dynamic_cast<execplan::SimpleFilter*>(rhs->data());
if (rsf && rsf->op()->data() == "noop")
{
if (isOr)
{
gwip->parseErrorText = "Unhandled item in WHERE or HAVING clause";
gwip->fatalParseError = true;
break;
}
else
{
delete rhs;
gwip->ptWorkStack.push(lhs);
continue;
}
}
execplan::Operator* op = new execplan::LogicOperator(func->func_name());
execplan::ParseTree* ptp = new execplan::ParseTree(op);
ptp->left(lhs);
ptp->right(rhs);
gwip->ptWorkStack.push(ptp);
if (gwip->ptWorkStack.size() == leftInStack)
break;
}
// special handling for subquery with aggregate. MySQL adds isnull function to the selected
// column. InfiniDB will remove it and set nullmatch flag if it's NOT_IN sub.
// @todo need more checking here to make sure it's not a user input OR operator
if (isOr && gwip->subQuery)
gwip->subQuery->handleFunc(gwip, func);
break;
}
case Item::REF_ITEM:
{
Item* col = *(((Item_ref*)item)->ref);
execplan::ReturnedColumn* rc = NULL;
// ref item is not pre-walked. force clause type to SELECT
ClauseType clauseType = gwip->clauseType;
gwip->clauseType = SELECT;
if (col->type() != Item::COND_ITEM)
{
rc = buildReturnedColumn(col, *gwip, gwip->fatalParseError, true);
if (col->type() == Item::FIELD_ITEM)
gwip->fatalParseError = false;
}
execplan::SimpleColumn* sc = clauseType == HAVING ? nullptr : dynamic_cast<execplan::SimpleColumn*>(rc);
if (sc)
{
boost::shared_ptr<execplan::SimpleColumn> scsp(sc->clone());
gwip->scsp = scsp;
if (col->type() == Item::FIELD_ITEM)
{
const Item_ident* ident_field = dynamic_cast<const Item_ident*>(item);
if (ident_field)
{
const auto& field_name = string(ident_field->field_name.str);
auto colMap = execplan::CalpontSelectExecutionPlan::ColumnMap::value_type(field_name, scsp);
gwip->columnMap.insert(colMap);
}
}
}
bool cando = true;
gwip->clauseType = clauseType;
if (rc)
{
if (((Item_ref*)item)->depended_from)
{
rc->joinInfo(rc->joinInfo() | execplan::JOIN_CORRELATED);
if (gwip->subQuery)
gwip->subQuery->correlated(true);
execplan::SimpleColumn* scp = dynamic_cast<execplan::SimpleColumn*>(rc);
if (scp)
gwip->correlatedTbNameVec.push_back(
execplan::make_aliastable(scp->schemaName(), scp->tableName(), scp->tableAlias()));
if (gwip->subSelectType == execplan::CalpontSelectExecutionPlan::SINGLEROW_SUBS)
rc->joinInfo(rc->joinInfo() | execplan::JOIN_SCALAR | execplan::JOIN_SEMI);
if (gwip->subSelectType == execplan::CalpontSelectExecutionPlan::SELECT_SUBS)
rc->joinInfo(rc->joinInfo() | execplan::JOIN_SCALAR | execplan::JOIN_OUTER_SELECT);
}
gwip->rcWorkStack.push(rc);
}
else if (col->type() == Item::FUNC_ITEM)
{
// sometimes mysql treat having filter items inconsistently. In such cases,
// which are always predicate operator, the function (gp_key>3) comes in as
// one item.
Item_func* ifp = (Item_func*)col;
for (uint32_t i = 0; i < ifp->argument_count(); i++)
{
execplan::ReturnedColumn* operand = NULL;
if (ifp->arguments()[i]->type() == Item::REF_ITEM)
{
Item* op = *(((Item_ref*)ifp->arguments()[i])->ref);
operand = buildReturnedColumn(op, *gwip, gwip->fatalParseError);
}
else
operand = buildReturnedColumn(ifp->arguments()[i], *gwip, gwip->fatalParseError);
if (operand)
{
gwip->rcWorkStack.push(operand);
if (i == 0 && gwip->scsp == NULL) // first item is the WHEN LHS
{
execplan::SimpleColumn* sc = dynamic_cast<execplan::SimpleColumn*>(operand);
if (sc)
{
gwip->scsp.reset(sc->clone()); // We need to clone else sc gets double deleted. This code is
// rarely executed so the cost is acceptable.
}
}
}
else
{
cando = false;
break;
}
}
if (cando)
buildPredicateItem(ifp, gwip);
}
else if (col->type() == Item::COND_ITEM)
{
gwip->ptWorkStack.push(buildParseTree(col, *gwip, gwip->fatalParseError));
}
else if (col->type() == Item::FIELD_ITEM && gwip->clauseType == HAVING)
{
// ReturnedColumn* rc = buildAggFrmTempField(const_cast<Item*>(item), *gwip);
execplan::ReturnedColumn* rc = buildReturnedColumn(const_cast<Item*>(item), *gwip, gwip->fatalParseError);
if (rc)
gwip->rcWorkStack.push(rc);
break;
}
else
{
cando = false;
}
execplan::SimpleColumn* thisSC = dynamic_cast<execplan::SimpleColumn*>(rc);
if (thisSC)
{
gwip->scsp.reset(thisSC->clone());
}
if (!rc && !cando)
{
ostringstream oss;
oss << "Unhandled Item type(): " << item->type();
gwip->parseErrorText = oss.str();
gwip->fatalParseError = true;
}
break;
}
case Item::SUBSELECT_ITEM:
{
if (gwip->condPush) // table mode
break;
Item_subselect* sub = (Item_subselect*)item;
if (sub->substype() == Item_subselect::EXISTS_SUBS)
{
SubQuery* orig = gwip->subQuery;
ExistsSub* existsSub = new ExistsSub(*gwip, sub);
gwip->hasSubSelect = true;
gwip->subQuery = existsSub;
gwip->ptWorkStack.push(existsSub->transform());
// recover original
gwip->subQuery = orig;
gwip->lastSub = existsSub;
}
else if (sub->substype() == Item_subselect::IN_SUBS)
{
if (!((Item_in_subselect*)sub)->optimizer && gwip->thd->derived_tables_processing)
{
ostringstream oss;
oss << "Invalid In_optimizer: " << item->type();
gwip->parseErrorText = oss.str();
gwip->fatalParseError = true;
break;
}
}
// store a dummy subselect object. the transform is handled in item_func.
execplan::SubSelect* subselect = new execplan::SubSelect();
gwip->rcWorkStack.push(subselect);
break;
}
case Item::ROW_ITEM:
{
Item_row* row = (Item_row*)item;
execplan::RowColumn* rowCol = new execplan::RowColumn();
vector<execplan::SRCP> cols;
// temp change clause type because the elements of row column are not walked yet
gwip->clauseType = SELECT;
for (uint32_t i = 0; i < row->cols(); i++)
cols.push_back(execplan::SRCP(buildReturnedColumn(row->element_index(i), *gwip, gwip->fatalParseError)));
gwip->clauseType = WHERE;
rowCol->columnVec(cols);
gwip->rcWorkStack.push(rowCol);
break;
}
case Item::EXPR_CACHE_ITEM:
{
((Item_cache_wrapper*)item)->get_orig_item()->traverse_cond(gp_walk, arg, Item::POSTFIX);
break;
}
case Item::WINDOW_FUNC_ITEM:
{
gwip->hasWindowFunc = true;
Item_window_func* ifa = (Item_window_func*)item;
execplan::ReturnedColumn* af = buildWindowFunctionColumn(ifa, *gwip, gwip->fatalParseError);
if (af)
gwip->rcWorkStack.push(af);
break;
}
case Item::COPY_STR_ITEM: printf("********** received COPY_STR_ITEM *********\n"); break;
case Item::FIELD_AVG_ITEM: printf("********** received FIELD_AVG_ITEM *********\n"); break;
case Item::DEFAULT_VALUE_ITEM: printf("********** received DEFAULT_VALUE_ITEM *********\n"); break;
case Item::PROC_ITEM: printf("********** received PROC_ITEM *********\n"); break;
case Item::FIELD_STD_ITEM: printf("********** received FIELD_STD_ITEM *********\n"); break;
case Item::FIELD_VARIANCE_ITEM: printf("********** received FIELD_VARIANCE_ITEM *********\n"); break;
case Item::INSERT_VALUE_ITEM: printf("********** received INSERT_VALUE_ITEM *********\n"); break;
case Item::PARAM_ITEM: printf("********** received PARAM_ITEM *********\n"); break;
case Item::TRIGGER_FIELD_ITEM: printf("********** received TRIGGER_FIELD_ITEM *********\n"); break;
case Item::TYPE_HOLDER: std::cerr << "********** received TYPE_HOLDER *********" << std::endl; break;
default:
{
if (gwip->condPush)
{
// push noop for unhandled item
execplan::SimpleColumn* rc = new execplan::SimpleColumn("noop");
rc->timeZone(gwip->timeZone);
gwip->rcWorkStack.push(rc);
break;
}
ostringstream oss;
oss << "Unhandled Item type (2): " << item->type();
gwip->parseErrorText = oss.str();
gwip->fatalParseError = true;
break;
}
}
return;
}
/** @info this function recursivly walks an item's arguments and push all
* the involved item_fields to the passed in vector. It's used in parsing
* functions or arithmetic expressions for vtable post process.
*/
void parse_item(Item* item, vector<Item_field*>& field_vec, bool& hasNonSupportItem, uint16_t& parseInfo,
gp_walk_info* gwi)
{
Item::Type itype = item->type();
switch (itype)
{
case Item::FIELD_ITEM:
{
Item_field* ifp = static_cast<Item_field*>(item);
field_vec.push_back(ifp);
return;
}
case Item::SUM_FUNC_ITEM:
{
// hasAggColumn = true;
parseInfo |= AGG_BIT;
Item_sum* isp = static_cast<Item_sum*>(item);
Item** sfitempp = isp->arguments();
for (uint32_t i = 0; i < isp->argument_count(); i++)
parse_item(sfitempp[i], field_vec, hasNonSupportItem, parseInfo, gwi);
break;
}
case Item::FUNC_ITEM:
{
Item_func* isp = static_cast<Item_func*>(item);
if (string(isp->func_name()) == "<in_optimizer>")
{
parseInfo |= SUB_BIT;
parseInfo |= CORRELATED;
break;
}
for (uint32_t i = 0; i < isp->argument_count(); i++)
parse_item(isp->arguments()[i], field_vec, hasNonSupportItem, parseInfo, gwi);
break;
}
case Item::COND_ITEM:
{
Item_cond* icp = static_cast<Item_cond*>(item);
List_iterator_fast<Item> it(*(icp->argument_list()));
Item* cond_item;
while ((cond_item = it++))
parse_item(cond_item, field_vec, hasNonSupportItem, parseInfo, gwi);
break;
}
case Item::REF_ITEM:
{
Item_ref* ref = (Item_ref*)item;
if (ref->ref_type() == Item_ref::DIRECT_REF)
{
parse_item(ref->real_item(), field_vec, hasNonSupportItem, parseInfo, gwi);
break;
}
while (true)
{
ref = (Item_ref*)item;
if ((*(ref->ref))->type() == Item::SUM_FUNC_ITEM)
{
parseInfo |= AGG_BIT;
Item_sum* isp = static_cast<Item_sum*>(*(ref->ref));
Item** sfitempp = isp->arguments();
// special handling for count(*). This should not be treated as constant.
if (isSupportedAggregateWithOneConstArg(isp, sfitempp))
{
field_vec.push_back(nullptr); // dummy
}
for (uint32_t i = 0; i < isp->argument_count(); i++)
parse_item(sfitempp[i], field_vec, hasNonSupportItem, parseInfo, gwi);
break;
}
else if ((*(ref->ref))->type() == Item::FIELD_ITEM)
{
// MCOL-1510. This could be a non-supported function
// argument in form of a temp_table_field, so check
// and set hasNonSupportItem if it is so.
// ReturnedColumn* rc = NULL;
// if (gwi)
// rc = buildAggFrmTempField(ref, *gwi);
// if (!rc)
//{
Item_field* ifp = static_cast<Item_field*>(*(ref->ref));
field_vec.push_back(ifp);
//}
break;
}
else if ((*(ref->ref))->type() == Item::FUNC_ITEM)
{
Item_func* isp = static_cast<Item_func*>(*(ref->ref));
Item** sfitempp = isp->arguments();
for (uint32_t i = 0; i < isp->argument_count(); i++)
parse_item(sfitempp[i], field_vec, hasNonSupportItem, parseInfo, gwi);
break;
}
else if ((*(ref->ref))->type() == Item::CACHE_ITEM)
{
Item_cache* isp = static_cast<Item_cache*>(*(ref->ref));
parse_item(isp->get_example(), field_vec, hasNonSupportItem, parseInfo, gwi);
break;
}
else if ((*(ref->ref))->type() == Item::REF_ITEM)
{
item = (*(ref->ref));
continue;
}
else if ((*(ref->ref))->type() == Item::WINDOW_FUNC_ITEM)
{
parseInfo |= AF_BIT;
break;
}
else
{
cerr << "UNKNOWN REF Item" << endl;
break;
}
}
break;
}
case Item::SUBSELECT_ITEM:
{
parseInfo |= SUB_BIT;
Item_subselect* sub = (Item_subselect*)item;
if (sub->is_correlated)
parseInfo |= CORRELATED;
break;
}
case Item::ROW_ITEM:
{
Item_row* row = (Item_row*)item;
for (uint32_t i = 0; i < row->cols(); i++)
parse_item(row->element_index(i), field_vec, hasNonSupportItem, parseInfo, gwi);
break;
}
case Item::EXPR_CACHE_ITEM:
{
// item is a Item_cache_wrapper. Shouldn't get here.
// DRRTUY TODO Why
IDEBUG(std::cerr << "EXPR_CACHE_ITEM in parse_item\n" << std::endl);
gwi->fatalParseError = true;
// DRRTUY The questionable error text. I've seen
// ERR_CORRELATED_SUB_OR
string parseErrorText = logging::IDBErrorInfo::instance()->errorMsg(logging::ERR_NON_SUPPORT_SUB_QUERY_TYPE);
setError(gwi->thd, ER_CHECK_NOT_IMPLEMENTED, parseErrorText);
break;
}
case Item::WINDOW_FUNC_ITEM: parseInfo |= AF_BIT; break;
default: break;
}
}
void debug_walk(const Item* item, void* arg)
{
switch (item->type())
{
case Item::FIELD_ITEM:
{
Item_field* ifp = (Item_field*)item;
cerr << "FIELD_ITEM: " << (ifp->db_name.str ? ifp->db_name.str : "") << '.' << bestTableName(ifp) << '.'
<< ifp->field_name.str << endl;
break;
}
case Item::CONST_ITEM:
{
switch (item->cmp_type())
{
case INT_RESULT:
{
Item_int* iip = (Item_int*)item;
cerr << "INT_ITEM: ";
if (iip->name.length)
cerr << iip->name.str << " (from name string)" << endl;
else
cerr << iip->val_int() << endl;
break;
}
case STRING_RESULT:
{
Item_string* isp = (Item_string*)item;
String val, *str = isp->val_str(&val);
string valStr;
valStr.assign(str->ptr(), str->length());
cerr << "STRING_ITEM: >" << valStr << '<' << endl;
break;
}
case REAL_RESULT:
{
cerr << "REAL_ITEM" << endl;
break;
}
case DECIMAL_RESULT:
{
cerr << "DECIMAL_ITEM" << endl;
break;
}
case TIME_RESULT:
{
String val, *str = NULL;
Item_temporal_literal* itp = (Item_temporal_literal*)item;
str = itp->val_str(&val);
cerr << "DATE ITEM: ";
if (str)
cerr << ": (" << str->ptr() << ')' << endl;
else
cerr << ": <NULL>" << endl;
break;
}
default:
{
cerr << ": Unknown cmp_type" << endl;
break;
}
}
break;
}
case Item::FUNC_ITEM:
{
Item_func* ifp = (Item_func*)item;
Item_func_opt_neg* inp;
cerr << "FUNC_ITEM: ";
switch (ifp->functype())
{
case Item_func::UNKNOWN_FUNC: // 0
cerr << ifp->func_name() << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::GT_FUNC: // 7
cerr << '>' << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::EQ_FUNC: // 1
cerr << '=' << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::GE_FUNC: cerr << ">=" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::LE_FUNC: cerr << "<=" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::LT_FUNC: cerr << '<' << " (" << ifp->functype() << ")" << endl; break;
case Item_func::NE_FUNC: cerr << "<>" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::NEG_FUNC: // 45
cerr << "unary minus" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::IN_FUNC: // 16
inp = (Item_func_opt_neg*)ifp;
if (inp->negated)
cerr << "not ";
cerr << "in" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::BETWEEN:
inp = (Item_func_opt_neg*)ifp;
if (inp->negated)
cerr << "not ";
cerr << "between" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::ISNULL_FUNC: // 10
cerr << "is null" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::ISNOTNULL_FUNC: // 11
cerr << "is not null" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::NOT_ALL_FUNC: cerr << "not_all" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::NOT_FUNC: cerr << "not_func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::TRIG_COND_FUNC:
cerr << "trig_cond_func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::ISNOTNULLTEST_FUNC:
cerr << "isnotnulltest_func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::MULT_EQUAL_FUNC:
{
cerr << "mult_equal_func:" << " (" << ifp->functype() << ")" << endl;
Item_equal* item_eq = (Item_equal*)ifp;
Item_equal_fields_iterator it(*item_eq);
Item* item;
while ((item = it++))
{
Field* equal_field = it.get_curr_field();
cerr << equal_field->field_name.str << endl;
}
break;
}
case Item_func::EQUAL_FUNC: cerr << "equal func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::FT_FUNC: cerr << "ft func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::LIKE_FUNC: cerr << "like func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::COND_AND_FUNC:
cerr << "cond and func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::COND_OR_FUNC: cerr << "cond or func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::XOR_FUNC: cerr << "xor func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::INTERVAL_FUNC:
cerr << "interval func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_EQUALS_FUNC:
cerr << "sp equals func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_DISJOINT_FUNC:
cerr << "sp disjoint func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_INTERSECTS_FUNC:
cerr << "sp intersects func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_TOUCHES_FUNC:
cerr << "sp touches func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_CROSSES_FUNC:
cerr << "sp crosses func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_WITHIN_FUNC:
cerr << "sp within func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_CONTAINS_FUNC:
cerr << "sp contains func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_OVERLAPS_FUNC:
cerr << "sp overlaps func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_STARTPOINT:
cerr << "sp startpoint func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_ENDPOINT:
cerr << "sp endpoint func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_EXTERIORRING:
cerr << "sp exteriorring func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_POINTN: cerr << "sp pointn func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::SP_GEOMETRYN:
cerr << "sp geometryn func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_INTERIORRINGN:
cerr << "sp exteriorringn func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::SP_RELATE_FUNC:
cerr << "sp relate func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::NOW_FUNC: cerr << "now func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::SUSERVAR_FUNC:
cerr << "suservar func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::GUSERVAR_FUNC:
cerr << "guservar func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::COLLATE_FUNC: cerr << "collate func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::EXTRACT_FUNC: cerr << "extract func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::CHAR_TYPECAST_FUNC:
cerr << "char typecast func" << " (" << ifp->functype() << ")" << endl;
break;
case Item_func::FUNC_SP: cerr << "func sp func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::UDF_FUNC: cerr << "udf func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::GSYSVAR_FUNC: cerr << "gsysvar func" << " (" << ifp->functype() << ")" << endl; break;
case Item_func::DYNCOL_FUNC: cerr << "dyncol func" << " (" << ifp->functype() << ")" << endl; break;
default: cerr << "type=" << ifp->functype() << endl; break;
}
break;
}
case Item::COND_ITEM:
{
Item_cond* icp = (Item_cond*)item;
cerr << "COND_ITEM: " << icp->func_name() << endl;
break;
}
case Item::SUM_FUNC_ITEM:
{
Item_sum* isp = (Item_sum*)item;
char* item_name = const_cast<char*>(item->name.str);
// MCOL-1052 This is an extended SELECT list item
if (!item_name && isp->get_arg_count() && isp->get_arg(0)->name.length)
{
item_name = const_cast<char*>(isp->get_arg(0)->name.str);
}
else if (!item_name && isp->get_arg_count() && isp->get_arg(0)->type() == Item::CONST_ITEM &&
isp->get_arg(0)->cmp_type() == INT_RESULT)
{
item_name = (char*)"INT||*";
}
else if (!item_name)
{
item_name = (char*)"<NULL>";
}
switch (isp->sum_func())
{
case Item_sum::SUM_FUNC: cerr << "SUM_FUNC: " << item_name << endl; break;
case Item_sum::SUM_DISTINCT_FUNC: cerr << "SUM_DISTINCT_FUNC: " << item_name << endl; break;
case Item_sum::AVG_FUNC: cerr << "AVG_FUNC: " << item_name << endl; break;
case Item_sum::COUNT_FUNC: cerr << "COUNT_FUNC: " << item_name << endl; break;
case Item_sum::COUNT_DISTINCT_FUNC: cerr << "COUNT_DISTINCT_FUNC: " << item_name << endl; break;
case Item_sum::MIN_FUNC: cerr << "MIN_FUNC: " << item_name << endl; break;
case Item_sum::MAX_FUNC: cerr << "MAX_FUNC: " << item_name << endl; break;
case Item_sum::UDF_SUM_FUNC: cerr << "UDAF_FUNC: " << item_name << endl; break;
default: cerr << "SUM_FUNC_ITEM type=" << isp->sum_func() << endl; break;
}
break;
}
case Item::SUBSELECT_ITEM:
{
Item_subselect* sub = (Item_subselect*)item;
cerr << "SUBSELECT Item: ";
switch (sub->substype())
{
case Item_subselect::EXISTS_SUBS: cerr << "EXISTS"; break;
case Item_subselect::IN_SUBS: cerr << "IN"; break;
default: cerr << sub->substype(); break;
}
cerr << endl;
JOIN* join = sub->get_select_lex()->join;
if (join)
{
Item_cond* cond = static_cast<Item_cond*>(join->conds);
if (cond)
cond->traverse_cond(debug_walk, arg, Item::POSTFIX);
}
cerr << "Finish subselect item traversing" << endl;
break;
}
case Item::REF_ITEM:
{
Item_ref* ref = (Item_ref*)item;
if (ref->real_item()->type() == Item::CACHE_ITEM)
{
Item* field = ((Item_cache*)ref->real_item())->get_example();
if (field->type() == Item::FIELD_ITEM)
{
Item_field* ifp = (Item_field*)field;
// ifp->cached_table->select_lex->select_number gives the select level.
// could be used on alias.
// could also be used to tell correlated join (equal level).
cerr << "CACHED REF FIELD_ITEM: " << ifp->db_name.str << '.' << bestTableName(ifp) << '.'
<< ifp->field_name.str << endl;
break;
}
else if (field->type() == Item::FUNC_ITEM)
{
Item_func* ifp = (Item_func*)field;
cerr << "CACHED REF FUNC_ITEM " << ifp->func_name() << endl;
}
else if (field->type() == Item::REF_ITEM)
{
Item_ref* ifr = (Item_ref*)field;
string refType;
string realType;
switch (ifr->ref_type())
{
case Item_ref::REF: refType = "REF"; break;
case Item_ref::DIRECT_REF: refType = "DIRECT_REF"; break;
case Item_ref::VIEW_REF: refType = "VIEW_REF"; break;
case Item_ref::OUTER_REF: refType = "OUTER_REF"; break;
case Item_ref::AGGREGATE_REF: refType = "AGGREGATE_REF"; break;
default: refType = "UNKNOWN"; break;
}
switch (ifr->real_type())
{
case Item::FIELD_ITEM:
{
Item_field* ifp = (Item_field*)(*(ifr->ref));
realType = "FIELD_ITEM ";
realType += ifp->db_name.str;
realType += '.';
realType += bestTableName(ifp);
realType += '.';
realType += ifp->field_name.str;
break;
}
case Item::SUM_FUNC_ITEM:
{
Item_sum* isp = (Item_sum*)(*(ifr->ref));
if (isp->sum_func() == Item_sum::GROUP_CONCAT_FUNC)
realType = "GROUP_CONCAT_FUNC";
else
realType = "SUM_FUNC_ITEM";
break;
}
case Item::REF_ITEM:
// Need recursion here
realType = "REF_ITEM";
break;
case Item::FUNC_ITEM:
{
Item_func* ifp = (Item_func*)(*(ifr->ref));
realType = "FUNC_ITEM ";
realType += ifp->func_name();
break;
}
default:
{
realType = "UNKNOWN";
}
}
cerr << "CACHED REF_ITEM: ref type " << refType.c_str() << " real type " << realType.c_str()
<< endl;
break;
}
else
{
cerr << "REF_ITEM with CACHE_ITEM type unknown " << field->type() << endl;
}
}
else if (ref->real_item()->type() == Item::FIELD_ITEM)
{
Item_field* ifp = (Item_field*)ref->real_item();
// MCOL-1052 The field referenced presumable came from
// extended SELECT list.
if (!ifp->field_name.str)
{
cerr << "REF extra FIELD_ITEM: " << ifp->name.str << endl;
}
else
{
cerr << "REF FIELD_ITEM: " << ifp->db_name.str << '.' << bestTableName(ifp) << '.'
<< ifp->field_name.str << endl;
}
break;
}
else if (ref->real_item()->type() == Item::FUNC_ITEM)
{
Item_func* ifp = (Item_func*)ref->real_item();
cerr << "REF FUNC_ITEM " << ifp->func_name() << endl;
}
else if (ref->real_item()->type() == Item::WINDOW_FUNC_ITEM)
{
Item_window_func* ifp = (Item_window_func*)ref->real_item();
cerr << "REF WINDOW_FUNC_ITEM " << ifp->window_func()->func_name() << endl;
}
else
{
cerr << "UNKNOWN REF ITEM type " << ref->real_item()->type() << endl;
}
break;
}
case Item::ROW_ITEM:
{
Item_row* row = (Item_row*)item;
cerr << "ROW_ITEM: " << endl;
for (uint32_t i = 0; i < row->cols(); i++)
debug_walk(row->element_index(i), 0);
break;
}
case Item::EXPR_CACHE_ITEM:
{
cerr << "Expr Cache Item" << endl;
((Item_cache_wrapper*)item)->get_orig_item()->traverse_cond(debug_walk, arg, Item::POSTFIX);
break;
}
case Item::CACHE_ITEM:
{
Item_cache* isp = (Item_cache*)item;
// MCOL-46 isp->val_str() can cause a call to execute a subquery. We're not set up
// to execute yet.
#if 0
switch (item->result_type())
{
case STRING_RESULT:
cerr << "CACHE_STRING_ITEM" << endl;
break;
case REAL_RESULT:
cerr << "CACHE_REAL_ITEM " << isp->val_real() << endl;
break;
case INT_RESULT:
cerr << "CACHE_INT_ITEM " << isp->val_int() << endl;
break;
case ROW_RESULT:
cerr << "CACHE_ROW_ITEM" << endl;
break;
case DECIMAL_RESULT:
cerr << "CACHE_DECIMAL_ITEM " << isp->val_decimal() << endl;
break;
default:
cerr << "CACHE_UNKNOWN_ITEM" << endl;
break;
}
#endif
Item* field = isp->get_example();
if (field->type() == Item::FIELD_ITEM)
{
Item_field* ifp = (Item_field*)field;
// ifp->cached_table->select_lex->select_number gives the select level.
// could be used on alias.
// could also be used to tell correlated join (equal level).
cerr << "CACHED FIELD_ITEM: " << ifp->db_name.str << '.' << bestTableName(ifp) << '.'
<< ifp->field_name.str << endl;
break;
}
else if (field->type() == Item::REF_ITEM)
{
Item_ref* ifr = (Item_ref*)field;
string refType;
string realType;
switch (ifr->ref_type())
{
case Item_ref::REF: refType = "REF"; break;
case Item_ref::DIRECT_REF: refType = "DIRECT_REF"; break;
case Item_ref::VIEW_REF: refType = "VIEW_REF"; break;
case Item_ref::OUTER_REF: refType = "OUTER_REF"; break;
case Item_ref::AGGREGATE_REF: refType = "AGGREGATE_REF"; break;
default: refType = "UNKNOWN"; break;
}
switch (ifr->real_type())
{
case Item::FIELD_ITEM:
{
Item_field* ifp = (Item_field*)(*(ifr->ref));
realType = "FIELD_ITEM ";
realType += ifp->db_name.str;
realType += '.';
realType += bestTableName(ifp);
realType += '.';
realType += ifp->field_name.str;
break;
}
case Item::SUM_FUNC_ITEM:
{
Item_sum* isp = (Item_sum*)(*(ifr->ref));
if (isp->sum_func() == Item_sum::GROUP_CONCAT_FUNC)
realType = "GROUP_CONCAT_FUNC";
else
realType = "SUM_FUNC_ITEM";
break;
}
case Item::REF_ITEM:
// Need recursion here
realType = "REF_ITEM";
break;
case Item::FUNC_ITEM:
{
Item_func* ifp = (Item_func*)(*(ifr->ref));
realType = "FUNC_ITEM ";
realType += ifp->func_name();
break;
}
default:
{
realType = "UNKNOWN";
}
}
cerr << "CACHE_ITEM ref type " << refType.c_str() << " real type " << realType.c_str() << endl;
break;
}
else if (field->type() == Item::FUNC_ITEM)
{
Item_func* ifp = (Item_func*)field;
cerr << "CACHE_ITEM FUNC_ITEM " << ifp->func_name() << endl;
break;
}
else
{
cerr << "CACHE_ITEM type unknown " << field->type() << endl;
}
break;
}
case Item::WINDOW_FUNC_ITEM:
{
Item_window_func* ifp = (Item_window_func*)item;
cerr << "Window Function Item " << ifp->window_func()->func_name() << endl;
break;
}
case Item::NULL_ITEM:
{
cerr << "NULL item" << endl;
break;
}
case Item::TYPE_HOLDER:
{
cerr << "TYPE_HOLDER item with cmp_type " << item->cmp_type() << endl;
break;
}
default:
{
cerr << "UNKNOWN_ITEM type " << item->type() << endl;
break;
}
}
}
}
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