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hqlstmt.cpp
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hqlstmt.cpp
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/*##############################################################################
Copyright (C) 2011 HPCC Systems.
All rights reserved. This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
############################################################################## */
#include "jliball.hpp"
#include "hql.hpp"
#include "platform.h"
#include "jlib.hpp"
#include "jexcept.hpp"
#include "jmisc.hpp"
#include "hqlexpr.hpp"
#include "hqlstmt.hpp"
#include "hqlstmt.ipp"
#include "hqlfunc.hpp"
#include "hqlcpp.ipp"
#include "hqlcatom.hpp"
#include "hqlcpputil.hpp"
#include "hqlutil.hpp"
#define CLEAR_COPY_THRESHOLD 100
//---------------------------------------------------------------------------
struct HQLCPP_API HqlBoundDefinedValue : public HqlDefinedValue
{
public:
HqlBoundDefinedValue(IHqlExpression * _original, const CHqlBoundExpr & _bound) : HqlDefinedValue(_original)
{ bound.set(_bound); }
virtual IHqlExpression * queryExpr() const { return bound.expr; }
virtual void getBound(CHqlBoundExpr & result) { result.set(bound); }
public:
CHqlBoundExpr bound;
};
void HqlExprAssociation::getBound(CHqlBoundExpr & result)
{
result.expr.set(queryExpr());
}
//---------------------------------------------------------------------------
BuildCtx::BuildCtx(HqlCppInstance & _state, _ATOM section) : state(_state)
{
init(state.ensureSection(section));
}
BuildCtx::BuildCtx(HqlCppInstance & _state) : state(_state)
{
init(NULL);
}
BuildCtx::BuildCtx(BuildCtx & _owner) : state(_owner.state)
{
init(_owner.curStmts);
ignoreInput = _owner.ignoreInput;
curPriority = _owner.curPriority;
nextPriority = _owner.nextPriority;
ignoreInput = false;
}
BuildCtx::BuildCtx(BuildCtx & _owner, HqlStmts * _root) : state(_owner.state)
{
init(_root);
}
BuildCtx::~BuildCtx()
{
}
void BuildCtx::set(_ATOM section)
{
init(state.ensureSection(section));
}
void BuildCtx::set(BuildCtx & _owner)
{
init(_owner.curStmts);
ignoreInput = _owner.ignoreInput;
curPriority = _owner.curPriority;
nextPriority = _owner.nextPriority;
ignoreInput = false;
}
IHqlStmt * BuildCtx::addAlias(IHqlStmt * aliased)
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlCompoundStmt(alias_stmt, curStmts);
HqlStmt * cast = dynamic_cast<HqlStmt *>(aliased);
assertex(cast);
next->code.append(*LINK(cast));
return appendSimple(next);
}
IHqlStmt * BuildCtx::addAssign(IHqlExpression * target, IHqlExpression * value)
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(assign_stmt, curStmts);
next->addExpr(LINK(target));
next->addExpr(LINK(value));
return appendSimple(next);
}
IHqlStmt * BuildCtx::addAssignIncrement(IHqlExpression * target, IHqlExpression * value)
{
if (ignoreInput)
return NULL;
if (value && !matchesConstantValue(value, 1))
{
HqlStmt * next = new HqlStmt(assigninc_stmt, curStmts);
next->addExpr(LINK(target));
next->addExpr(LINK(value));
return appendSimple(next);
}
else
{
OwnedHqlExpr inc = createValue(no_postinc, target->getType(), LINK(target));
return addExprOwn(inc.getClear());
}
}
IHqlStmt * BuildCtx::addAssignDecrement(IHqlExpression * target, IHqlExpression * value)
{
if (ignoreInput)
return NULL;
if (value && !matchesConstantValue(value, 1))
{
HqlStmt * next = new HqlStmt(assigndec_stmt, curStmts);
next->addExpr(LINK(target));
next->addExpr(LINK(value));
return appendSimple(next);
}
else
{
OwnedHqlExpr inc = createValue(no_postdec, LINK(target->getType()), LINK(target));
return addExprOwn(inc.getClear());
}
}
IHqlStmt * BuildCtx::addBlock()
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlCompoundStmt(block_stmt, curStmts);
return appendCompound(next);
}
IHqlStmt * BuildCtx::addBreak()
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(break_stmt, curStmts);
return appendSimple(next);
}
IHqlStmt * BuildCtx::addCase(IHqlStmt * _owner, IHqlExpression * source)
{
if (ignoreInput)
return NULL;
assertThrow(_owner->getStmt() == switch_stmt);
HqlCompoundStmt & owner = (HqlCompoundStmt &)*_owner;
curStmts = &owner.code;
HqlCompoundStmt * next = new HqlCompoundStmt(case_stmt, curStmts);
next->addExpr(LINK(source));
return appendCompound(next);
}
IHqlStmt * BuildCtx::addContinue()
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(continue_stmt, curStmts);
return appendSimple(next);
}
IHqlStmt * BuildCtx::addDeclare(IHqlExpression * name, IHqlExpression * value)
{
assertex(name->getOperator() == no_variable);
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(declare_stmt, curStmts);
next->addExpr(LINK(name));
if (value)
next->addExpr(LINK(value));
appendSimple(next);
return next;
}
IHqlStmt * BuildCtx::addDeclareExternal(IHqlExpression * name)
{
assertex(name->getOperator() == no_variable);
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(external_stmt, curStmts);
next->addExpr(LINK(name));
appendSimple(next);
return next;
}
IHqlStmt * BuildCtx::addDeclareAssign(IHqlExpression * name, IHqlExpression * value)
{
addDeclare(name);
return addAssign(name, value);
}
IHqlStmt * BuildCtx::addDefault(IHqlStmt * _owner)
{
if (ignoreInput)
return NULL;
assertThrow(_owner->getStmt() == switch_stmt);
selectCompound(_owner);
HqlCompoundStmt * next = new HqlCompoundStmt(default_stmt, curStmts);
return appendCompound(next);
}
IHqlStmt * BuildCtx::addExpr(IHqlExpression * value)
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(expr_stmt, curStmts);
next->addExpr(LINK(value));
return appendSimple(next);
}
IHqlStmt * BuildCtx::addExprOwn(IHqlExpression * value)
{
if (ignoreInput)
{
value->Release();
return NULL;
}
HqlStmt * next = new HqlStmt(expr_stmt, curStmts);
next->addExpr(value);
return appendSimple(next);
}
IHqlStmt * BuildCtx::addReturn(IHqlExpression * value)
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(return_stmt, curStmts);
if (value)
next->addExpr( LINK(value));
return appendSimple(next);
}
IHqlStmt * BuildCtx::addFilter(IHqlExpression * condition)
{
HqlCompoundStmt * next = new HqlCompoundStmt(filter_stmt, curStmts);
next->addExpr(LINK(condition));
appendCompound(next);
addBlock();
return next;
}
IHqlStmt * BuildCtx::addFunction(IHqlExpression * funcdef)
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlCompoundStmt(function_stmt, curStmts);
next->addExpr(LINK(funcdef));
return appendCompound(next);
}
IHqlStmt * BuildCtx::addIndirection(const BuildCtx & _parent)
{
HqlCompoundStmt * next = new HqlCompoundStmt(indirect_stmt, _parent.curStmts);
return appendCompound(next);
}
IHqlStmt * BuildCtx::addLoop(IHqlExpression * cond, IHqlExpression * inc, bool atEnd)
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlCompoundStmt(loop_stmt, curStmts);
if (cond)
next->addExpr(LINK(cond));
if (inc)
next->addExpr(LINK(inc));
if (atEnd)
next->addExpr(createAttribute(endAtom));
return appendCompound(next);
}
IHqlStmt * BuildCtx::addGoto(const char * labelText)
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(goto_stmt, curStmts);
IHqlExpression * label= createVariable(labelText, makeBoolType());
next->addExpr(label);
return appendSimple(next);
}
IHqlStmt * BuildCtx::addGroup()
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlCompoundStmt(group_stmt, curStmts);
return appendCompound(next);
}
IHqlStmt * BuildCtx::addGroupPass(IHqlExpression * pass)
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlCompoundStmt(pass_stmt, curStmts);
next->addExpr(LINK(pass));
return appendCompound(next);
}
IHqlStmt * BuildCtx::addLabel(const char * labelText)
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(label_stmt, curStmts);
IHqlExpression * label= createVariable(labelText, makeBoolType());
next->addExpr(label);
return appendSimple(next);
}
IHqlStmt * BuildCtx::addLine(const char * filename, unsigned lineNum)
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlStmt(line_stmt, curStmts);
if (filename)
{
next->addExpr(createConstant(filename));
next->addExpr(getSizetConstant(lineNum));
}
return appendSimple(next);
}
IHqlStmt * BuildCtx::addQuoted(const char * text)
{
if (ignoreInput)
return NULL;
HqlStmt * next = new HqlQuoteStmt(quote_stmt, curStmts, text);
return appendSimple(next);
}
IHqlStmt * BuildCtx::addQuotedF(const char * format, ...)
{
if (ignoreInput)
return NULL;
StringBuffer text;
va_list args;
va_start(args, format);
text.valist_appendf(format, args);
va_end(args);
HqlStmt * next = new HqlQuoteStmt(quote_stmt, curStmts, text.str());
return appendSimple(next);
}
IHqlStmt * BuildCtx::addQuotedCompound(const char * text, const char * extra)
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlQuoteStmt(quote_compound_stmt, curStmts, text);
if (extra)
next->addExpr(createQuoted(extra, makeVoidType()));
return appendCompound(next);
}
IHqlStmt * BuildCtx::addQuotedCompoundOpt(const char * text, const char * extra)
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlQuoteStmt(quote_compoundopt_stmt, curStmts, text);
if (extra)
next->addExpr(createQuoted(extra, makeVoidType()));
return appendCompound(next);
}
IHqlStmt * BuildCtx::addSwitch(IHqlExpression * source)
{
if (ignoreInput)
return NULL;
HqlCompoundStmt * next = new HqlCompoundStmt(switch_stmt, curStmts);
next->addExpr(LINK(source));
return appendCompound(next);
}
HqlStmt * BuildCtx::appendCompound(HqlCompoundStmt * next)
{
assertThrow(!ignoreInput);
appendSimple(next);
curStmts = &next->code;
return next;
}
HqlStmt * BuildCtx::appendSimple(HqlStmt * next)
{
assertThrow(!ignoreInput);
if (nextPriority == OutermostScopePrio)
{
appendToOutermostScope(next);
}
else
{
next->setPriority(nextPriority);
curStmts->appendStmt(*next);
}
nextPriority = curPriority;
return next;
}
void BuildCtx::appendToOutermostScope(HqlStmt * next)
{
HqlStmts * searchStmts = curStmts;
HqlStmts * insertStmts = NULL;
HqlStmt * insertBefore = NULL;
loop
{
HqlStmt * owner = searchStmts->owner;
if (!owner)
break;
HqlStmts * ownerStmts = owner->queryContainer();
switch (owner->getStmt())
{
case quote_compound_stmt:
case quote_compoundopt_stmt:
case indirect_stmt:
goto found;
case group_stmt:
break;
default:
insertBefore = owner;
insertStmts = ownerStmts;
break;
}
searchStmts = ownerStmts;
}
found:
if (insertBefore)
{
next->setPriority(insertBefore->queryPriority());
insertStmts->add(*next, insertStmts->find(*insertBefore));
}
else
{
next->setPriority(curPriority);
curStmts->appendStmt(*next);
}
}
void BuildCtx::associate(HqlExprAssociation & next)
{
assertex(next.represents->queryBody() == next.represents);
if (!ignoreInput)
{
curStmts->appendOwn(OLINK(next));
}
}
void BuildCtx::associateOwn(HqlExprAssociation & next)
{
assertex(next.represents->queryBody() == next.represents);
if (!ignoreInput)
{
curStmts->appendOwn(next);
}
else
next.Release(); // can cause serious problems....
}
HqlExprAssociation *BuildCtx::associateExpr(IHqlExpression * represents, IHqlExpression * expr)
{
if (!ignoreInput)
{
HqlExprAssociation * assoc = new HqlSimpleDefinedValue(represents->queryBody(), expr);
curStmts->appendOwn(*assoc);
return assoc;
}
return NULL;
}
HqlExprAssociation * BuildCtx::associateExpr(IHqlExpression * represents, const CHqlBoundExpr & bound)
{
if (!ignoreInput)
{
HqlExprAssociation * assoc = new HqlBoundDefinedValue(represents->queryBody(), bound);
curStmts->appendOwn(*assoc);
return assoc;
}
return NULL;
}
IHqlExpression * BuildCtx::getTempDeclare(ITypeInfo * type, IHqlExpression * value)
{
IHqlExpression * temp = createVariable(LINK(type));
addDeclare(temp, value);
return temp;
}
bool BuildCtx::hasAssociation(HqlExprAssociation & search, bool unconditional)
{
HqlStmts * searchStmts = curStmts;
loop
{
if (searchStmts->defs.contains(search))
return true;
HqlStmt * limitStmt = searchStmts->queryStmt();
if (!limitStmt)
return false;
if (!unconditional)
{
switch (limitStmt->getStmt())
{
case filter_stmt:
if (!matchesBoolean(limitStmt->queryExpr(0), true))
return false;
break;
case quote_compound_stmt:
case quote_compoundopt_stmt:
case switch_stmt:
case case_stmt:
case default_stmt:
case loop_stmt:
return false;
}
}
searchStmts = limitStmt->queryContainer();
}
}
void BuildCtx::walkAssociations(IAssociationVisitor & visitor)
{
HqlStmts * searchStmts = curStmts;
// walk all associations in the tree before this one
loop
{
CIArrayOf<HqlExprAssociation> & defs = searchStmts->defs;
ForEachItemInRev(idx, defs)
{
HqlExprAssociation & cur = defs.item(idx);
if (visitor.visit(cur))
return;
}
HqlStmt * limitStmt = searchStmts->queryStmt();
if (!limitStmt)
break;
searchStmts = limitStmt->queryContainer();
}
}
HqlExprAssociation * BuildCtx::queryAssociation(IHqlExpression * search, AssocKind kind, HqlExprCopyArray * selectors)
{
HqlStmts * searchStmts = curStmts;
if (!search)
return NULL;
search = search->queryBody();
// search all statements in the tree before this one, to see
// if an expression already exists... If so return the target
// of the assignment.
loop
{
const CIArrayOf<HqlExprAssociation> & defs = searchStmts->defs;
#ifdef CACHE_DEFINITION_HASHES
if (!selectors)
{
unsigned searchHash = getSearchHash(search);
const DefinitionHashArray & hashes = searchStmts->exprHashes;
ForEachItemInRev(idx, hashes)
{
if (hashes.item(idx) == searchHash)
{
HqlExprAssociation & cur = defs.item(idx);
if (cur.represents == search)
{
if ((kind == AssocAny) || (cur.getKind() == kind))
return &cur;
}
}
}
}
else
#endif
{
ForEachItemInRev(idx, defs)
{
HqlExprAssociation & cur = defs.item(idx);
IHqlExpression * represents = cur.represents.get();
if (selectors && (cur.getKind() == AssocCursor))
{
if (selectors->contains(*represents))
return NULL;
}
if (represents == search)
if ((kind == AssocAny) || (cur.getKind() == kind))
return &cur;
}
}
HqlStmt * limitStmt = searchStmts->queryStmt();
if (!limitStmt)
break;
searchStmts = limitStmt->queryContainer();
}
return NULL;
}
void BuildCtx::removeAssociation(HqlExprAssociation * search)
{
if (!search)
return;
HqlStmts * searchStmts = curStmts;
loop
{
bool matched = searchStmts->zap(*search);
if (matched)
return;
HqlStmt * limitStmt = searchStmts->queryStmt();
if (!limitStmt)
break;
searchStmts = limitStmt->queryContainer();
}
assertex(!"Association not found");
}
HqlExprAssociation * BuildCtx::queryFirstAssociation(AssocKind searchKind)
{
HqlStmts * searchStmts = curStmts;
// search all statements in the tree before this one, to see
// if an expression already exists... If so return the target
// of the assignment.
loop
{
CIArray & defs = searchStmts->defs;
ForEachItemInRev(idx, defs)
{
HqlExprAssociation & cur = (HqlExprAssociation &)defs.item(idx);
if (cur.getKind() == searchKind)
return &cur;
}
HqlStmt * limitStmt = searchStmts->queryStmt();
if (!limitStmt)
break;
searchStmts = limitStmt->queryContainer();
}
return NULL;
}
//Search for an association, but don't allow it to be conditional, or be hidden by the definition of a cursor.
HqlExprAssociation * BuildCtx::queryFirstCommonAssociation(AssocKind searchKind)
{
HqlStmts * searchStmts = curStmts;
// search all statements in the tree before this one, to see
// if an expression already exists... If so return the target
// of the assignment.
loop
{
CIArray & defs = searchStmts->defs;
ForEachItemInRev(idx, defs)
{
HqlExprAssociation & cur = (HqlExprAssociation &)defs.item(idx);
AssocKind kind = cur.getKind();
if (kind == searchKind)
return &cur;
if (kind == AssocCursor)
return NULL;
}
HqlStmt * limitStmt = searchStmts->queryStmt();
if (!limitStmt)
break;
switch (limitStmt->getStmt())
{
//case quote_compound_stmt:
//case quote_compoundopt_stmt,
case filter_stmt:
case label_stmt:
case switch_stmt:
case case_stmt:
case default_stmt:
case break_stmt:
case continue_stmt:
return NULL;
}
searchStmts = limitStmt->queryContainer();
}
return NULL;
}
HqlExprAssociation * BuildCtx::queryMatchExpr(IHqlExpression * search)
{
HqlExprCopyArray selectors;
search->gatherTablesUsed(NULL, &selectors);
return queryAssociation(search, AssocExpr, selectors.ordinality() ? &selectors : NULL);
}
bool BuildCtx::getMatchExpr(IHqlExpression * expr, CHqlBoundExpr & tgt)
{
HqlExprAssociation * match = queryMatchExpr(expr);
if (match)
{
match->getBound(tgt);
return true;
}
return false;
}
void BuildCtx::init(HqlStmts * _root)
{
root = _root;
curStmts = root;
curPriority = NormalPrio;
nextPriority = curPriority;
ignoreInput = false;
}
bool BuildCtx::isChildOf(HqlStmt * stmt, HqlStmts * stmts)
{
//MORE: Could improve by using depths
do
{
if (stmts->find(*stmt) != NotFound)
return true;
stmt = stmt->queryContainer()->queryStmt();
} while (stmt);
return false;
}
void BuildCtx::selectCompound(IHqlStmt * stmt)
{
HqlCompoundStmt & owner = (HqlCompoundStmt &)*stmt;
curStmts = &owner.code;
}
void BuildCtx::selectContainer()
{
HqlStmt * limitStmt = curStmts->queryStmt();
assertex(limitStmt);
curStmts = limitStmt->queryContainer();
assertex(curStmts);
}
void BuildCtx::selectElse(IHqlStmt * stmt)
{
//Ignoring input does not work, because code expects associations to be kept
assertex(stmt);
switch (stmt->getStmt())
{
case filter_stmt:
assertThrow(stmt->numChildren() == 1);
selectCompound(stmt);
addBlock();
break;
default:
throwUnexpected();
break;
}
}
unsigned BuildCtx::setPriority(unsigned newPrio)
{
unsigned oldPriority = curPriority;
if (!ignoreInput)
{
curPriority = newPrio;
nextPriority = curPriority;
}
return oldPriority;
}
void BuildCtx::setNextPriority(unsigned newPrio)
{
if (!ignoreInput)
nextPriority = newPrio;
}
IHqlStmt * BuildCtx::recursiveGetBestContext(HqlStmts * searchStmts, HqlExprCopyArray & required)
{
//Is it ok to move the expression before the owner statement?
//First fail if any of the datasets that this expression is dependent on are defined in this scope.
if (required.ordinality())
{
ForEachItemIn(i, searchStmts->defs)
{
HqlExprAssociation & cur = (HqlExprAssociation &)searchStmts->defs.item(i);
if (required.contains(*cur.represents.get()))
return NULL;
}
}
HqlStmt * owner = searchStmts->owner;
//Now check for poor places to hoist
bool worthHoistingHere = false;
switch (owner->getStmt())
{
case block_stmt:
case group_stmt:
break;
case quote_compound_stmt:
case quote_compoundopt_stmt:
case indirect_stmt:
return NULL;
case filter_stmt:
case switch_stmt:
//MORE: Should make whether something ishoisted dependent on efficiency of the filter condition
break;
case loop_stmt:
//MORE: Should make it dependent on the ordinality of the loop condition.
worthHoistingHere = true;
break;
case case_stmt:
case default_stmt:
//Can't hoist here
break;
default:
throwUnexpected();
}
HqlStmts * container = owner->queryContainer();
if (container->owner)// && canHoistInParent)
{
IHqlStmt * match = recursiveGetBestContext(container, required);
if (match)
return match;
}
if (!worthHoistingHere)
return NULL;
//We've found somewhere we can insert the expression....
unsigned existingPos = container->find(*owner);
assertex(existingPos != NotFound);
//insert a group just before the current statement
HqlCompoundStmt * next = new HqlCompoundStmt(group_stmt, container);
next->setPriority(owner->queryPriority());
container->add(*next, existingPos);
curStmts = &next->code;
return next;
}
IHqlStmt * BuildCtx::replaceExpr(IHqlStmt * stmt, IHqlExpression * expr)
{
//Highly dangerous - use with utmost care!
assertex(stmt->getStmt() == expr_stmt);
HqlStmt * castStmt = static_cast<HqlStmt *>(stmt);
castStmt->killExprs();
castStmt->addExpr(LINK(expr));
return castStmt;
}
IHqlStmt * BuildCtx::selectBestContext(IHqlExpression * expr)
{
if (containsTranslated(expr) || !curStmts->owner)
return NULL;
//MORE: Access to global context, context and other things...
HqlExprCopyArray inScope;
expr->gatherTablesUsed(NULL, &inScope);
return recursiveGetBestContext(curStmts, inScope);
}
//---------------------------------------------------------------------------
HqlStmts::HqlStmts(HqlStmt * _owner) : owner(_owner)
{
}
void HqlStmts::appendStmt(HqlStmt & stmt)
{
unsigned newPrio = stmt.queryPriority();
unsigned right = ordinality();
if (right == 0)
{
append(stmt);
}
else if (newPrio >= item(right-1).queryPriority())
{
while (item(right-1).isIncomplete())
{
if (newPrio > item(right-1).queryPriority())
break;
right--;
if (right == 0)
break;
}
add(stmt, right);
}
else
{
unsigned left = 0;
while (right - left >= 2)
{
unsigned mid = (left + right - 1) / 2;
HqlStmt & cur = item(mid);
if (newPrio >= cur.queryPriority())
left = mid+1;
else
right = mid+1;
}
if (newPrio >= item(left).queryPriority())
++left;
while (left && item(left-1).isIncomplete() && (newPrio == item(left-1).queryPriority()))
--left;
add(stmt, left);
}
}
//---------------------------------------------------------------------------
HqlStmt::HqlStmt(StmtKind _kind, HqlStmts * _container)
{