// change literals of a cacheable query into ConstantParameters and save
// true root into cachewa so we can "bind" ConstantParameters as "inputvars"
RelExpr* RelRoot::normalizeForCache(CacheWA& cwa, BindWA& bindWA)
{
if (nodeIsNormalizedForCache()) {
return this;
}
if (isTrueRoot()) {
cwa.setTopRoot(this);
}
if (cwa.getPhase() >= CmpMain::BIND) {
// replace any select list literals into constant parameters
if (compExprTree_) {
compExprTree_ = compExprTree_->normalizeForCache(cwa, bindWA);
}
else {
compExpr_.normalizeForCache(cwa, bindWA);
}
}
// replace descendants' literals into ConstantParameters
RelExpr *result = RelExpr::normalizeForCache(cwa, bindWA);
if (cwa.getPhase() >= CmpMain::BIND) {
// query tree has undergone BINDing, but RelExpr::normalizeForCache
// may have introduced new ConstantParameters in place of ConstValues;
// we want to BIND these new ConstantParameters but a RelRoot::bindNode()
// call here would be overkill; we just want these new ConstantParameters
// to be "bound" as "inputvars"; so, we selectively cut and paste code
// from BindRelExpr.cpp RelRoot::bindNode into here to "bind" any new
// ConstantParameters as "inputvars".
ItemExpr *inputVarTree = removeInputVarTree();
if (inputVarTree) {
inputVarTree->convertToValueIdList(inputVars(), &bindWA, ITM_ITEM_LIST);
if (bindWA.errStatus()) {
return NULL;
}
}
}
return result;
}
