void AmendColumnWalker::MutableVisit(Expr *io_expr)
{
switch (io_expr->GetExprType())
{
case Expr::kExprColumnRef:
{
Status result;
ColumnExpr *pColExpr = dynamic_cast<ColumnExpr *>(io_expr);
PDASSERT(pColExpr);
if (pColExpr)
{
ColumnQualifiedName qualifiedName = pColExpr->GetQualifiedColumnName();
if (qualifiedName.tableName.empty())
{
bool hasMatch = false;
std::string ownedTableName;
TableAndColumnSetMap::const_iterator setIter = mTableAndColumnSetMap.begin();
for (; setIter != mTableAndColumnSetMap.end(); setIter++)
{
ColumnNameSet::const_iterator columnIter = setIter->second.begin();
for (; columnIter != setIter->second.end(); columnIter++)
{
if (*columnIter == qualifiedName.columnName)
{
if (hasMatch)
{
result = Status::kAmbiguousColumn;
break;
}
else
{
ownedTableName = setIter->first;
hasMatch = true;
}
}
}
}
if (result.OK())
{
if (hasMatch)
{
qualifiedName.tableName = ownedTableName;
pColExpr->SetQualifiedColumnName(qualifiedName);
}
}
}
}
break;
}
default:
break;
}
}
