}
if (!(x.getParent() instanceof SQLSelectItem)) {
return false;
}
SQLSelectItem item = (SQLSelectItem) x.getParent();
if (!(item.getParent() instanceof SQLSelectQueryBlock)) {
return false;
}
SQLSelectQueryBlock queryBlock = (SQLSelectQueryBlock) item.getParent();
if (!queryBlockFromIsNull(visitor, queryBlock)) {
return false;
}
if (!(queryBlock.getParent() instanceof SQLSelect)) {