提交 1b87114e authored 作者: Evgenij Ryazanov's avatar Evgenij Ryazanov

Remove Parser.sortTableFilters(), this optimization is not needed in modern Java

上级 7a2a5446
......@@ -208,7 +208,10 @@ public class Parser {
new Comparator<TableFilter>() {
@Override
public int compare(TableFilter o1, TableFilter o2) {
return o1 == o2 ? 0 : compareTableFilters(o1, o2);
if (o1 == o2)
return 0;
assert o1.getOrderInFrom() != o2.getOrderInFrom();
return o1.getOrderInFrom() > o2.getOrderInFrom() ? 1 : -1;
}
};
......@@ -2160,41 +2163,8 @@ public class Parser {
// Parser can reorder joined table filters, need to explicitly sort them
// to get the order as it was in the original query.
if (session.isForceJoinOrder()) {
sortTableFilters(command.getTopFilters());
}
}
private static void sortTableFilters(ArrayList<TableFilter> filters) {
if (filters.size() < 2) {
return;
}
// Most probably we are already sorted correctly.
boolean sorted = true;
TableFilter prev = filters.get(0);
for (int i = 1; i < filters.size(); i++) {
TableFilter next = filters.get(i);
if (compareTableFilters(prev, next) > 0) {
sorted = false;
break;
}
prev = next;
Collections.sort(command.getTopFilters(), TABLE_FILTER_COMPARATOR);
}
// If not, then sort manually.
if (!sorted) {
Collections.sort(filters, TABLE_FILTER_COMPARATOR);
}
}
/**
* Find out which of the table filters appears first in the "from" clause.
*
* @param o1 the first table filter
* @param o2 the second table filter
* @return -1 if o1 appears first, and 1 if o2 appears first
*/
static int compareTableFilters(TableFilter o1, TableFilter o2) {
assert o1.getOrderInFrom() != o2.getOrderInFrom();
return o1.getOrderInFrom() > o2.getOrderInFrom() ? 1 : -1;
}
private void parseJoinTableFilter(TableFilter top, final Select command) {
......
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