AMashenkov commented on a change in pull request #411:
URL: https://github.com/apache/ignite-3/pull/411#discussion_r741702634
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File path:
modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/rel/IgniteMergeJoin.java
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@@ -166,30 +168,39 @@ else if (isPrefix(rightCollation.getKeys(),
joinInfo.rightKeys))// preserve righ
int rightOff = this.left.getRowType().getFieldCount();
- Map<Integer, Integer> rightToLeft = joinInfo.pairs().stream()
- .collect(Collectors.toMap(p -> p.target, p -> p.source));
+ List<IntPair> pairs = joinInfo.pairs();
+
+ Int2IntOpenHashMap rightToLeft = new Int2IntOpenHashMap(pairs.size());
+
+ for (IntPair pair : pairs)
+ rightToLeft.put(pair.target, pair.source);
List<Integer> collationLeftPrj = new ArrayList<>();
- for (Integer c : collation.getKeys()) {
+ for (RelFieldCollation fieldCollation :
collation.getFieldCollations()) {
+ int c = fieldCollation.getFieldIndex();
collationLeftPrj.add(
- c >= rightOff ? rightToLeft.get(c - rightOff) : c
+ c >= rightOff ? rightToLeft.get(c - rightOff) : c
);
}
boolean preserveNodeCollation = false;
List<Integer> newLeftCollation, newRightCollation;
- Map<Integer, Integer> leftToRight = joinInfo.pairs().stream()
- .collect(Collectors.toMap(p -> p.source, p -> p.target));
+ Int2IntOpenHashMap leftToRight = new Int2IntOpenHashMap(pairs.size());
+
+ for (IntPair pair : pairs)
+ leftToRight.put(pair.source, pair.target);
if (isPrefix(collationLeftPrj, joinInfo.leftKeys)) { // preserve
collation
Review comment:
Commons.isPrefix and Commons.maxPrefix creates a HashSet with boxed
values underneath.
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