vlsi commented on a change in pull request #1910: [CALCITE-3915] Add rule
listener to report rule attempts and time at …
URL: https://github.com/apache/calcite/pull/1910#discussion_r409388114
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File path:
core/src/main/java/org/apache/calcite/plan/AbstractRelOptPlanner.java
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@@ -453,4 +467,63 @@ protected MulticastRelOptListener getListener() {
: Collections.singletonList(relType);
return Pair.of(digest, v);
}
+
+ /** Listener for counting the attempts of each rule. Only enabled under
DEBUG level.*/
+ private class RuleAttemptsListener implements RelOptListener {
+ private long beforeTimestamp;
+ private Map<String, Pair<Long, Long>> ruleAttempts;
+
+ RuleAttemptsListener() {
+ ruleAttempts = new HashMap<>();
+ }
+
+ @Override public void relEquivalenceFound(RelEquivalenceEvent event) {
+ }
+
+ @Override public void ruleAttempted(RuleAttemptedEvent event) {
+ if (event.isBefore()) {
+ this.beforeTimestamp = System.nanoTime();
+ } else {
+ long elapsed = (System.nanoTime() - this.beforeTimestamp) / 1000;
+ String rule = event.getRuleCall().getRule().toString();
+ if (ruleAttempts.containsKey(rule)) {
+ Pair<Long, Long> p = ruleAttempts.get(rule);
+ ruleAttempts.put(rule, Pair.of(p.left + 1, p.right + elapsed));
+ } else {
+ ruleAttempts.put(rule, Pair.of(1L, elapsed));
+ }
+ }
+ }
+
+ @Override public void ruleProductionSucceeded(RuleProductionEvent event) {
+ }
+
+ @Override public void relDiscarded(RelDiscardedEvent event) {
+ }
+
+ @Override public void relChosen(RelChosenEvent event) {
+ }
+
+ public String dump() {
+ // Sort rules by number of attempts
+ List<Map.Entry<String, Pair<Long, Long>>> list =
+ new ArrayList<>(this.ruleAttempts.entrySet());
+ Collections.sort(list,
+ (left, right) ->
right.getValue().left.compareTo(left.getValue().left));
+
+ // Print out rule attempts and time
+ StringBuilder sb = new StringBuilder();
+ sb.append(String
+ .format(Locale.ROOT, "%n%-60s%20s%20s%n", "Rules", "Attempts", "Time
(us)"));
Review comment:
I guess it would be easier to read if the numeric columns were the first
ones.
Does the number of attempts really need 20 characters?
Does the duration take 20 characters?
Can you please provide sample output?
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