clintropolis commented on a change in pull request #8209: add mechanism to
control filter optimization in historical query processing
URL: https://github.com/apache/incubator-druid/pull/8209#discussion_r312215238
##########
File path:
processing/src/main/java/org/apache/druid/segment/filter/Filters.java
##########
@@ -654,27 +654,29 @@ private static void generateAllCombinations(
}
/**
- * This method provides a "standard" implementation of {@link
Filter#shouldUseIndex(BitmapIndexSelector)} which takes
+ * This method provides a "standard" implementation of {@link
Filter#shouldUseBitmapIndex(BitmapIndexSelector)} which takes
* a {@link Filter}, a {@link BitmapIndexSelector}, and {@link FilterTuning}
to determine if:
- * a) the filter supports bitmap indexes
+ * a) the filter supports bitmap indexes for all required columns
* b) the filter tuning specifies that it should use the index
* c) the cardinality of the column is above the minimum threshold and
below the maximum threshold to use the index
*
* If all these things are true, {@link
org.apache.druid.segment.QueryableIndexStorageAdapter} will utilize the
* indexes.
*/
- public static boolean shouldUseIndex(
+ public static boolean shouldUseBitmapIndex(
Filter filter,
BitmapIndexSelector indexSelector,
@Nullable FilterTuning filterTuning
)
{
final FilterTuning tuning = filterTuning != null ? filterTuning :
FilterTuning.createDefault(filter, indexSelector);
- if (filter.supportsBitmapIndex(indexSelector) && tuning.getUseIndex()) {
+ if (filter.supportsBitmapIndex(indexSelector) &&
tuning.getUseBitmapIndex()) {
return filter.getRequiredColumns().stream().allMatch(column -> {
- final int cardinality =
indexSelector.getBitmapIndex(column).getCardinality();
- return cardinality >= tuning.getUseIndexMinCardinalityThreshold()
- && cardinality <= tuning.getUseIndexMaxCardinalityThreshold();
+ final BitmapIndex index = indexSelector.getBitmapIndex(column);
+ Preconditions.checkNotNull(index, "WTF?! column doesn't have a bitmap
index");
Review comment:
changed
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