foxtail463 commented on code in PR #64032:
URL: https://github.com/apache/doris/pull/64032#discussion_r3433454735
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fe/fe-core/src/main/java/org/apache/doris/catalog/OlapTable.java:
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@@ -1908,6 +1908,29 @@ public long getRowCountForPartitionIndex(long
partitionId, long indexId, boolean
return index.getRowCount() == -1 ? 0 : index.getRowCount();
}
+ /**
+ * Returns row count for selected partitions on the given index. If some
partition row counts
+ * are not reported, estimate them from the base row count.
+ */
+ public double getRowCountForSelectedPartitions(Collection<Long>
selectedPartitionIds,
+ long indexId, double baseRowCount) {
+ double unknownPartitionCount = 0;
+ double selectedPartitionRowCount = 0;
+ for (long partitionId : selectedPartitionIds) {
+ long partitionRowCount = getRowCountForPartitionIndex(partitionId,
indexId, true);
+ if (partitionRowCount == UNKNOWN_ROW_COUNT) {
+ unknownPartitionCount++;
+ } else {
+ selectedPartitionRowCount += partitionRowCount;
+ }
+ }
+ if (unknownPartitionCount > 0) {
+ selectedPartitionRowCount += Math.max(unknownPartitionCount,
+ baseRowCount * unknownPartitionCount / getPartitionNum());
+ }
+ return selectedPartitionRowCount;
Review Comment:
if (unknownPartitionCount > 0) {
double knownSelectedPartitionCount = selectedPartitionIds.size()
- unknownPartitionCount;
double remainingPartitionCount = getPartitionNum() -
knownSelectedPartitionCount;
double remainingRowCount = Math.max(0, baseRowCount -
selectedPartitionRowCount);
selectedPartitionRowCount += remainingRowCount *
unknownPartitionCount / remainingPartitionCount;
}
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