morrySnow commented on code in PR #10170:
URL: https://github.com/apache/doris/pull/10170#discussion_r994342637
##########
fe/fe-core/src/main/java/org/apache/doris/planner/OlapScanNode.java:
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@@ -756,6 +763,79 @@ private void getScanRangeLocations() throws UserException {
LOG.debug("distribution prune cost: {} ms",
(System.currentTimeMillis() - start));
}
+ /**
+ * First, determine how many rows to sample from each partition according
to the number of partitions.
+ * Then determine the number of Tablets to be selected for each partition
according to the average number
+ * of rows of Tablet,
+ * If seek is not specified, the specified number of Tablets are
pseudo-randomly selected from each partition.
+ * If seek is specified, it will be selected sequentially from the seek
tablet of the partition.
+ * And add the manually specified Tablet id to the selected Tablet.
+ * simpleTabletNums = simpleRows / partitionNums / (partitionRows /
partitionTabletNums)
+ */
+ public void computeSampleTabletIds() {
+ if (desc.getSampleTabletIds() != null) {
Review Comment:
why not get sample info from TableRef dierctly?
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