xinyiZzz commented on code in PR #10170:
URL: https://github.com/apache/doris/pull/10170#discussion_r982558867
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fe/fe-core/src/main/java/org/apache/doris/analysis/TupleDescriptor.java:
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@@ -159,6 +164,80 @@ public void setTable(TableIf tbl) {
table = tbl;
}
+ public Set<Long> getSampleTabletIds() {
+ return sampleTabletIds;
+ }
+
+ /**
+ * 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.
Review Comment:
The default seek 0, selects the first n tablets.
If the user wants to randomly sample multiple times, select different tablet
ids, and hope that the results of each random sampling can be reproduced, seek
is required.
If the seek is the same, the selected tablet is also the same.
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