jixuan1989 commented on a change in pull request #2571:
URL: https://github.com/apache/iotdb/pull/2571#discussion_r565875861
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File path: server/src/main/java/org/apache/iotdb/db/service/TSServiceImpl.java
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@@ -668,6 +666,23 @@ private TSExecuteStatementResp
internalExecuteQueryStatement(String statement, l
}
}
+ /*
+ calculate fetch size for group by time plan
+ */
+ private int getFetchSizeForGroupByTimePlan(GroupByTimePlan groupByTimePlan) {
+ int rows = (int) ((groupByTimePlan.getEndTime() -
groupByTimePlan.getStartTime()) / groupByTimePlan
+ .getInterval());
+ // edge case for group by months when starttime is in February
+ // ie. time range = [2020-02-02, 2020-03-02), interval = 1mo, rows will
get 0
+ if (rows == 0 && groupByTimePlan.isIntervalByMonth()) {
+ Calendar calendar = Calendar.getInstance();
+ calendar.setTimeInMillis(groupByTimePlan.getStartTime());
+ calendar.add(Calendar.MONTH, (int) (groupByTimePlan.getInterval() /
MS_TO_MONTH));
+ rows = calendar.getTimeInMillis() <= groupByTimePlan.getEndTime() ? 1 :
0;
+ }
Review comment:
if rows==0 and !plan.isIntervalByMonth()
set rows = 1;
e.g., select avg(*) from root group by ( [now() -1h, now()), 7200s) will
return 1 row
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