JackieTien97 opened a new pull request #1341:
URL: https://github.com/apache/incubator-iotdb/pull/1341
The 'orderByHeatClause' is added to support this feature. The detailed
syntax is:
orderByHeatClause
: ORDER BY HEAT
;
It's an optional clause, if user doesn't specify it. The action of 'show
timeseries' will just be like before, the result set is sorted by the
registered time of the time series.
If it is specified, firstly we will obtain all the satisfying timeseries as
before, then we will sort them by the last point's timestamp. That means if the
timeseries is inserted recently, it will be shown in the front.
In the implementation, as we have got the LeafMNode before, so we can use
the cachedLastValuePair field in it to get last timestamp, if the
cachedLastValuePair is null, we will construct a LastQueryPlan to get it.
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