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The current query should look like in the following:
Remark: The image above is only true for older versions. In the current release, only nexmark:person is diplayed.
Here you can see, that there is a difference between the logical query (in PQL) and the real physical query. The logical has only one operator, the phyiscal three.
- nexmark:person: Is the access operator that is connected to the source.
MetadataCreatonPO: appends to each event the empty metadata object that is necessary for processing (e.g. timestamps)ApplicationTime: uses the information from the schema description. In this case you can see (if you look at the table above) that it updates the starttimestamp of each element. the first column contains the timestamp that is delivered from the nexmark-server and the last column contains the updated interval (the end timestamp is still on infinity)
You can right click on each operator in the view to see the data that this operator is currently processing. If you choose the values from MetadataCreationPO the output will be similar to the following, where you can see, that no metadata is set.
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