wankai123 commented on issue #9472:
URL: https://github.com/apache/skywalking/issues/9472#issuecomment-1220382753
>`pg_locks_count.tag({tags -> tags.mode = tags.datname +
tags.mode}).sum(['mode' , 'server'])`
This expression should be correct, I have tried it in
https://github.com/apache/skywalking/blob/master/oap-server/analyzer/meter-analyzer/src/test/java/org/apache/skywalking/oap/meter/analyzer/dsl/AggregationTest.java.
``` java
{
"sum-by",
of("http_success_request", SampleFamilyBuilder.newBuilder(
Sample.builder().labels(of("idc",
"t1")).value(50).name("http_success_request").build(),
Sample.builder().labels(of("idc", "t3", "region", "cn",
"svc", "catalog")).value(50).name("http_success_request").build(),
Sample.builder().labels(of("idc", "t1", "region", "us",
"svc", "product")).value(50).name("http_success_request").build(),
Sample.builder().labels(of("idc", "t1", "region", "us",
"instance", "10.0.0.1")).name("http_success_request").value(50).build(),
Sample.builder().labels(of("idc", "t3", "region", "cn",
"instance", "10.0.0.1")).name("http_success_request").value(3).build()
).build()),
"http_success_request.tag({tags -> tags.idc = tags.idc +
tags.region }).sum(['region', 'idc'])",
Result.success(SampleFamilyBuilder.newBuilder(
Sample.builder().labels(of("idc", "t1", "region",
"")).value(50).name("http_success_request").build(),
Sample.builder().labels(of("idc", "t1", "region",
"us")).value(100).name("http_success_request").build(),
Sample.builder().labels(of("idc", "t3", "region",
"cn")).value(53).name("http_success_request").build()
).build()),
false,
}
```
the result is
```
<Result(success=true, isThrowable=false, error=null,
data=SampleFamily(samples=[Sample(name=http_success_request, labels={region=us,
idc=t1us}, value=100.0, timestamp=0), Sample(name=http_success_request,
labels={region=, idc=t1null}, value=50.0, timestamp=0),
Sample(name=http_success_request, labels={region=cn, idc=t3cn}, value=53.0,
timestamp=0)], context=SampleFamily.RunningContext(meterSamples=null,
histogramType=CUMULATIVE, defaultHistogramBucketUnit=SECONDS)))>
```
you could try it by yourself.
I think if the OAP receives nothing, you might need to check the other place.
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