Support real equalMatch in OAL core

[wu-sheng]

Discussed in #7517

^{Originally posted by 807801002 August 20, 2021}
Which field can be used at filter()？I thought all fields in org.apache.skywalking.oap.server.core.source.ServiceRelation can be used to the filter expression for "from(ServiceRelation.*)".But the "componentId == 7" is error. which is a field at ServiceRelation.

We have EqualMatch(function name, stringMatch), but this is for String type only. We should add a real equalMatch function in grammar tree and implementation in org.apache.skywalking.oap.server.core.analysis.metrics.expression.
Also, we should rename class EqualMatch to StringMatch.

[YczYanchengzhe]

I want to implement this by adding intmatch and wonder if it assign assigned to me

[kezhenxu94]

@YczYanchengzhe assigned, thanks

[YczYanchengzhe]

I encountered a problem.
After I completed the development and passed the unit test, I wanted to run the integration and found this error. The cause of the error was that the oal.core included parameter configuration could not be recognized. What could be the reason for this?

line 23:46 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 24:42 mismatched input '100' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 30:54 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 40:120 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 41:120 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 50:137 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 51:137 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 62:56 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 68:118 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}
line 73:69 extraneous input '10' expecting {')', BOOL_LITERAL, NUMBER_LITERAL, IDENTIFIER}

[YczYanchengzhe]

[wu-sheng]

You should change antlr file, and oal core to generate correct class codes. I am feeling you don't change them.