xephonhq / tsdb-ql Goto Github PK

• Sawzall

In Bigtable, google present a language called Sawzall which is client supplied but can be run on the address space of servers https://static.googleusercontent.com/media/research.google.com/en//archive/sawzall-sciprog.pdf

• https://github.com/Netflix/atlas/wiki/Stack-Language

Atlas Stack Language is designed to be a stable method of representing complex data queries in a URL-friendly format. It is loosely based on the RPN expressions supported by Tobias Oetiker's rrdtool. The following is an example of a stack language expression:

• http://plywood.imply.io/plyql a query language for druid
• http://juttle.github.io/ a pipe language for both querying and graphing
• https://vega.github.io/vega/ A Visualization Grammar (in JSON)
• https://github.com/ahmetb/go-linq LINQ in Golang
• ggplot2 http://ggplot2.org/ https://youtu.be/P8dc-rLnLr0?t=1h12m47s from Monitorama
• https://github.com/goby-lang/goby A new language helps you develop microservices

TSQL is already used by SQL server https://en.wikipedia.org/wiki/Transact-SQL . Maybe xephon-ql ....

Related pboyer/antlr4#93

Met this problem in 08e6f68

I think the problem might be the golang runtime, but it could also be mine, there is no doc for visitor pattern

• BaseParseTreeVisitor https://github.com/antlr/antlr4/blob/master/runtime/Go/antlr/tree.go#L67 does nothing but return nil
• ParseTreeVisitor got a TODO and commented out code https://github.com/antlr/antlr4/blob/master/runtime/Go/antlr/tree.go#L73

Conclusion

• the SIGSEGV is caused by embedding by pointer
• the Go runtime didn't implement visitor pattern

Related #3 pboyer/antlr4#93

Comparing the Java code and the Go runtime, the visit method should call tree.accept(visitor)

The code is in AbstractParseTreeVisitor.java

	public T visit(ParseTree tree) {
		return tree.accept(this);
	}

• The generated go code also have Accept methods in *_parser.go
• still didn't found where are testes for go except for this https://github.com/antlr/antlr4/blob/master/.travis/run-tests-go.sh