SQL based blocking and distance functions about zingg

[sonalgoyal]

Let us discuss this @navinrathore

[sonalgoyal]

We can have two files blockingFunctions.txt and similarityFubctions.txt. Each contains multiple functions as sql

blocking file has name of function followed by input column type and output column type and Sql. The from clauses have same name as name of the data in config
NameFn: string, string
Select name from test;

similarly other functions

similarity functions always return double but

[sonalgoyal]

--blockingFunctions, --similarityFunctions with location to file

[sonalgoyal]

• all work to be done in the new branch.
• take flags --blockingFunctions, --simlarityFunctions in ClientOptions and Arguments and Client
• parse and set the right value in above
• define the yml for blocking functions, also take care of linking etc (Sonal)
• define blocking function interface (Sonal)
• figure out which lib etc to use for parsing the yml, possibly Jackson
• read the yml and build the blocking functions as per the interface
• register the hash functions in the registry
• build blocking tree(Sonal)
• test(Sonal/Navin)