JuliaCon 2017

Query is a package for querying julia data sources. Its role is similar to LINQ in C# and dplyr in R. It can filter, project, join and group data from any iterable data source. It has enhanced support for querying arrays, DataFrames, DataTables, TypedTables, IndexedTables and any DataStream source (e.g. CSV, Feather, SQLite etc.). The package also defines an interface for tabular data that allows a) dispatch on any tabular data source and b) simple conversions of tabular data representations. The talk will first introduce Query from a user perspective and highlight different examples of queries that the package makes feasible. The second half of the talk will dive deep into the internals of the package and explain the various extension points that package provides.