Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
JSqlParser parses an SQL statement and translate it into a hierarchy of Java classes. The generated hierarchy can be navigated using the Visitor Pattern
JSqlParser.NET parses an SQL statement and translate it into a hierarchy of .NET classes. The generated hierarchy can be navigated using the Visitor Pattern
Dremio SQL(select) parser written with jison. Parse SQL into abstract syntax tree(AST) and stringify back to SQL. SQL grammar follows https://docs.dremio.com/sql-reference/