NewInferrer infers information about a query by running the query on Postgres and extracting information from the catalog tables.

select statement with a limit.

update, insert, or delete statement.

select statement.

InputParam is an input parameter for a prepared query.

OutputColumn is a single column output from a select query or returning clause in an update, insert, or delete query.

Plan is the plan output from an EXPLAIN query.

TypedQuery is an enriched form of ast.SourceQuery after running it on Postgres to get information about the ast.SourceQuery.

PlanType is the top-level node plan type that Postgres plans for executing query.