add token & basic auth support for flightsql endpoint (#318)

required to enable SSL in grafana's flightsql plugin

README.md

@@ -341,6 +341,10 @@ produced by `columnq` into different formats based on client request.
 
 Building ROAPI with `simd` optimization requires nightly rust toolchain.
 
+### Debug
+
+To log all FlightSQL requests in console, set `RUST_LOG=tower_http=trace`.
+
 ### Build Docker image
 
 ```bash

columnq/src/columnq.rs

@@ -1,6 +1,5 @@
 use std::collections::hash_map::Entry;
 use std::collections::HashMap;
-use std::convert::TryFrom;
 use std::sync::Arc;
 
 use datafusion::arrow;

columnq/src/encoding/mod.rs

@@ -1,5 +1,4 @@
 use serde_derive::Deserialize;
-use std::convert::TryFrom;
 
 #[derive(Deserialize, Default, Clone, Copy)]
 pub enum ContentType {

columnq/src/io/mod.rs

@@ -1,5 +1,3 @@
-use std::convert::TryFrom;
-
 use snafu::prelude::*;
 
 pub mod fs;

columnq/src/io/object_store.rs

@@ -2,7 +2,6 @@ use crate::table::TableSource;
 use futures::TryStreamExt;
 use log::debug;
 use object_store::ObjectStore;
-use percent_encoding;
 use snafu::prelude::*;
 use std::str::FromStr;
 use std::sync::Arc;

columnq/src/query/graphql.rs

@@ -1,5 +1,3 @@
-use std::convert::TryFrom;
-
 use datafusion::arrow;
 use datafusion::logical_expr::Operator;
 use datafusion::prelude::{binary_expr, Column, Expr};