Make the useLegacySql option configurable (#27)

lib/req_bigquery.ex

@@ -10,9 +10,10 @@ defmodule ReqBigQuery do
   alias Req.Request
   alias ReqBigQuery.Result
 
-  @allowed_options ~w(goth default_dataset_id project_id bigquery max_results)a
+  @allowed_options ~w(goth default_dataset_id project_id bigquery max_results use_legacy_sql)a
   @base_url "https://bigquery.googleapis.com/bigquery/v2"
   @max_results 10_000
+  @use_legacy_sql false
 
   @doc """
   Attaches to Req request.
@@ -35,6 +36,10 @@ defmodule ReqBigQuery do
       The rows Stream can make multiple requests if `num_rows` returned is grather than `:max_results`.
       Defaults to 10000.
 
+    * `:use_legacy_sql` - Optional. Specifies whether to use BigQuery's legacy SQL dialect for this query.
+      If set to false, the query will use BigQuery's GoogleSQL: https://cloud.google.com/bigquery/sql-reference/
+      The default value is false.
+
   If you want to set any of these options when attaching the plugin, pass them as the second argument.
 
   ## Examples
@@ -108,6 +113,7 @@ defmodule ReqBigQuery do
       options
       |> Keyword.put_new(:base_url, @base_url)
       |> Keyword.put_new(:max_results, @max_results)
+      |> Keyword.put_new(:use_legacy_sql, @use_legacy_sql)
 
     request
     |> Request.prepend_request_steps(bigquery_run: &run/1)
@@ -127,7 +133,7 @@ defmodule ReqBigQuery do
         query
         |> build_request_body(options[:default_dataset_id])
         |> Map.put(:maxResults, options[:max_results])
-        |> Map.put(:useLegacySql, false)
+        |> Map.put(:useLegacySql, options[:use_legacy_sql])
 
       %{request | url: uri}
       |> Request.merge_options(auth: {:bearer, token}, json: json)

test/req_bigquery_test.exs

@@ -19,7 +19,7 @@ defmodule ReqBigQueryTest do
                "defaultDataset" => %{"datasetId" => "my_awesome_dataset"},
                "query" => "select * from iris",
                "maxResults" => 10000,
-               "useLegacySql" => false
+               "useLegacySql" => true
              }
 
       assert URI.to_string(request.url) ==
@@ -50,7 +50,8 @@ defmodule ReqBigQueryTest do
     opts = [
       goth: ctx.test,
       project_id: "my_awesome_project_id",
-      default_dataset_id: "my_awesome_dataset"
+      default_dataset_id: "my_awesome_dataset",
+      use_legacy_sql: true
     ]
 
     assert response =