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# frozen_string_literal: true
require "cases/helper"
require "models/post"
if supports_optimizer_hints?
class PostgresqlOptimzerHintsTest < ActiveRecord::PostgreSQLTestCase
fixtures :posts
def setup
enable_extension!("pg_hint_plan", ActiveRecord::Base.connection)
end
def test_optimizer_hints
assert_sql(%r{\ASELECT /\*\+ SeqScan\(posts\) \*/}) do
posts = Post.optimizer_hints("SeqScan(posts)")
posts = posts.select(:id).where(author_id: [0, 1])
assert_includes posts.explain, "Seq Scan on posts"
end
end
def test_optimizer_hints_with_count_subquery
assert_sql(%r{\ASELECT /\*\+ SeqScan\(posts\) \*/}) do
posts = Post.optimizer_hints("SeqScan(posts)")
posts = posts.select(:id).where(author_id: [0, 1]).limit(5)
assert_equal 5, posts.count
end
end
def test_optimizer_hints_is_sanitized
assert_sql(%r{\ASELECT /\*\+ SeqScan\(posts\) \*/}) do
posts = Post.optimizer_hints("/*+ SeqScan(posts) */")
posts = posts.select(:id).where(author_id: [0, 1])
assert_includes posts.explain, "Seq Scan on posts"
end
assert_sql(%r{\ASELECT /\*\+ "posts"\.\*, \*/}) do
posts = Post.optimizer_hints("**// \"posts\".*, //**")
posts = posts.select(:id).where(author_id: [0, 1])
assert_equal({ "id" => 1 }, posts.first.as_json)
end
end
def test_optimizer_hints_with_unscope
assert_sql(%r{\ASELECT "posts"\."id"}) do
posts = Post.optimizer_hints("/*+ SeqScan(posts) */")
posts = posts.select(:id).where(author_id: [0, 1])
posts.unscope(:optimizer_hints).load
end
end
end
end
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