Constant CHECK_TABLE_PRIVILEGE_QUERY 

const CHECK_TABLE_PRIVILEGE_QUERY: &str = r#"
    SELECT
      current_user::text AS user_name,
      n.oid IS NOT NULL AS schema_exists,
      c.oid IS NOT NULL AS table_exists,
      COALESCE(has_schema_privilege(current_user, n.oid, 'USAGE'), false) AS has_schema_usage,
      COALESCE(has_table_privilege(current_user, c.oid, $3), false) AS has_table_privilege,
      COALESCE(has_any_column_privilege(current_user, c.oid, $3), false) AS has_any_column_privilege
    FROM (SELECT 1) AS one
    LEFT JOIN pg_namespace n ON n.nspname = $1
    LEFT JOIN pg_class c ON c.relnamespace = n.oid
      AND c.relname = $2
      AND c.relkind IN ('r', 'p')
    LIMIT 1
"#;