kkhatua opened a new pull request #1787: DRILL-7203: Back button not working URL: https://github.com/apache/drill/pull/1787 The root cause of this bug is that when a form is submitted, Drill uses the POST mechanism via an AJAX call. The response is then used to swap the existing `/query` page's DOM. This means that the browser history does not capture the change because the URL has never changed. As a result, when the user hits the `[BACK]` button, the call is made to the browser which redirects to the last page visited just before `/query`. Changing the AJAX call mechanism is risky, so the workaround was to leverage the `sessionStorage` feature supported by most modern (and secure) browsers. When a query is submitted, `sessionStorage` is used to cache the submitted query (like a session/cookie). If the back button on the page is hit, an additional flag is set, telling the Javascript to revisit the submission page and use the _cached_ query. If the submission page is revisited via any other mechanism, it is assumed that the `[BACK]` button was not pressed (since the additional flag is not set), and the cached query is cleared from the browser memory.
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