cgivre commented on issue #1539: DRILL-6847: Add Query Metadata to RESTful Interface URL: https://github.com/apache/drill/pull/1539#issuecomment-439064781 HI @kkhatua A few things. First re: breaking backward compatibility. Since the RESTful interface returns JSON KV pairs, and since all this is doing is introducing an additional key (metadata) which contains the column types, I don't think it will break anything since it isn't doing anything to the existing keys. No real way to know unless a lot of people complain, but the tools which I use that use the RESTful interface are not affected. Secondly, regarding star queries, I did try a few on my local machine and you get a dump of all the column types. IE if your data contains 4 columns and you do a `SELECT *` you get: ``` "metadata": [ "INT", "VARCHAR", "VARCHAR", "VARCHAR" ], ``` Since this code gets called when results are returned, I don't think schema inconsistencies matter. IE if the query fails due to schema inconsistencies, you won't get metadata, and if it succeeds you get the results. @arina-ielchiieva Would you like to see additional arrays with precision and scale with null values if it is not needed. IE ``` "scale": [ 4, null, null, null ] ```
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