rumbin opened a new issue #4204: Add syntax highlighting for SQL expressions in Edit Table form URL: https://github.com/apache/incubator-superset/issues/4204 ### Feature Request There are several fields in the __Edit Table__ form that contain SQL expressions, namely * __Detail__ tab: __Sql__ and maybe(?) __Fetch Values Predicate__ * __List Columns__ tab: __Expression__ and __Database Expression__ * __List Metrics__ tab: __SQL Expression__ I think it would be very helpful if syntax highlighting and, most importantly, hinting for pairs of parentheses/brackets/braces would be available in these fields. Especially for more sophisticated metrics I often end up either counting the parentheses or pasting the code into an editor which shows which pair of parentheses is incomplete. Maybe an implementation in a similar way like the modal for the Markup slice would be possible? In this modal parentheses and braces get closed automatically and hints for corresponding pairs are given, as well (although a bit too faint in my eyes).
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