By default, Amazon Redshift creates external tables with the pseudocolumns $path and $size. You can disable creation of pseudocolumns for a session by setting the spectrum_enable_pseudo_columns configuration parameter to false. For more information, see Pseudocolumns.
If you're like us, you probably have a lot of data that is only accessible from your private network. This is why we built the on-prem version of Retool. However, not everyone can hop into their AWS console and fire up a new Ubuntu box. Perhaps this requires official approval, or maybe it's just a m...
Dec 12, 2013 · Expanding JSON arrays to rows with SQL on RedShift. 12 December 2013 — Torsten Becker . Amazon's RedShift is a really neat product that solves a lot of our problems at work. However, its SQL dialect has some limitations when compared to Hive or PostgresSQL. I hit a limit when I needed table-generating functions but found a work-around.
Apr 24, 2020 · We can check ‘Use Url’ if Json file need to be fetched from any website else keep it uncheck. ‘Loop Json query’ is appearing because we have selected ‘JsonPath’ in ‘Read By’ property above, it will have path of tabs in file, please see Json file before this. In the ‘book’ tag we have 4 attributes which needs to be extracted.
Amazon Redshift doesn't support any JSONPath elements, such as wildcard characters or filter expressions, that might resolve to an ambiguous path or multiple name elements. As a result, Amazon Redshift can't parse complex, multi-level data structures.
Apr 10, 2018 · Key-value style in Amazon Redshift maybe can be used for some cases and scenarios, it uses an extra column compared to json and the concatenated version and much more records. Below is the DDL to flatten the data for key-value:
path (will use '/' if not given) body (will use '' if not given) service (will be calculated from hostname or host if not given) region (will be calculated from hostname or host or use 'us-east-1' if not given) headers['Host'] (will use hostname or host or be calculated if not given)