I am trying to cast a variable type JSON field in Redshift Spectrum as a plane string but keep getting column type VARCHAR for column STRUCT is incompatible. Many web applications use JSON to transmit the application information. For example, commonly java applications often use JSON as a standard for data exchange. “Redshift Spectrum can directly query open file formats in Amazon S3 and data in Redshift in a … As a best practice to improve performance and lower costs, Amazon suggests using columnar data formats such as Apache Parquet . This post discusses which use cases can benefit from nested data types, how to use Amazon Redshift Spectrum with nested data types to achieve excellent performance and storage efficiency, and some of the limitations of nested data types. The first step in configuring the S3 Load component is to provide the Redshift table which the data in the S3 file is to be loaded into. Nested data support enables Redshift customers to directly query their nested data from Redshift through Spectrum. This approach works reasonably well for simple JSON documents. Example structure of the JSON file is: { message: 3 time: 1521488151 user: 39283 information: { bytes: 2342343 speed: 9392 location: CA } } The JSON file format is an alternative to XML. Customers already have nested data in their Amazon S3 data lake. Based on the demands of your queries, Redshift Spectrum can potentially use thousands of instances to take advantage of massively parallel processing. The JSON data I am trying to query has several fields which structure is fixed and expected. In this article, we will check how to export redshift data to json format with some examples. Amazon Redshift Array Support and Alternatives – Example; Redshift JSON_EXTRACT_PATH_TEXT Function. I am trying to use the copy command to load a bunch of JSON files on S3 to redshift. In this example we have a JSON file containing details of different types of donuts sold, a snippet of the file is below: Target Table. Redshift Spectrum also scales intelligently. This tutorial assumes that you know the basics of S3 and Redshift. The function JSON_EXTRACT_PATH_TEXT returns the value for the key:value pair referenced by a series of path elements in a JSON string. The JSON format is one of the widely used file formats to store data that you want to transmit to another server. Amazon Redshift Spectrum supports the following formats AVRO, PARQUET, TEXTFILE, SEQUENCEFILE, RCFILE, RegexSerDe, ORC, Grok, CSV, Ion, and JSON. Redshift Spectrum is a feature of Amazon Redshift that allows you to query data stored on Amazon S3 directly and supports nested data types. However, it gets difficult and very time consuming for more complex JSON data such as the one found in the Trello JSON. It is recommended by Amazon to use columnar file format as it takes less storage space and process and filters data faster and we can always select only the columns required. Amazon Redshift Spectrum extends Redshift by offloading data to S3 for querying. Here is the most recent spectrum-s3.json ... You can also manually enter an IAM role if you don’t see it included the list (for example, if the IAM role hasn’t been created yet). When trying to query from Spectrum, however, it returns: Top level Ion/JSON structure must be an anonymous array if and only if serde property 'strip.outer.array' is set. Getting setup with Amazon Redshift Spectrum is quick and easy. The given JSON path can be nested up to five levels. Redshift Spectrum does not have the limitations of the native Redshift SQL extensions for JSON. You create Redshift Spectrum tables by defining the structure for your files and registering them as tables in an external data catalog. 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