When parsing nested JSON in PySpark, you usually have to describe StructType within StructType within StructType. In the end, you get cumbersome, inflexible code that easily breaks down with any changes to the JSON structure.
In PySpark 4.0, the Variant type was introduced, which allows you to completely avoid describing the schema. Simply use parse_json() to load the data and variant_get() to extract values via JSONPath.
Key advantages:
• no need to describe the schema in advance
• any depth of nesting through simple syntax $.path
• changes to the schema don't break the code
• you extract only the necessary fields and only when they are really needed
Update your pipelines to PySpark 4.0:
pip install pyspark>=4.0
Article about PySpark 4.0, Run the code]
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