Resolve Errors Reading JSON Data in Amazon Athena
To remedy NULL or incorrect data errors, check the following common issues:
Use the correct JSON SerDe with Amazon Athena to read your data
Athena is able to read JSON data using one of two JSON SerDes:
- The native Hive / HCatalog JsonSerDe (org.apache.hive.hcatalog.data.JsonSerDe)
- The OpenX SerDe (org.openx.data.jsonserde.JsonSerDe)
If you're not sure which SerDE you used, try both of the available SerDE versions.
Be sure your JSON record is on a single line
Athena doesn't currently support multi-line JSON records.
Generate your data with case-insensitive columns
Athena is case-insensitive, so if you have column names that differ only by case (for example, “Column” and “column”), Athena generates an error, and your data will not be visible in Athena.
Provide an option to ignore malformed records
If you use the “org.openx.data.jsonserde.JsonSerDe” SerDe, you can provide an option to ignore malformed records. This will return malformed records as NULL:
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