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Update nested-columns.md

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Jill Osborne 2022-11-28 11:22:06 +00:00 committed by GitHub
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docs/querying/nested-columns.md
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## Ingest a JSON string as COMPLEX<json\>
If your source data uses a string representation of your JSON column, you can still ingest the data as `COMPLEX<JSON>` as follows:
If your source data contains serialized JSON strings, you can ingest the data as `COMPLEX<JSON>` as follows:
- During native batch ingestion, call the `parse_json` function in a `transform` object in the `transformSpec`.
- During SQL-based ingestion, use the PARSE_JSON keyword within your SELECT statement to transform the string values to JSON.
- If you are concerned that your data may not contain valid JSON, you can use `try_parse_json` for native batch or `TRY_PARSE_JSON` for SQL-based ingestion. For cases where the column does not contain valid JSON, Druid inserts a null value.