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Document write mode options #19

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4 changes: 3 additions & 1 deletion README.md
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Expand Up @@ -40,8 +40,10 @@ Load data from Parquet to Iceberg File Catalog:
Supports standard AWS environment variables (e.g. AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_PROFILE, AWS_ENDPOINT etc).

Use the `file://` protocol to load data into a file instead.
Use `--overwrite` to overwrite existing table data
Use `--append` to append to an existing table

## Limitations

- Supported datatypes: bool, char, int2, int4, int8, float4, float8, timestamp, timestamptz, date, text, bytea. Cast the columns in your query to `text` or another supported type if your query returns different types
- Doesn't support appending to tables, only writing new Delta Tables (pass `-o` to overwrite)
- Append is not supported for Delta tables