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Doc: Do Not Modify the Source Data Table During MergeIntoCommand Exec… #11787

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Doc: Do Not Modify the Source Data Table During MergeIntoCommand Exec… #11787

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Doc: Do Not Modify the Source Data Table During MergeIntoCommand Exec…
BsoBird Dec 14, 2024
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Update spark-writes.md
BsoBird Dec 16, 2024
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BsoBird Dec 20, 2024
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3 changes: 3 additions & 0 deletions docs/docs/spark-writes.md
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Expand Up @@ -101,6 +101,9 @@ Spark 3.5 added support for `WHEN NOT MATCHED BY SOURCE ... THEN ...` to update
WHEN NOT MATCHED BY SOURCE THEN UPDATE SET status = 'invalid'
```

!!! danger
Note: For copy on write table,if source data table is not iceberg table,Please Do Not Modify the Source Data Table During Execution(For example:hive table,jdbc view table,another datalake table,etc.).Due to the need for Spark to use the source table consecutively twice for computation,the relation which is created of source data must remain constant through the two different passes of the source data.If the source data query would return different results user will see odd behavior(For example: data loss).

### `INSERT OVERWRITE`

`INSERT OVERWRITE` can replace data in the table with the result of a query. Overwrites are atomic operations for Iceberg tables.
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