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Update Delta uniform documentation to include ALTER enabling - 3.3 #3963

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Dec 19, 2024
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Update Delta uniform documentation to include ALTER enabling - 3.3 #3963

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16 changes: 14 additions & 2 deletions docs/source/delta-uniform.md
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Original file line number Diff line number Diff line change
Expand Up @@ -61,13 +61,25 @@ CREATE TABLE T(c1 INT) USING DELTA TBLPROPERTIES(
'delta.universalFormat.enabledFormats' = 'iceberg');
```

You can enable UniForm Iceberg on an existing table using the following syntax:
In Delta 3.3 and above, you can enable or upgrade UniForm Iceberg on an existing table using the following syntax:

```sql
ALTER TABLE table_name SET TBLPROPERTIES(
'delta.enableIcebergCompatV2' = 'true',
'delta.universalFormat.enabledFormats' = 'iceberg');
```

You can also use REORG to enable UniForm Iceberg and rewrite underlying data files, as in the following example:

```sql
REORG TABLE table_name APPLY (UPGRADE UNIFORM(ICEBERG_COMPAT_VERSION=2));
```

Use REORG if any of following are true:
* Your table has deletion vectors enabled.
* You previously enabled the IcebergCompatV1 version of UniForm Iceberg.
* You need to read from Iceberg engines that don't support Hive-style Parquet files, such as Athena or Redshift.

You can enable UniForm Hudi on an existing table using the following syntax:

```sql
Expand Down Expand Up @@ -156,4 +168,4 @@ The following <Delta> features work for Delta clients when UniForm is enabled, b
- Delta Sharing

.. <Delta> replace:: Delta Lake
.. <AS> replace:: Apache Spark
.. <AS> replace:: Apache Spark
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