clairemcginty opened a new pull request, #39645:
URL: https://github.com/apache/beam/pull/39645

   I discovered when testing a snapshot of 
https://github.com/apache/beam/pull/39250 that _some properties_, like bloom 
filter enabling, were getting propagated, but non-Parquet-related properties, 
like `write.data.path`, were not.
   
   Root cause: writeProperties passed via 
`IcebergIO.writeRows().withWriteProperties(...)` were only forwarded to 
`Parquet.DataWriteBuilder.setAll()` in RecordWriter, but were never stored as 
Iceberg table properties. This means:
   
     - Parquet-level properties (e.g., 
write.parquet.bloom-filter-enabled.column.*) happened to work, because 
Iceberg's Parquet.WriteBuilder parses them from its internal config map 
(https://github.com/apache/iceberg/blob/main/parquet/src/main/java/org/apache/iceberg/parquet/Parquet.java#L650-L668)
 regardless of whether they came from table.properties() or a direct setAll() 
call.
     - Table-level properties (e.g., write.data.path, write.metadata.*) did not 
work, because they're read from table.properties() by Iceberg's 
LocationProvider and metadata machinery, not from the Parquet builder's config 
map.
   
   It turns out that Iceberg's forTable(table) 
(https://github.com/apache/iceberg/blob/main/parquet/src/main/java/org/apache/iceberg/parquet/Parquet.java#L905-L911)
 already calls setAll(table.properties()), loading all table properties into 
the builder's config. So the correct place to apply writeProperties is on the 
table itself, not as a second setAll() on the builder.
   
   This PR merges `writeProperties` into the table properties at creation time 
in both `RecordWriterManager.loadOrCreateTable()` and 
`WritePartitionedRowsToFiles.loadOrCreateTable()`.
   
   
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