szehon-ho commented on code in PR #4812:
URL: https://github.com/apache/iceberg/pull/4812#discussion_r940562715
##########
core/src/main/java/org/apache/iceberg/MetadataColumns.java:
##########
@@ -89,8 +92,15 @@ private MetadataColumns() {}
ROW_POSITION.fieldId(),
IS_DELETED.fieldId(),
SPEC_ID.fieldId(),
- PARTITION_COLUMN_ID);
+ PARTITION_COLUMN_ID,
Review Comment:
This is to avoid an issue when trying to read these constant columns via
Avro reader, which supports but only if they are defined in this set.
```
Caused by: java.lang.IllegalArgumentException: Missing required field:
partition
at
org.apache.iceberg.relocated.com.google.common.base.Preconditions.checkArgument(Preconditions.java:220)
at
org.apache.iceberg.avro.BuildAvroProjection.record(BuildAvroProjection.java:104)
at
org.apache.iceberg.avro.BuildAvroProjection.record(BuildAvroProjection.java:42)
at
org.apache.iceberg.avro.AvroCustomOrderSchemaVisitor.visit(AvroCustomOrderSchemaVisitor.java:50)
at
org.apache.iceberg.avro.AvroSchemaUtil.buildAvroProjection(AvroSchemaUtil.java:126)
at
org.apache.iceberg.avro.ProjectionDatumReader.setSchema(ProjectionDatumReader.java:68)
at
org.apache.avro.file.DataFileStream.initialize(DataFileStream.java:133)
at org.apache.avro.file.DataFileReader.<init>(DataFileReader.java:139)
at org.apache.avro.file.DataFileReader.<init>(DataFileReader.java:131)
at
org.apache.avro.file.DataFileReader.openReader(DataFileReader.java:75)
at
org.apache.iceberg.avro.AvroIterable.newFileReader(AvroIterable.java:100)
at org.apache.iceberg.avro.AvroIterable.iterator(AvroIterable.java:76)
at
org.apache.iceberg.io.CloseableIterable.lambda$filter$0(CloseableIterable.java:110)
at
org.apache.iceberg.io.CloseableIterable$2.iterator(CloseableIterable.java:72)
at
org.apache.iceberg.spark.source.RowDataReader.open(RowDataReader.java:61)
at
org.apache.iceberg.spark.source.RowDataReader.open(RowDataReader.java:38)
at org.apache.iceberg.spark.source.BaseReader.next(BaseReader.java:128)
at
org.apache.spark.sql.execution.datasources.v2.PartitionIterator.hasNext(DataSourceRDD.scala:119)
at
org.apache.spark.sql.execution.datasources.v2.MetricsIterator.hasNext(DataSourceRDD.scala:156)
at
org.apache.spark.sql.execution.datasources.v2.DataSourceRDD$$anon$1.$anonfun$hasNext$1(DataSourceRDD.scala:63)
at
org.apache.spark.sql.execution.datasources.v2.DataSourceRDD$$anon$1.$anonfun$hasNext$1$adapted(DataSourceRDD.scala:63)
```
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