vinson0526 commented on a change in pull request #2691:
URL: https://github.com/apache/iceberg/pull/2691#discussion_r651004064
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File path: core/src/main/java/org/apache/iceberg/BaseUpdatePartitionSpec.java
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@@ -223,7 +223,9 @@ public PartitionSpec apply() {
// field IDs were not required for v1 and were assigned sequentially
in each partition spec starting at 1,000.
// to maintain consistent field ids across partition specs in v1
tables, any partition field that is removed
// must be replaced with a null transform. null values are always
allowed in partition data.
- builder.add(field.sourceId(), field.fieldId(), field.name(),
Transforms.alwaysNull());
+ // To avoid name conflict when add and remove same partition transform
multiple times, field name will be
+ // replaced by field name append with field id.
+ builder.add(field.sourceId(), field.fieldId(), field.name() + "_" +
field.fieldId(), Transforms.alwaysNull());
Review comment:
We have two choice when a a conflict is detected:
1. to rename the existing void transform, that will significant add
complexity to [the check
method](https://github.com/apache/iceberg/blob/35691728df3b6930045271b1e5663c8516b52301/api/src/main/java/org/apache/iceberg/PartitionSpec.java#L339),
just to find which void transform conflict with the current added transform.
2. to rename the new transform, that will either broke default partition
name consistency, or change the name assigned by user
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