vinson0526 commented on a change in pull request #2691:
URL: https://github.com/apache/iceberg/pull/2691#discussion_r649020719
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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 cannot use constant name for removed field, because partition spec
field name must be unique.
Since removed field is not really used, we need to change it name to some
that not conflict with new field.
UUID cannot ensure generate unique.
field.fieldId() is unique, because we generate it from 1000 and
auto-increment for new field.
Maybe field.name() + field.fieldId() + UUID is better?
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