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Allow adding a partition field with the name of a removed one - #4307
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update_spec().remove_field(name).add_field(..., name) raised "Cannot add duplicate partition field name" because add_field checked whether the new field's id was being removed instead of the existing field's id. Replacing a partition field while keeping its name, for example to change the number of buckets, works in Java. Check the existing field instead, and on v1 tables rename the removed field, which stays in the spec as a void transform, to name_<field id> as Java does.
Fokko
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Nov 10, 2026
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Nice fix! 🙌 Checked against Java's BaseUpdatePartitionSpec.addField and the void-transform rename on v1 matches. Verified the test fails on main and passes here. Thanks @sohailshk!
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Closes #4306
Rationale for this change
update_spec().remove_field(name).add_field(..., name)raisedCannot add duplicate partition field namebecauseadd_fieldchecked whether the new field's id was being removed instead of the existing field's id. Replacing a partition field while keeping its name, for example to change the number of buckets, works in Java (BaseUpdatePartitionSpec.addField).This checks the existing field instead. On v1 tables the removed field stays in the spec as a void transform, so it is renamed to
<name>_<fieldId>, as Java does.Are these changes tested?
Yes:
test_update_spec_remove_and_add_field_with_same_nameintests/table/test_init.pyreplaces a bucket field with a new one of the same name on v1 and v2 tables and checks the resulting spec (on v1 the removed field becomesy_shard_1001with a void transform). It fails onmainand passes with this change.tests/tableandtests/test_schema.py: 889 passed.ruff checkandruff format --check(0.14.3) pass on the changed files.Are there any user-facing changes?
Removing a partition field and adding a new one with the same name in one
update_spec()now works instead of raising.