jun-he opened a new issue #2569:
URL: https://github.com/apache/iceberg/issues/2569
```
sql("CREATE TABLE testTable (id bigint NOT NULL, ts timestamp, data
string) USING iceberg");
sql("ALTER TABLE testTable ADD PARTITION FIELD bucket(16, id)");
sql("ALTER TABLE testTable DROP PARTITION FIELD bucket(16, id)");
sql("ALTER TABLE testTable ADD PARTITION FIELD truncate(id, 4)");
sql("ALTER TABLE testTable DROP PARTITION FIELD truncate(id, 4)");
sql("ALTER TABLE testTable ADD PARTITION FIELD years(ts)");
```
will throw an error
```
java.lang.IllegalArgumentException: Multiple entries with same key: (1,
void)=1001: id_trunc_4: void(1) and (1, void)=1000: shard: void(1)
at
org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap.conflictException(ImmutableMap.java:214)
at
org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:208)
at
org.apache.iceberg.relocated.com.google.common.collect.RegularImmutableMap.checkNoConflictInKeyBucket(RegularImmutableMap.java:146)
at
org.apache.iceberg.relocated.com.google.common.collect.RegularImmutableMap.fromEntryArray(RegularImmutableMap.java:109)
at
org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:392)
at
org.apache.iceberg.BaseUpdatePartitionSpec.indexSpecByTransform(BaseUpdatePartitionSpec.java:296)
at
org.apache.iceberg.BaseUpdatePartitionSpec.<init>(BaseUpdatePartitionSpec.java:71)
......
```
When doing `indexSpecByTransform` within `BaseUpdatePartitionSpec`,
`VoidTransform` probably should be skipped.
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