[GitHub] [iceberg] jun-he opened a new issue #2569: Error when dropping partition fields for the same source field more than once.

[GitBox <gi...@apache.org>]

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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