[GitHub] [iceberg] RussellSpitzer commented on a diff in pull request #6163: Core: Method for building common partition type

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

RussellSpitzer commented on code in PR #6163:
URL: https://github.com/apache/iceberg/pull/6163#discussion_r1018462633


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core/src/main/java/org/apache/iceberg/Partitioning.java:
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@@ -195,41 +198,68 @@ public Void alwaysNull(int fieldId, String sourceName, int sourceId) {
   }
 
   /**
-   * Builds a common partition type for all specs in a table.
+   * Builds an intersection of all partition types in a table.
    *
-   * <p>Whenever a table has multiple specs, the partition type is a struct containing all columns
-   * that have ever been a part of any spec in the table.
+   * <p>Whenever a table has multiple specs, the common partition type is a struct containing only
+   * fields that are present in every spec of the table. In other words, the struct fields represent
+   * an intersection of all partition types.

Review Comment:
   Empty struct if we have no common partitionType?



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