[GitHub] [datasketches-postgresql] chongdae commented on issue #35: Cannot buid sketches for empty set

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

chongdae commented on issue #35:
URL: https://github.com/apache/datasketches-postgresql/issues/35#issuecomment-767278269


   In datasketches-hive, null is treated as empty set.
   
   https://github.com/apache/datasketches-hive/blob/master/src/main/java/org/apache/datasketches/hive/theta/UnionSketchUDF.java
   
   In this case, `theta_sketch_union(null, null)` returns empty sketch, not `null`.
   


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