HIVE-27523 - Implement array_union UDF in Hive - #4513
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okumin
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Jul 24, 2023
| set hive.fetch.task.conversion=more; | ||
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| DESCRIBE FUNCTION array_union; | ||
| DESCRIBE FUNCTION EXTENDED array_union; |
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For our info: I ran some edge cases with Spark SQL
spark-sql (default)>
> SELECT array_union(array(1, 2, 3, null,3,4),array(1, 3, null));
[1,2,3,null,4]
spark-sql (default)> SELECT array_union(array(),array());
[]
spark-sql (default)> SELECT array_union(array(null),array(null));
[null]
spark-sql (default)> SELECT array_union(CAST(null AS ARRAY<INT>), CAST(null AS ARRAY<INT>));
NULL
spark-sql (default)> SELECT array_union(CAST(null AS ARRAY<INT>), ARRAY(1, 2));
NULL
spark-sql (default)> SELECT array_union(ARRAY(1, 2), CAST(null AS ARRAY<INT>));
NULL
| + " > SELECT _FUNC_(array(1, 2, 2,4), array(2,3)) FROM src LIMIT 1;\n" | ||
| + " [1,2,3,4]") | ||
| public class GenericUDFArrayUnion extends AbstractGenericUDFArrayBase { | ||
| static final int ARRAY2_IDX = 1; |
tarak271
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Dec 19, 2023
…Rama Rao Lethavadla, reviewed by Okumin, Sai Hemanth Gantasala)
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What changes were proposed in this pull request?
Implement array_union function in Hive
Why are the changes needed?
This enhancement is already implemented in Spark
Does this PR introduce any user-facing change?
No
Is the change a dependency upgrade?
No
How was this patch tested?
Created Junit tests as well as qtests as part of this change