Serge Rielau created SPARK-44840:
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Summary: array_insert() give wrong results for ngative index
Key: SPARK-44840
URL: https://issues.apache.org/jira/browse/SPARK-44840
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 3.4.0
Reporter: Serge Rielau
Unlike in Snowflake we decided that array_inert() is 1 based.
This means 1 is the first element in an array and -1 is the last.
This matches the behavior of functions such as substr() and element_at().
{code:java}
> SELECT array_insert(array('a', 'b', 'c'), 1, 'z');
["z","a","b","c"]
> SELECT array_insert(array('a', 'b', 'c'), 0, 'z');
Error
> SELECT array_insert(array('a', 'b', 'c'), -1, 'z');
["a","b","c","z"]
> SELECT array_insert(array('a', 'b', 'c'), 5, 'z');
["a","b","c",NULL,"z"]
> SELECT array_insert(array('a', 'b', 'c'), -5, 'z');
["z",NULL,"a","b","c"]
> SELECT array_insert(array('a', 'b', 'c'), 2, cast(NULL AS STRING));
["a",NULL,"b","c"]
{code}
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