AngersZhuuuu commented on pull request #30243:
URL: https://github.com/apache/spark/pull/30243#issuecomment-729446492


   > When I only read the first description, the behavior is unknown regarding 
what `contains_array` mean like the following cases
   > 
   > * `array_contains_array(array(1, 2, 3), array(3, 4))`
   > * `array_contains_array(array(1, 2, 3), array(1, 2))` derived from 
[prestosql/presto#5593](https://github.com/prestosql/presto/pull/5593)
   > * `array_contains_array(array(1, 2, 3), array(1, 3))` derived from 
[prestosql/presto#5593](https://github.com/prestosql/presto/pull/5593)
   
   Updated, presto is a litter different,  it judge if the array is a slice of  
other array.


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