xueyumusic opened a new pull request #7950: Add array_slice and array_unshift function expr URL: https://github.com/apache/incubator-druid/pull/7950 Recently druid introduces a group of array functions, such as `array_length`, `array_append` etc. This PR tried to add `array_slice` which returns a subarray of origin array and `array_unshift` which likes `array_append` but adds element at the first. These two functions are common functions in usage.
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