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Update array_functions.md

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added note about ArrayElement index 0 case.
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Denis Zhuravlev 2019-09-05 19:36:34 -03:00 committed by GitHub
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docs/en/query_language/functions/array_functions.md
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@ -73,7 +73,7 @@ Get the element with the index `n` from the array `arr`. `n` must be any integer
Indexes in an array begin from one.
Negative indexes are supported. In this case, it selects the corresponding element numbered from the end. For example, `arr[-1]` is the last item in the array.
If the index falls outside of the bounds of an array, it returns some default value (0 for numbers, an empty string for strings, etc.).
If the index falls outside of the bounds of an array, it returns some default value (0 for numbers, an empty string for strings, etc.), except for the case with a non-constant array and a constant index of 0 (in this case there will be an error `Array indices are 1-based`).
## has(arr, elem)