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https://issues.apache.org/jira/browse/FLINK-31098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17689678#comment-17689678
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Sergey Nuyanzin edited comment on FLINK-31098 at 2/16/23 10:25 AM:
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Do we really need {{ARRAY_SIZE}}?
I'm asking because there is already existing {{CARDINALITY}} which also gives
size of array or map and returns {{NULL}} for null input.
I would rather suggest something like {{ARRAY_LENGTH}} from postgres which
could return the size of the specified array dimension
{noformat}
array_length ( anyarray, integer ) → integer
Returns the length of the requested array dimension. (Produces NULL instead of
0 for empty or missing array dimensions.)
array_length(array[1,2,3], 1) → 3
array_length(array[]::int[], 1) → NULL
array_length(array['text'], 2) → NULL
{noformat}
https://www.postgresql.org/docs/current/functions-array.html#ARRAY-FUNCTIONS-TABLE
was (Author: sergey nuyanzin):
Do we really need {{ARRAY_SIZE}}?
I'm asking because there is already existing {{CARDINALITY}} which also gives
size of array or map and returns {{NULL}} for null input.
> Add ARRAY_SIZE supported in SQL & Table API
> -------------------------------------------
>
> Key: FLINK-31098
> URL: https://issues.apache.org/jira/browse/FLINK-31098
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Affects Versions: 1.18.0
> Reporter: jackylau
> Assignee: jackylau
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.18.0
>
>
> Returns the size of an array.
> Syntax:
> array_size(array)
> Arguments:
> array: An ARRAY to be handled.
> Returns:
> An ARRAY. If value is NULL, the result is NULL.
> Examples:
> {code:sql}
> SELECT array_size(ARRAY[1, 2, 3, 2, 1]);
> -- 5
> SELECT array_size(ARRAY[1, NULL, 1]);
> -- 3
> {code}
> See also
> spark [https://spark.apache.org/docs/latest/api/sql/index.html#array_size]
> snowflake https://docs.snowflake.com/en/sql-reference/functions/array_size
> h4.
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