[jira] [Created] (FLINK-27891) Add ARRAY_APPEND and ARRAY_PREPEND supported in SQL & Table API

["Sergey Nuyanzin (Jira)" <ji...@apache.org>]

Sergey Nuyanzin created FLINK-27891:
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             Summary: Add ARRAY_APPEND and ARRAY_PREPEND supported in SQL & Table API
                 Key: FLINK-27891
                 URL: https://issues.apache.org/jira/browse/FLINK-27891
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
            Reporter: Sergey Nuyanzin


{{ARRAY_APPEND}} - adds element to the end of the array and returns the resulting array
{{ARRAY_PREPEND}} - adds element to the beginning of the array and returns the resulting array

Syntax:

{code:sql}
ARRAY_APPEND( <array> , <new_element> );
ARRAY_PREPEND( <new_element> , <array> );
{code}

Arguments:

    array: An ARRAY to to add a new element.

    new_element: A new element.

Returns:

An array. If array is NULL, the result is NULL.

Examples:
{code:sql}
SELECT array_append(array[1, 2, 3], 4);
-- array[1, 2, 3, 4]
select array_append(cast(null as int array), 2);
-- null
SELECT array_prepend(array[1, 2, 3], 4);
-- array[4, 1, 2, 3]
SELECT array_prepend(array[1, 2, 3], null);
-- array[null, 1, 2, 3]
{code}

See more:
{{ARRAY_APPEND}}
   Snowflake https://docs.snowflake.com/en/sql-reference/functions/array_append.html
   PostgreSQL https://www.postgresql.org/docs/14/functions-array.html#ARRAY-FUNCTIONS-TABLE
{{ARRAY_PREPEND}}
   Snowflake https://docs.snowflake.com/en/sql-reference/functions/array_prepend.html
   PostgreSQL https://www.postgresql.org/docs/14/functions-array.html#ARRAY-FUNCTIONS-TABLE



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