[jira] [Created] (FLINK-22405) Support fixed-lengh chars in the LeadLag built-in function

["Nico Kruber (Jira)" <ji...@apache.org>]

Nico Kruber created FLINK-22405:
-----------------------------------

             Summary: Support fixed-lengh chars in the LeadLag built-in function
                 Key: FLINK-22405
                 URL: https://issues.apache.org/jira/browse/FLINK-22405
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
    Affects Versions: 1.12.2
            Reporter: Nico Kruber


LeadLag aggregate function does not support type: ''CHAR'', as in the following example (a CAST to VARCHAR works around this). Technically, there should be no reason though to support STRING/VARCHAR but not CHAR:

{code:sql}
CREATE TEMPORARY VIEW test_cardinality AS
SELECT * FROM ( VALUES
  ('Alice', 'alice@test.com', ARRAY [ 'alice@test.com' ], 'Test Ltd'),
  ('Alice', 'alice@test.com', ARRAY [ 'alice@test.com' ], 'Test Ltd'),
  ('Alice', 'alice@test2.com', ARRAY [ 'alice@test.com', 'alice@test2.com' ], 'Test Ltd'))
AS t ( name, email, aliases, company );
{code}

{code:sql}
SELECT
  name,
  LEAD(company, 0) AS company
FROM test_cardinality
WHERE CARDINALITY(aliases) >= 2
GROUP BY name;
{code}



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