[jira] [Created] (CALCITE-5633) Allow table functions to be inside select list

[Dmitry Sysolyatin (Jira)]

Dmitry Sysolyatin created CALCITE-5633:
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             Summary: Allow table functions to be inside select list
                 Key: CALCITE-5633
                 URL: https://issues.apache.org/jira/browse/CALCITE-5633
             Project: Calcite
          Issue Type: Bug
    Affects Versions: 1.34.0
            Reporter: Dmitry Sysolyatin


Currently, it is impossible to use table functions inside select list.

For example:
{code}
SELECT UNNEST(ARRAY[1,2,3]);
{code}

{code}
SELECT table(generate_series(1,2)); // generate_series is user defined table 
function
{code}

Engines like PostgreSQL support it[1]:

{quote}Functions returning sets can also be called in the select list of a 
query. For each row that the query generates by itself, the set-returning 
function is invoked, and an output row is generated for each element of the 
function's result set
{quote}

[1] https://www.postgresql.org/docs/current/xfunc-sql.html




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