[jira] [Created] (CALCITE-2476) SqlAdvisor: lack of hints when sub-query has STAR (simplifySql produces 0 AS "*")

["Vladimir Sitnikov (JIRA)" <ji...@apache.org>]

Vladimir Sitnikov created CALCITE-2476:
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             Summary: SqlAdvisor: lack of hints when sub-query has STAR (simplifySql produces 0 AS "*")
                 Key: CALCITE-2476
                 URL: https://issues.apache.org/jira/browse/CALCITE-2476
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.17.0
            Reporter: Vladimir Sitnikov
            Assignee: Julian Hyde


{{SimpleSqlParser.purgeSelectExprsKeepAliases}} tries to replace expressions in {{select}} clause with aliases, and it often produces invalid SQL:

{{select * from dummy}} is replaced with {{select 0 AS "*" from dummy}} which is invalid
{{select a.x+ b.y from dummy}} is replaced with {{select 0 AS "b.y" from dummy}} and so on.

Testcase:
{code:sql}select ax^ from (select * from dummy a){code}

Actual output:
{code:sql}SELECT ax _suggest_ FROM ( SELECT 0 AS * FROM dummy a ){code}

I'm inclined to comment {{purgeSelectExprsKeepAliases}} out for now.





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