[jira] [Created] (HIVE-15583) CTAS query removes leading underscore from column names with CBO

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

Jesus Camacho Rodriguez created HIVE-15583:
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             Summary: CTAS query removes leading underscore from column names with CBO
                 Key: HIVE-15583
                 URL: https://issues.apache.org/jira/browse/HIVE-15583
             Project: Hive
          Issue Type: Bug
          Components: CBO
    Affects Versions: 2.2.0
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez
            Priority: Minor


L209 in PlanModifierForASTConv.java:

{code:java}
      if (colAlias.startsWith("_")) {
        colAlias = colAlias.substring(1);
        colAlias = getNewColAlias(newSelAliases, colAlias);
      }
{code}

I would like to explore if we can just remove this limitation.

For instance, due to this issue, when we create a table with Druid storage handler, we need to add an additional underscore for column names as Druid is expecting columns with a certain name.



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