[jira] [Created] (DRILL-6361) Provide a dataTypeOf() or modeOf() function

["Paul Rogers (JIRA)" <ji...@apache.org>]

Paul Rogers created DRILL-6361:
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             Summary: Provide a dataTypeOf() or modeOf() function
                 Key: DRILL-6361
                 URL: https://issues.apache.org/jira/browse/DRILL-6361
             Project: Apache Drill
          Issue Type: Improvement
    Affects Versions: 1.13.0
            Reporter: Paul Rogers


Drill provides a {{typeof()}} function to return the type of a column. The returned string, however, has only the base data type. A Drill data type (a "major type") also includes a cardinality (a "mode"). For example, {{Optional Int}} or {{Required VarChar}}.

This type information is useful for handling data conversions. For example, if I could tell that a column value was a {{Nullable Int}}, I could guess that it is one Drill invented, and I could merge it, by hand, with the type from another file that had actual values.

The two options are equivalent. Either provide a {{modeOf()}} to just return cardinality, or a {{dataTypeOf()}} that returns both. (Maybe the {{modeOf()}} might be more useful.)



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