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  1. Apache Drill
  2. DRILL-6768

Improve to_date, to_time and to_timestamp and corresponding cast functions to handle empty string when `drill.exec.functions.cast_empty_string_to_null` option is enabled

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.14.0
    • Fix Version/s: 1.15.0
    • Component/s: None

      Description

      When `drill.exec.functions.cast_empty_string_to_null` option is enabled

      `to_date`, `to_time` and `to_timestamp` functions while converting string to according type in case if null or empty string values are passed will return NULL (to avoid CASE clauses which are littering a query and will work in accordance with their respective CAST counterparts) for both cases.

       
       
       

      CASTs will  be handled in a similar way (uniformly with numeric types):

       

      Value to cast Now Will be
      NULL NULL NULL
      '' (empty string) Error in many cases (except numerical types) NULL

       CAST empty string to null (in case of enabled option) will be supported by DATE, TIME, TIMESTAMP, INTERVAL YEAR, INTERVAL MONTH and INTERVAL DAY functions in addition to numeric types.

       

      For documentation

      TBA

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              • Assignee:
                KazydubB Bohdan Kazydub
                Reporter:
                KazydubB Bohdan Kazydub
                Reviewer:
                Vitalii Diravka
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                • Created:
                  Updated:
                  Resolved: