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  1. Hive
  2. HIVE-21896

SHOW FUNCTIONS / SHOW FUNCTIONS LIKE - clarify

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      Description

      According to https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-ShowFunctions the currently available functions can be listed like this:

      SHOW FUNCTIONS <pattern>;

      If the user executes this command, they will get the correct list of functions, but they will also see this on the standard output:

      SHOW FUNCTIONS is deprecated, please use SHOW FUNCTIONS LIKE instead.

      If the user uses the

      SHOW FUNCTIONS LIKE <pattern>;

      command then they will receive the exact same result (though through different codes). The only difference is that one can get all the function names with "SHOW FUNCTIONS;", while "SHOW FUNCTIONS LIKE;" returns an exception, so in this case the pattern is mandatory.

      So there should be a decision if we still accept "SHOW FUNCTIONS" without the "LIKE". My suggestion is to accept it only if there is no pattern. so "SHOW FUNCTIONS;" is ok, without deprecation message, but "SHOW FUNCTIONS <pattern>" should throw an exception.

      Whatever we decide, we should document it appropriately.

      cc Kris Hahn

        Attachments

        1. HIVE-21896.02.patch
          25 kB
          Miklos Gergely
        2. HIVE-21896.01.patch
          19 kB
          Miklos Gergely

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            • Assignee:
              mgergely Miklos Gergely
              Reporter:
              mgergely Miklos Gergely
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