[GitHub] incubator-hivemall issue #97: [HIVEMALL-130] Support user-defined dictionary...

[takuti]

Github user takuti commented on the issue:

    https://github.com/apache/incubator-hivemall/pull/97
  
    ^ In 474027264121c66a673cd6da483111b22f65b2fd, `tokenize_ja()` supports 
"NULL" stop words/tags in order to allow users to explicitly choose default 
set. That is, `null` and `array()` are dealt differently. This modification 
improves usability of the fifth argument.
    
    ```sql
    hive> select
        >   tokenize_ja("今日は特にいい天気ですね。", "normal") as 
default1,
        >   tokenize_ja("今日は特にいい天気ですね。", "normal", 
null) as default2, -- use default stop words
        >   tokenize_ja("今日は特にいい天気ですね。", "normal", 
array()) as no_stopwords, -- "empty" (i.e., no) stop words
        >   tokenize_ja("今日は特にいい天気ですね。", "normal", 
null, null) as default3, -- use default stop word and tags
        >   tokenize_ja("今日は特にいい天気ですね。", "normal", 
null, array()) as no_stoptags, -- "empty" stop tags
        >   tokenize_ja("今日は特にいい天気ですね。", "normal", 
array(), array()) as no_stopwords_stoptags -- "empty" stop words and tags
        > ;
    OK
    default1        default2        no_stopwords    default3        no_stoptags 
    no_stopwords_stoptags
    ["今日","いい","天気"]  ["今日","いい","天気"]  
["今日","特に","いい","天気"]   ["今日","いい","天気"]  
["今日","いい","天気","ね"]     
["今日","は","特に","いい","天気","です","ね"]
    ```


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