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The following page has been changed by OlgaN:
http://wiki.apache.org/pig/PigStreamingFunctionalSpec

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  Given the definition above, the stream command will look as follows:
  
  {{{
- <stream command>::= <alias> = stream <alias>{,<alias>} through <streaming 
spec> [<schema spec>]
+ <stream command>::= <alias> = stream <alias> through <streaming spec> 
[<schema spec>]
  <streaming spec>::= <alias> | <UDF spec> | <command>
  <schema spec>:: standard pig schema spec like as (x,yz)
  }}}

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