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  1. Apache Drill
  2. DRILL-3596

Allow only (<expression>) or (<expression>, 1) for LEAD and LAG window functions as input parameters

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      We need to disable the third input parameter in LEAD and LAG window functions. We should support this syntax.

      LEAD(<expression>) ,or LEAD(<expression>,1)
      LAG(<expression>), or LAG(<expression>,1)

      In both the functions above, the second parameter is the default offset value, use of any other value must he handled and reported to user as error.

      Use of a third input parameter to both the functions must be disallowed.

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            adeneche Abdel Hakim Deneche
            khfaraaz Khurram Faraaz
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