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  1. IMPALA
  2. IMPALA-3273

LEAD and LAG do not support a column for the default value

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    Details

    • Type: New Feature
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: Impala 2.2
    • Fix Version/s: None
    • Component/s: Backend

      Description

      The default values for the LEAD and LAG functions fails when using a column.

      ex: SELECT LEAD( column_name, 1, column_name ) FROM some_table

      This will only work if the default value is a constant.

      Here is some of the the grammar from SQL:2016:

      <lead or lag function> ::=
        <lead or lag> <left paren> <lead or lag extent>
            [ <comma> <offset> [ <comma> <default expression> ] ] <right paren>
            [ <null treatment> ]
      
      <default expression> ::=
        <value expression>
      
      <value expression> ::=
          <common value expression>
        | <boolean value expression>
        | <row value expression>
      
      

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            • Assignee:
              Unassigned
              Reporter:
              dmagaha_impala_004b David Magaha
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              Dates

              • Created:
                Updated: