Commits on Nov 20, 2024

1. - Add 'group()' built-in function to DaphneDSL. …

    - This built-in function creates a GroupOp in DaphneIR.
    - Only support 'SUM' as an aggregation function.
    - Get only one aggregation column.
    - Get an arbitrary number of columns to group on.
   - Add support for string values in the 'group' kernel function.
     - SUM, MIN, and MAX are the only aggregation functions applied to string columns.
     - Other aggregation functions throw an exception if they receive strings as arguments or results.
     - Additionally, 'DeduceValueTypeAndExecute' cannot handle string values due to unsupported operations on strings.
     - Therefore, 'ColumnGroupAggStringVTArg' that is specialized for strings is used.
     - Or 'ColumnGroupAgg' is called exclusively with string values.
   - The 'group' function internally calls the 'order' and 'extractCol' kernel functions.
     - These two functions are updated to handle string values correctly.
   - Added script-level test cases to validate the new functionality.
   - Close issue daphne-eu#903

   

   saminbassiri committed Nov 20, 2024
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2. fix bug in group built-in function

   

   saminbassiri committed Nov 20, 2024
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