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    TFPExprNode.InitAggregate

    Initialize aggregate processing for the node

    Declaration

    Source position: fpexprpars.pp line 121

    public 
procedure TFPExprNode.InitAggregate;  virtual;

    Description

    The InitAggregate virtual method initializes aggregate processing state for nodes that participate in aggregate operations. It is called at the beginning of an aggregate processing cycle to reset counters, accumulators, and other aggregate state.

    For most expression nodes, this method does nothing (default implementation). However, nodes representing aggregate functions (like SUM, COUNT, AVG) override this method to initialize their aggregation state.