I want to get the attribute from an Aggregation node, where is it? typedef struct Agg { Plan plan; AggStrategy aggstrategy; int numCols; /* number of grouping columns */ AttrNumber *grpColIdx; /* their indexes in the target list */ Oid *grpOperators; /* equality operators to compare with */ long numGroups; /* estimated number of groups in input */ } Agg;
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