Function getNestedColumn

src/Statistics/SampleCollectStep.cpp:402–415

}

static ColumnPtr getNestedColumn(ColumnPtr column)
{
    if (column->lowCardinality())
    {
        column = column->convertToFullColumnIfLowCardinality();
    }

    if (column->isNullable())
    {
        return checkAndGetColumn<ColumnNullable>(*column)->getNestedColumnPtr();
    }

    return column;
}

class StatisticsCollectorStepSample : public CollectStep
{