presto-main/src/main/java/io/prestosql/cost/SymbolStatsEstimate.java/SymbolStatsEstimate/equals
class SymbolStatsEstimate:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        SymbolStatsEstimate that = (SymbolStatsEstimate) o;
        return Double.compare(nullsFraction, that.nullsFraction) == 0 &&
                Double.compare(averageRowSize, that.averageRowSize) == 0 &&
                Double.compare(distinctValuesCount, that.distinctValuesCount) == 0 &&
                Double.compare(lowValue, that.lowValue) == 0 &&
                Double.compare(highValue, that.highValue) == 0;
    }