diff --git a/src/backend/gporca/libgpopt/src/engine/CStatisticsConfig.cpp b/src/backend/gporca/libgpopt/src/engine/CStatisticsConfig.cpp
index 885a809d5f0..f26fd3025bd 100644
--- a/src/backend/gporca/libgpopt/src/engine/CStatisticsConfig.cpp
+++ b/src/backend/gporca/libgpopt/src/engine/CStatisticsConfig.cpp
@@ -41,9 +41,9 @@ CStatisticsConfig::CStatisticsConfig(CMemoryPool *mp,
 	  m_max_stats_buckets(max_stats_buckets),
 	  m_phsmdidcolinfo(nullptr)
 {
-	GPOS_ASSERT(CDouble(0.0) < damping_factor_filter);
+	GPOS_ASSERT(CDouble(0.0) <= damping_factor_filter);
 	GPOS_ASSERT(CDouble(0.0) <= damping_factor_join);
-	GPOS_ASSERT(CDouble(0.0) < damping_factor_groupby);
+	GPOS_ASSERT(CDouble(0.0) <= damping_factor_groupby);
 	GPOS_ASSERT(0 < max_stats_buckets);
 
 	//m_phmmdidcolinfo = New(m_mp) HMMDIdMissingstatscol(m_mp);
diff --git a/src/backend/gporca/libnaucrates/src/statistics/CScaleFactorUtils.cpp b/src/backend/gporca/libnaucrates/src/statistics/CScaleFactorUtils.cpp
index d6e078bd7e9..658eb68caf4 100644
--- a/src/backend/gporca/libnaucrates/src/statistics/CScaleFactorUtils.cpp
+++ b/src/backend/gporca/libnaucrates/src/statistics/CScaleFactorUtils.cpp
@@ -502,12 +502,25 @@ CScaleFactorUtils::CalcScaleFactorCumulativeConj(
 
 	const ULONG num_cols = scale_factors->Size();
 	CDouble scale_factor(1.0);
+	if (0 == num_cols)
+	{
+		return scale_factor;
+	}
+
 	if (1 < num_cols)
 	{
 		// sort (in desc order) the scaling factor based on the selectivity of each column
 		scale_factors->Sort(CScaleFactorUtils::DescendingOrderCmpFunc);
 	}
 
+	if (CDouble(0.0) == stats_config->DDampingFactorFilter())
+	{
+		// Maximum overlap: retain only the smallest selectivity, represented
+		// by the largest scale factor. Handle zero explicitly rather than
+		// relying on CDouble's minimum magnitude when computing powers.
+		return std::max(CStatistics::MinRows.Get(), (*scale_factors)[0]->Get());
+	}
+
 	for (ULONG ul = 0; ul < num_cols; ul++)
 	{
 		// apply damping factor