diff --git a/dbcon/execplan/aggregatecolumn.cpp b/dbcon/execplan/aggregatecolumn.cpp
index b6262f998..da50c983d 100644
--- a/dbcon/execplan/aggregatecolumn.cpp
+++ b/dbcon/execplan/aggregatecolumn.cpp
@@ -260,8 +260,6 @@ bool AggregateColumn::operator==(const AggregateColumn& t) const
 	}
 	else if (fFunctionParms.get() != NULL || t.fFunctionParms.get() != NULL)
 		return false;
-	//if (fAlias != t.fAlias)
-	//	return false;
 	if (fTableAlias != t.fTableAlias)
 		return false;
 	if (fData != t.fData)
diff --git a/dbcon/execplan/arithmeticcolumn.cpp b/dbcon/execplan/arithmeticcolumn.cpp
index 2c2eb5ace..4306f3191 100644
--- a/dbcon/execplan/arithmeticcolumn.cpp
+++ b/dbcon/execplan/arithmeticcolumn.cpp
@@ -345,10 +345,6 @@ bool ArithmeticColumn::operator==(const ArithmeticColumn& t) const
 	}
 	else if (fExpression != NULL || t.fExpression != NULL)
 		return false;
-//	if (fAlias != t.fAlias)
-//		return false;
-//	if (fTableAlias != t.fTableAlias)
-//	    return false;
 	if (fData != t.fData)
 		return false;
 	return true;
diff --git a/dbcon/execplan/constantcolumn.cpp b/dbcon/execplan/constantcolumn.cpp
index fadd2dfc9..04caafc9c 100644
--- a/dbcon/execplan/constantcolumn.cpp
+++ b/dbcon/execplan/constantcolumn.cpp
@@ -316,8 +316,6 @@ bool ConstantColumn::operator==(const ConstantColumn& t) const
 		return false;
 	if (fType != t.fType)
 		return false;
-//	if (fAlias != t.fAlias)
-//		return false;
 	if (fData != t.fData)
 		return false;
 	if (fReturnAll != t.fReturnAll)
diff --git a/dbcon/execplan/functioncolumn.cpp b/dbcon/execplan/functioncolumn.cpp
index 2316557ac..f7467f40f 100644
--- a/dbcon/execplan/functioncolumn.cpp
+++ b/dbcon/execplan/functioncolumn.cpp
@@ -309,8 +309,6 @@ bool FunctionColumn::operator==(const FunctionColumn& t) const
 		 ++it, ++it2)
 		if (**it != **it2)
 			return false;
-//	if (fAlias != t.fAlias)
-//		return false;
 	if (fTableAlias != t.fTableAlias)
 		return false;
 	if (fData != t.fData)
diff --git a/dbcon/execplan/returnedcolumn.cpp b/dbcon/execplan/returnedcolumn.cpp
index f3b7f9a10..d78817f06 100644
--- a/dbcon/execplan/returnedcolumn.cpp
+++ b/dbcon/execplan/returnedcolumn.cpp
@@ -173,12 +173,11 @@ void ReturnedColumn::unserialize(messageqcpp::ByteStream& b)
 
 bool ReturnedColumn::operator==(const ReturnedColumn& t) const
 {
+    // Not all fields are considered for a positive equality.
 	if (fData != t.fData)
 		return false;
 	if (fCardinality != t.fCardinality)
 		return false;
-	//if (fAlias != t.fAlias)
-	//	return false;
 	if (fDistinct != t.fDistinct)
 		return false;
 	if (fJoinInfo != t.fJoinInfo)
@@ -187,20 +186,14 @@ bool ReturnedColumn::operator==(const ReturnedColumn& t) const
 		return false;
 	if (fNullsFirst != t.fNullsFirst)
 		return false;
-	//if (fOrderPos != t.fOrderPos)
-	//	return false;
 	if (fInputIndex != t.fInputIndex)
 		return false;
 	if (fOutputIndex != t.fOutputIndex)
 		return false;
-	//if (fSequence != t.fSequence)
-	//	return false;
 	if (fResultType != t.fResultType)
 		return false;
 	if (fOperationType != t.fOperationType)
 		return false;
-	//if (fExpressionId != t.fExpressionId)
-	//	return false;
 	return true;
 }
 
diff --git a/dbcon/execplan/simplecolumn.cpp b/dbcon/execplan/simplecolumn.cpp
index 895334fc9..34eb4c919 100644
--- a/dbcon/execplan/simplecolumn.cpp
+++ b/dbcon/execplan/simplecolumn.cpp
@@ -333,7 +333,6 @@ void SimpleColumn::serialize(messageqcpp::ByteStream& b) const
 	b << fViewName;
 	b << (uint32_t) fOid;
 	b << fData;
-	//b << fAlias;
 	b << fTableAlias;
 	b << (uint32_t) fSequence;
 	b << static_cast<const ByteStream::doublebyte>(fIsInfiniDB);
@@ -350,7 +349,6 @@ void SimpleColumn::unserialize(messageqcpp::ByteStream& b)
 	b >> fViewName;
 	b >> (uint32_t&) fOid;
 	b >> fData;
-	//b >> fAlias;
 	b >> fTableAlias;
 	b >> (uint32_t&) fSequence;
 	b >> reinterpret_cast< ByteStream::doublebyte&>(fIsInfiniDB);
@@ -370,16 +368,12 @@ bool SimpleColumn::operator==(const SimpleColumn& t) const
 		return false;
 	if (fColumnName != t.fColumnName)
 		return false;
-//	if (fIndexName != t.fIndexName)
-//		return false;
 	if (fViewName != t.fViewName)
 		return false;
 	if (fOid != t.fOid)
 		return false;
 	if (data() != t.data())
 		return false;
-//	if (fAlias != t.fAlias)
-//		return false;
 	if (fTableAlias != t.fTableAlias)
 		return false;
 	if (fAsc != t.fAsc)