diff --git a/internal/jet/cast.go b/internal/jet/cast.go
deleted file mode 100644
index 311ab88..0000000
--- a/internal/jet/cast.go
+++ /dev/null
@@ -1,53 +0,0 @@
-package jet
-
-// Cast interface
-type Cast interface {
-	AS(castType string) Expression
-}
-
-type castImpl struct {
-	expression Expression
-}
-
-// NewCastImpl creates new generic cast
-func NewCastImpl(expression Expression) Cast {
-	castImpl := castImpl{
-		expression: expression,
-	}
-
-	return &castImpl
-}
-
-func (b *castImpl) AS(castType string) Expression {
-	castExp := &castExpression{
-		expression: b.expression,
-		cast:       string(castType),
-	}
-
-	castExp.ExpressionInterfaceImpl.Root = castExp
-
-	return castExp
-}
-
-type castExpression struct {
-	ExpressionInterfaceImpl
-
-	expression Expression
-	cast       string
-}
-
-func (b *castExpression) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
-
-	expression := b.expression
-	castType := b.cast
-
-	if castOverride := out.Dialect.OperatorSerializeOverride("CAST"); castOverride != nil {
-		castOverride(expression, String(castType))(statement, out, FallTrough(options)...)
-		return
-	}
-
-	out.WriteString("CAST(")
-	expression.serialize(statement, out, FallTrough(options)...)
-	out.WriteString("AS")
-	out.WriteString(castType + ")")
-}
diff --git a/internal/jet/cast_test.go b/internal/jet/cast_test.go
deleted file mode 100644
index b72cede..0000000
--- a/internal/jet/cast_test.go
+++ /dev/null
@@ -1,11 +0,0 @@
-package jet
-
-import (
-	"testing"
-)
-
-func TestCastAS(t *testing.T) {
-	assertClauseSerialize(t, NewCastImpl(Int(1)).AS("boolean"), "CAST($1 AS boolean)", int64(1))
-	assertClauseSerialize(t, NewCastImpl(table2Col3).AS("real"), "CAST(table2.col3 AS real)")
-	assertClauseSerialize(t, NewCastImpl(table2Col3.ADD(table2Col3)).AS("integer"), "CAST((table2.col3 + table2.col3) AS integer)")
-}
diff --git a/internal/jet/dialect.go b/internal/jet/dialect.go
index 678e044..83b6fe4 100644
--- a/internal/jet/dialect.go
+++ b/internal/jet/dialect.go
@@ -18,6 +18,7 @@ type Dialect interface {
 	SerializeOrderBy() func(expression Expression, ascending, nullsFirst *bool) SerializerFunc
 	ValuesDefaultColumnName(index int) string
 	JsonValueEncode(expr Expression) Expression
+	RegexpLike(str StringExpression, not bool, pattern StringExpression, caseSensitive bool) SerializerFunc
 }
 
 // SerializerFunc func
@@ -43,6 +44,7 @@ type DialectParams struct {
 	SerializeOrderBy           func(expression Expression, ascending, nullsFirst *bool) SerializerFunc
 	ValuesDefaultColumnName    func(index int) string
 	JsonValueEncode            func(expr Expression) Expression
+	RegexpLike                 func(str StringExpression, not bool, pattern StringExpression, caseSensitive bool) SerializerFunc
 }
 
 // NewDialect creates new dialect with params
@@ -60,6 +62,7 @@ func NewDialect(params DialectParams) Dialect {
 		serializeOrderBy:           params.SerializeOrderBy,
 		valuesDefaultColumnName:    params.ValuesDefaultColumnName,
 		jsonValueEncode:            params.JsonValueEncode,
+		regexpLike:                 params.RegexpLike,
 	}
 }
 
@@ -76,6 +79,7 @@ type dialectImpl struct {
 	serializeOrderBy           func(expression Expression, ascending, nullsFirst *bool) SerializerFunc
 	valuesDefaultColumnName    func(index int) string
 	jsonValueEncode            func(expr Expression) Expression
+	regexpLike                 func(str StringExpression, not bool, pattern StringExpression, caseSensitive bool) SerializerFunc
 }
 
 func (d *dialectImpl) Name() string {
@@ -133,6 +137,21 @@ func (d *dialectImpl) JsonValueEncode(expr Expression) Expression {
 	return d.jsonValueEncode(expr)
 }
 
+func (d *dialectImpl) RegexpLike(str StringExpression, not bool, pattern StringExpression, caseSensitive bool) SerializerFunc {
+	if d.regexpLike != nil {
+		return d.regexpLike(str, not, pattern, caseSensitive)
+	}
+
+	return func(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
+		str.serialize(statement, out, FallTrough(options)...)
+		if not {
+			out.WriteString("NOT")
+		}
+		out.WriteString("REGEXP")
+		pattern.serialize(statement, out, FallTrough(options)...)
+	}
+}
+
 func arrayOfStringsToMapOfStrings(arr []string) map[string]bool {
 	ret := map[string]bool{}
 	for _, elem := range arr {
diff --git a/internal/jet/expression.go b/internal/jet/expression.go
index e915852..2694b7a 100644
--- a/internal/jet/expression.go
+++ b/internal/jet/expression.go
@@ -141,24 +141,27 @@ type binaryOperatorSerializer struct {
 }
 
 func (c *binaryOperatorSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
-	if serializeOverride := out.Dialect.OperatorSerializeOverride(c.operator); serializeOverride != nil {
-		serializeOverrideFunc := serializeOverride(c.lhs, c.rhs, c.additionalParam)
-		serializeOverrideFunc(statement, out, FallTrough(options)...)
-	} else {
-		c.lhs.serialize(statement, out, FallTrough(options)...)
-		out.WriteString(c.operator)
-		c.rhs.serialize(statement, out, FallTrough(options)...)
-	}
+	optionalWrap(out, options, func(out *SQLBuilder, options []SerializeOption) {
+		if serializeOverride := out.Dialect.OperatorSerializeOverride(c.operator); serializeOverride != nil {
+			serializeOverrideFunc := serializeOverride(c.lhs, c.rhs, c.additionalParam)
+			serializeOverrideFunc(statement, out, FallTrough(options)...)
+		} else {
+			c.lhs.serialize(statement, out, FallTrough(options)...)
+			out.WriteString(c.operator)
+			c.rhs.serialize(statement, out, FallTrough(options)...)
+		}
+	})
+
 }
 
 // NewBinaryOperatorExpression creates new binaryOperatorExpression
 func NewBinaryOperatorExpression(lhs, rhs Serializer, operator string, additionalParam ...Expression) Expression {
-	return newExpression(optionalWrap(&binaryOperatorSerializer{
+	return newExpression(&binaryOperatorSerializer{
 		lhs:             lhs,
 		rhs:             rhs,
 		additionalParam: OptionalOrDefault(additionalParam, nil),
 		operator:        operator,
-	}))
+	})
 }
 
 type serializersWithOperator struct {
@@ -226,24 +229,24 @@ type betweenOperatorSerializer struct {
 }
 
 func (b *betweenOperatorSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
-	b.expression.serialize(statement, out, FallTrough(options)...)
-	if b.notBetween {
-		out.WriteString("NOT")
-	}
-	out.WriteString("BETWEEN")
-	b.min.serialize(statement, out, FallTrough(options)...)
-	out.WriteString("AND")
-	b.max.serialize(statement, out, FallTrough(options)...)
+	optionalWrap(out, options, func(out *SQLBuilder, options []SerializeOption) {
+		b.expression.serialize(statement, out, FallTrough(options)...)
+		if b.notBetween {
+			out.WriteString("NOT")
+		}
+		out.WriteString("BETWEEN")
+		b.min.serialize(statement, out, FallTrough(options)...)
+		out.WriteString("AND")
+		b.max.serialize(statement, out, FallTrough(options)...)
+	})
 }
 
 // NewBetweenOperatorExpression creates new BETWEEN operator expression
 func NewBetweenOperatorExpression(expression, min, max Expression, notBetween bool) BoolExpression {
-	return BoolExp(newExpression(
-		optionalWrap(&betweenOperatorSerializer{
-			expression: expression,
-			notBetween: notBetween,
-			min:        min,
-			max:        max,
-		}),
-	))
+	return BoolExp(newExpression(&betweenOperatorSerializer{
+		expression: expression,
+		notBetween: notBetween,
+		min:        min,
+		max:        max,
+	}))
 }
diff --git a/internal/jet/func_expression.go b/internal/jet/func_expression.go
index af256f3..38363b5 100644
--- a/internal/jet/func_expression.go
+++ b/internal/jet/func_expression.go
@@ -244,7 +244,7 @@ func leadLagImpl(name string, expr Expression, offsetAndDefault ...interface{})
 		defaultValue, ok = offsetAndDefault[1].(Expression)
 
 		if !ok {
-			defaultValue = literal(offsetAndDefault[1])
+			defaultValue = Literal(offsetAndDefault[1])
 		}
 
 		params = append(params, FixedLiteral(offset), defaultValue)
diff --git a/internal/jet/integer_expression_test.go b/internal/jet/integer_expression_test.go
index a20981b..e1c850c 100644
--- a/internal/jet/integer_expression_test.go
+++ b/internal/jet/integer_expression_test.go
@@ -66,7 +66,7 @@ func TestIntExpressionPOW(t *testing.T) {
 
 func TestIntExpressionBIT_NOT(t *testing.T) {
 	assertClauseSerialize(t, BIT_NOT(table2ColInt), "(~ table2.col_int)")
-	assertClauseSerialize(t, BIT_NOT(Int(11)), "(~ 11)")
+	assertClauseSerialize(t, BIT_NOT(Int(11)), "(~ $1)", int64(11))
 }
 
 func TestIntExpressionBIT_AND(t *testing.T) {
diff --git a/internal/jet/literal_expression.go b/internal/jet/literal_expression.go
index b8baa51..f7ceedf 100644
--- a/internal/jet/literal_expression.go
+++ b/internal/jet/literal_expression.go
@@ -5,48 +5,12 @@ import (
 	"time"
 )
 
-// LiteralExpression is representation of an escaped literal
-type LiteralExpression interface {
-	Expression
-
-	Value() interface{}
-	SetConstant(constant bool)
-}
-
-type literalExpressionImpl struct {
-	ExpressionInterfaceImpl
-
+type literalSerializer struct {
 	value    interface{}
 	constant bool
 }
 
-func literal(value interface{}, optionalConstant ...bool) *literalExpressionImpl {
-	exp := literalExpressionImpl{value: value}
-
-	if len(optionalConstant) > 0 {
-		exp.constant = optionalConstant[0]
-	}
-
-	exp.ExpressionInterfaceImpl.Root = &exp
-
-	return &exp
-}
-
-// Literal is injected directly to SQL query, and does not appear in parametrized argument list.
-func Literal(value interface{}) *literalExpressionImpl {
-	exp := literal(value)
-	return exp
-}
-
-// FixedLiteral is injected directly to SQL query, and does not appear in parametrized argument list.
-func FixedLiteral(value interface{}) *literalExpressionImpl {
-	exp := literal(value)
-	exp.constant = true
-
-	return exp
-}
-
-func (l *literalExpressionImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
+func (l *literalSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
 	if l.constant {
 		out.insertConstantArgument(l.value)
 	} else {
@@ -54,260 +18,145 @@ func (l *literalExpressionImpl) serialize(statement StatementType, out *SQLBuild
 	}
 }
 
-func (l *literalExpressionImpl) Value() interface{} {
-	return l.value
+// Literal is injected directly to SQL query, and does not appear in parametrized argument list.
+func Literal(value interface{}) Expression {
+	return newExpression(&literalSerializer{
+		value:    value,
+		constant: false,
+	})
 }
 
-func (l *literalExpressionImpl) SetConstant(constant bool) {
-	l.constant = constant
-}
-
-type integerLiteralExpression struct {
-	literalExpressionImpl
-	integerInterfaceImpl
-}
-
-func intLiteral(value interface{}) IntegerExpression {
-	numLiteral := &integerLiteralExpression{}
-
-	numLiteral.literalExpressionImpl = *literal(value)
-
-	numLiteral.literalExpressionImpl.Root = numLiteral
-	numLiteral.integerInterfaceImpl.root = numLiteral
-
-	return numLiteral
+// FixedLiteral is injected directly to SQL query, and does not appear in parametrized argument list.
+func FixedLiteral(value interface{}) Expression {
+	return newExpression(&literalSerializer{
+		value:    value,
+		constant: true,
+	})
 }
 
 // Int creates a new 64 bit signed integer literal
 func Int(value int64) IntegerExpression {
-	return intLiteral(value)
+	return IntExp(Literal(value))
 }
 
 // Int8 creates a new 8 bit signed integer literal
 func Int8(value int8) IntegerExpression {
-	return intLiteral(value)
+	return IntExp(Literal(value))
 }
 
 // Int16 creates a new 16 bit signed integer literal
 func Int16(value int16) IntegerExpression {
-	return intLiteral(value)
+	return IntExp(Literal(value))
 }
 
 // Int32 creates a new 32 bit signed integer literal
 func Int32(value int32) IntegerExpression {
-	return intLiteral(value)
+	return IntExp(Literal(value))
 }
 
 // Uint8 creates a new 8 bit unsigned integer literal
 func Uint8(value uint8) IntegerExpression {
-	return intLiteral(value)
+	return IntExp(Literal(value))
 }
 
 // Uint16 creates a new 16 bit unsigned integer literal
 func Uint16(value uint16) IntegerExpression {
-	return intLiteral(value)
+	return IntExp(Literal(value))
 }
 
 // Uint32 creates a new 32 bit unsigned integer literal
 func Uint32(value uint32) IntegerExpression {
-	return intLiteral(value)
+	return IntExp(Literal(value))
 }
 
 // Uint64 creates a new 64 bit unsigned integer literal
 func Uint64(value uint64) IntegerExpression {
-	return intLiteral(value)
-}
-
-// ---------------------------------------------------//
-type boolLiteralExpression struct {
-	boolInterfaceImpl
-	literalExpressionImpl
+	return IntExp(Literal(value))
 }
 
 // Bool creates new bool literal expression
 func Bool(value bool) BoolExpression {
-	boolLiteralExpression := boolLiteralExpression{}
-
-	boolLiteralExpression.literalExpressionImpl = *literal(value)
-	boolLiteralExpression.boolInterfaceImpl.root = &boolLiteralExpression
-
-	return &boolLiteralExpression
-}
-
-// ---------------------------------------------------//
-type floatLiteral struct {
-	floatInterfaceImpl
-	literalExpressionImpl
+	return BoolExp(Literal(value))
 }
 
 // Float creates new float literal from float64 value
 func Float(value float64) FloatExpression {
-	floatLiteral := floatLiteral{}
-	floatLiteral.literalExpressionImpl = *literal(value)
-
-	floatLiteral.floatInterfaceImpl.root = &floatLiteral
-
-	return &floatLiteral
+	return FloatExp(Literal(value))
 }
 
 // Decimal creates new float literal from string value
 func Decimal(value string) FloatExpression {
-	floatLiteral := floatLiteral{}
-	floatLiteral.literalExpressionImpl = *literal(value)
-
-	floatLiteral.floatInterfaceImpl.root = &floatLiteral
-
-	return &floatLiteral
-}
-
-// ---------------------------------------------------//
-type stringLiteral struct {
-	stringInterfaceImpl
-	literalExpressionImpl
+	return FloatExp(Literal(value))
 }
 
 // String creates new string literal expression
 func String(value string) StringExpression {
-	stringLiteral := stringLiteral{}
-	stringLiteral.literalExpressionImpl = *literal(value)
-
-	stringLiteral.stringInterfaceImpl.root = &stringLiteral
-
-	return &stringLiteral
-}
-
-//---------------------------------------------------//
-
-type timeLiteral struct {
-	timeInterfaceImpl
-	literalExpressionImpl
+	return StringExp(Literal(value))
 }
 
 // Time creates new time literal expression
 func Time(hour, minute, second int, nanoseconds ...time.Duration) TimeExpression {
-	timeLiteral := &timeLiteral{}
 	timeStr := fmt.Sprintf("%02d:%02d:%02d", hour, minute, second)
 	timeStr += formatNanoseconds(nanoseconds...)
-	timeLiteral.literalExpressionImpl = *literal(timeStr)
 
-	timeLiteral.timeInterfaceImpl.root = timeLiteral
-
-	return timeLiteral
+	return TimeExp(Literal(timeStr))
 }
 
 // TimeT creates new time literal expression from time.Time object
 func TimeT(t time.Time) TimeExpression {
-	timeLiteral := &timeLiteral{}
-	timeLiteral.literalExpressionImpl = *literal(t)
-	timeLiteral.timeInterfaceImpl.root = timeLiteral
-
-	return timeLiteral
-}
-
-//---------------------------------------------------//
-
-type timezLiteral struct {
-	timezInterfaceImpl
-	literalExpressionImpl
+	return TimeExp(Literal(t))
 }
 
 // Timez creates new time with time zone literal expression
 func Timez(hour, minute, second int, nanoseconds time.Duration, timezone string) TimezExpression {
-	timezLiteral := timezLiteral{}
 	timeStr := fmt.Sprintf("%02d:%02d:%02d", hour, minute, second)
 	timeStr += formatNanoseconds(nanoseconds)
 	timeStr += " " + timezone
-	timezLiteral.literalExpressionImpl = *literal(timeStr)
 
-	return TimezExp(literal(timeStr))
+	return TimezExp(Literal(timeStr))
 }
 
 // TimezT creates new time with time zone literal expression from time.Time object
 func TimezT(t time.Time) TimezExpression {
-	timeLiteral := &timezLiteral{}
-	timeLiteral.literalExpressionImpl = *literal(t)
-	timeLiteral.timezInterfaceImpl.root = timeLiteral
-
-	return timeLiteral
-}
-
-//---------------------------------------------------//
-
-type timestampLiteral struct {
-	timestampInterfaceImpl
-	literalExpressionImpl
+	return TimezExp(Literal(t))
 }
 
 // Timestamp creates new timestamp literal expression
 func Timestamp(year int, month time.Month, day, hour, minute, second int, nanoseconds ...time.Duration) TimestampExpression {
-	timestamp := &timestampLiteral{}
 	timeStr := fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d", year, month, day, hour, minute, second)
 	timeStr += formatNanoseconds(nanoseconds...)
-	timestamp.literalExpressionImpl = *literal(timeStr)
-	timestamp.timestampInterfaceImpl.root = timestamp
-	return timestamp
+
+	return TimestampExp(Literal(timeStr))
 }
 
 // TimestampT creates new timestamp literal expression from time.Time object
 func TimestampT(t time.Time) TimestampExpression {
-	timestamp := &timestampLiteral{}
-	timestamp.literalExpressionImpl = *literal(t)
-	timestamp.timestampInterfaceImpl.root = timestamp
-	return timestamp
-}
-
-//---------------------------------------------------//
-
-type timestampzLiteral struct {
-	timestampzInterfaceImpl
-	literalExpressionImpl
+	return TimestampExp(Literal(t))
 }
 
 // Timestampz creates new timestamp with time zone literal expression
 func Timestampz(year int, month time.Month, day, hour, minute, second int, nanoseconds time.Duration, timezone string) TimestampzExpression {
-	timestamp := &timestampzLiteral{}
 	timeStr := fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d", year, month, day, hour, minute, second)
 	timeStr += formatNanoseconds(nanoseconds)
 	timeStr += " " + timezone
 
-	timestamp.literalExpressionImpl = *literal(timeStr)
-	timestamp.timestampzInterfaceImpl.root = timestamp
-	return timestamp
+	return TimestampzExp(Literal(timeStr))
 }
 
 // TimestampzT creates new timestamp literal expression from time.Time object
 func TimestampzT(t time.Time) TimestampzExpression {
-	timestamp := &timestampzLiteral{}
-	timestamp.literalExpressionImpl = *literal(t)
-	timestamp.timestampzInterfaceImpl.root = timestamp
-	return timestamp
-}
-
-//---------------------------------------------------//
-
-type dateLiteral struct {
-	dateInterfaceImpl
-	literalExpressionImpl
+	return TimestampzExp(Literal(t))
 }
 
 // Date creates new date literal expression
 func Date(year int, month time.Month, day int) DateExpression {
-	dateLiteral := &dateLiteral{}
-
 	timeStr := fmt.Sprintf("%04d-%02d-%02d", year, month, day)
-	dateLiteral.literalExpressionImpl = *literal(timeStr)
-	dateLiteral.dateInterfaceImpl.root = dateLiteral
-
-	return dateLiteral
+	return DateExp(Literal(timeStr))
 }
 
 // DateT creates new date literal expression from time.Time object
 func DateT(t time.Time) DateExpression {
-	dateLiteral := &dateLiteral{}
-	dateLiteral.literalExpressionImpl = *literal(t)
-	dateLiteral.dateInterfaceImpl.root = dateLiteral
-
-	return dateLiteral
+	return DateExp(Literal(t))
 }
 
 func formatNanoseconds(nanoseconds ...time.Duration) string {
@@ -330,86 +179,35 @@ func formatNanoseconds(nanoseconds ...time.Duration) string {
 
 var (
 	// NULL is jet equivalent of SQL NULL
-	NULL = newNullLiteral()
+	NULL = newExpression(Keyword("NULL"))
 	// STAR is jet equivalent of SQL *
-	STAR = newStarLiteral()
+	STAR = newExpression(Keyword("*"))
 	// PLUS_INFINITY is jet equivalent for sql infinity
 	PLUS_INFINITY = String("infinity")
 	// MINUS_INFINITY is jet equivalent for sql -infinity
 	MINUS_INFINITY = String("-infinity")
 )
 
-type nullLiteral struct {
-	ExpressionInterfaceImpl
-}
-
-func newNullLiteral() Expression {
-	nullExpression := &nullLiteral{}
-
-	nullExpression.ExpressionInterfaceImpl.Root = nullExpression
-
-	return nullExpression
-}
-
-func (n *nullLiteral) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
-	out.WriteString("NULL")
-}
-
-// --------------------------------------------------//
-type starLiteral struct {
-	ExpressionInterfaceImpl
-}
-
-func newStarLiteral() Expression {
-	starExpression := &starLiteral{}
-
-	starExpression.ExpressionInterfaceImpl.Root = starExpression
-
-	return starExpression
-}
-
-func (n *starLiteral) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
-	out.WriteString("*")
-}
-
 //---------------------------------------------------//
 
-type rawExpression struct {
-	ExpressionInterfaceImpl
-
+type rawSerializer struct {
 	Raw           string
 	NamedArgument map[string]interface{}
-	noWrap        bool
 }
 
-func (n *rawExpression) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
-	if !n.noWrap && !contains(options, NoWrap) {
-		out.WriteByte('(')
-	}
-
-	out.insertRawQuery(n.Raw, n.NamedArgument)
-
-	if !n.noWrap && !contains(options, NoWrap) {
-		out.WriteByte(')')
-	}
+func (n *rawSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
+	optionalWrap(out, options, func(out *SQLBuilder, options []SerializeOption) {
+		out.insertRawQuery(n.Raw, n.NamedArgument)
+	})
 }
 
 // Raw can be used for any unsupported functions, operators or expressions.
 // For example: Raw("current_database()")
 func Raw(raw string, namedArgs ...map[string]interface{}) Expression {
-	var namedArguments map[string]interface{}
-
-	if len(namedArgs) > 0 {
-		namedArguments = namedArgs[0]
-	}
-
-	rawExp := &rawExpression{
+	return newExpression(&rawSerializer{
 		Raw:           raw,
-		NamedArgument: namedArguments,
-	}
-	rawExp.ExpressionInterfaceImpl.Root = rawExp
-
-	return rawExp
+		NamedArgument: singleOptional(namedArgs),
+	})
 }
 
 // RawBool helper that for raw string boolean expressions
diff --git a/internal/jet/operators.go b/internal/jet/operators.go
index b56cb1b..277fb2c 100644
--- a/internal/jet/operators.go
+++ b/internal/jet/operators.go
@@ -16,9 +16,6 @@ func NOT(exp BoolExpression) BoolExpression {
 
 // BIT_NOT inverts every bit in integer expression result
 func BIT_NOT(expr IntegerExpression) IntegerExpression {
-	if literalExp, ok := expr.(LiteralExpression); ok {
-		literalExp.SetConstant(true)
-	}
 	return newPrefixIntegerOperatorExpression(expr, "~")
 }
 
@@ -131,10 +128,8 @@ type caseOperatorImpl struct {
 
 // CASE create CASE operator with optional list of expressions
 func CASE(expression ...Expression) CaseOperator {
-	caseExp := &caseOperatorImpl{}
-
-	if len(expression) > 0 {
-		caseExp.expression = expression[0]
+	caseExp := &caseOperatorImpl{
+		expression: singleOptional(expression),
 	}
 
 	caseExp.ExpressionInterfaceImpl.Root = caseExp
diff --git a/internal/jet/order_set_aggregate_functions.go b/internal/jet/order_set_aggregate_functions.go
index 288f8a3..952afa0 100644
--- a/internal/jet/order_set_aggregate_functions.go
+++ b/internal/jet/order_set_aggregate_functions.go
@@ -34,25 +34,20 @@ func newOrderSetAggregateFunction(name string, fraction FloatExpression) *OrderS
 // WITHIN_GROUP_ORDER_BY specifies ordered set of aggregated argument values
 func (p *OrderSetAggregateFunc) WITHIN_GROUP_ORDER_BY(orderBy OrderByClause) Expression {
 	p.orderBy = ORDER_BY(orderBy)
-	return newOrderSetAggregateFuncExpression(*p)
+	return newOrderSetAggregateFuncExpression(p)
 }
 
-func newOrderSetAggregateFuncExpression(aggFunc OrderSetAggregateFunc) *orderSetAggregateFuncExpression {
-	ret := &orderSetAggregateFuncExpression{
+func newOrderSetAggregateFuncExpression(aggFunc *OrderSetAggregateFunc) Expression {
+	return newExpression(&orderSetAggregateFuncSerializer{
 		OrderSetAggregateFunc: aggFunc,
-	}
-
-	ret.ExpressionInterfaceImpl.Root = ret
-
-	return ret
+	})
 }
 
-type orderSetAggregateFuncExpression struct {
-	ExpressionInterfaceImpl
-	OrderSetAggregateFunc
+type orderSetAggregateFuncSerializer struct {
+	*OrderSetAggregateFunc
 }
 
-func (p *orderSetAggregateFuncExpression) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
+func (p *orderSetAggregateFuncSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
 	out.WriteString(p.name)
 
 	if p.fraction != nil {
diff --git a/internal/jet/raw_statement.go b/internal/jet/raw_statement.go
index ec551f0..7d73c6f 100644
--- a/internal/jet/raw_statement.go
+++ b/internal/jet/raw_statement.go
@@ -15,11 +15,8 @@ func RawStatement(dialect Dialect, rawQuery string, namedArgument ...map[string]
 			statementType: "",
 			root:          nil,
 		},
-		RawQuery: rawQuery,
-	}
-
-	if len(namedArgument) > 0 {
-		newRawStatement.NamedArguments = namedArgument[0]
+		RawQuery:       rawQuery,
+		NamedArguments: singleOptional(namedArgument),
 	}
 
 	newRawStatement.root = &newRawStatement
diff --git a/internal/jet/serializer.go b/internal/jet/serializer.go
index 7f49745..d6e09db 100644
--- a/internal/jet/serializer.go
+++ b/internal/jet/serializer.go
@@ -121,64 +121,50 @@ func (t Token) serialize(statement StatementType, out *SQLBuilder, options ...Se
 // CustomExpression creates new custom expression. When serialized may require parentheses
 // depending on context.
 func CustomExpression(parts ...Serializer) Expression {
-	return newExpression(optionalWrap(&customSerializer{
+	return newExpression(&customSerializer{
 		parts: parts,
-	}))
+	})
+}
+
+// AtomicCustomExpression creates new custom expression. When serialized does not require parentheses.
+func AtomicCustomExpression(parts ...Serializer) Expression {
+	return newExpression(&customSerializer{
+		parts:  parts,
+		atomic: true,
+	})
 }
 
 type customSerializer struct {
-	parts []Serializer
+	parts  []Serializer
+	atomic bool
 }
 
 func (c *customSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
-	for _, expression := range c.parts {
-		expression.serialize(statement, out, options...)
+	if c.atomic {
+		for _, expr := range c.parts {
+			expr.serialize(statement, out, without(options, NoWrap)...)
+		}
+	} else {
+		optionalWrap(out, options, func(out *SQLBuilder, options []SerializeOption) {
+			for _, expr := range c.parts {
+				expr.serialize(statement, out, options...)
+			}
+		})
 	}
 }
 
-type optionalWrapSerializer struct {
-	serializer []Serializer
-}
-
-func optionalWrap(serializer ...Serializer) Serializer {
-	return &optionalWrapSerializer{serializer: serializer}
-}
-
-func (s *optionalWrapSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
+func optionalWrap(out *SQLBuilder, options []SerializeOption, ser func(out *SQLBuilder, options []SerializeOption)) {
 	if !contains(options, NoWrap) {
 		out.WriteString("(")
 	}
 
-	for _, ser := range s.serializer {
-		ser.serialize(statement, out, without(options, NoWrap)...)
-	}
+	ser(out, without(options, NoWrap))
 
 	if !contains(options, NoWrap) {
 		out.WriteString(")")
 	}
 }
 
-// AtomicCustomExpression creates new custom expression. When serialized does not require parentheses.
-func AtomicCustomExpression(parts ...Serializer) Expression {
-	return newExpression(noWrap(&customSerializer{
-		parts: parts,
-	}))
-}
-
-type noWrapSerializer struct {
-	serializer []Serializer
-}
-
-func noWrap(serializer ...Serializer) Serializer {
-	return &noWrapSerializer{serializer: serializer}
-}
-
-func (s *noWrapSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
-	for _, ser := range s.serializer {
-		ser.serialize(statement, out, without(options, NoWrap)...)
-	}
-}
-
 func wrap(expressions ...Expression) Expression {
 	return newFunc("", expressions)
 }
diff --git a/internal/jet/string_expression.go b/internal/jet/string_expression.go
index 5d373ca..d032aad 100644
--- a/internal/jet/string_expression.go
+++ b/internal/jet/string_expression.go
@@ -85,11 +85,33 @@ func (s *stringInterfaceImpl) NOT_LIKE(pattern StringExpression) BoolExpression
 }
 
 func (s *stringInterfaceImpl) REGEXP_LIKE(pattern StringExpression, caseSensitive ...bool) BoolExpression {
-	return newBinaryBoolOperatorExpression(s.root, pattern, StringRegexpLikeOperator, Bool(len(caseSensitive) > 0 && caseSensitive[0]))
+	return BoolExp(newExpression(&regexpLikeSerializer{
+		str:           s.root,
+		pattern:       pattern,
+		caseSensitive: len(caseSensitive) > 0 && caseSensitive[0],
+	}))
 }
 
 func (s *stringInterfaceImpl) NOT_REGEXP_LIKE(pattern StringExpression, caseSensitive ...bool) BoolExpression {
-	return newBinaryBoolOperatorExpression(s.root, pattern, StringNotRegexpLikeOperator, Bool(len(caseSensitive) > 0 && caseSensitive[0]))
+	return BoolExp(newExpression(&regexpLikeSerializer{
+		not:           true,
+		str:           s.root,
+		pattern:       pattern,
+		caseSensitive: len(caseSensitive) > 0 && caseSensitive[0],
+	}))
+}
+
+type regexpLikeSerializer struct {
+	not           bool
+	str           StringExpression
+	pattern       StringExpression
+	caseSensitive bool
+}
+
+func (r *regexpLikeSerializer) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
+	optionalWrap(out, options, func(out *SQLBuilder, options []SerializeOption) {
+		out.Dialect.RegexpLike(r.str, r.not, r.pattern, r.caseSensitive)(statement, out, options...)
+	})
 }
 
 // ---------------------------------------------------//
diff --git a/internal/jet/utils.go b/internal/jet/utils.go
index aef2c8b..f502970 100644
--- a/internal/jet/utils.go
+++ b/internal/jet/utils.go
@@ -160,7 +160,7 @@ func ToSerializerValue(value interface{}) Serializer {
 		return clause
 	}
 
-	return literal(value)
+	return Literal(value)
 }
 
 // UnwindRowFromModel func
@@ -189,7 +189,7 @@ func UnwindRowFromModel(columns []Column, data interface{}) []Serializer {
 			field = reflect.Indirect(structField).Interface()
 		}
 
-		row[i] = literal(field)
+		row[i] = Literal(field)
 	}
 
 	return row
@@ -293,7 +293,7 @@ func joinAlias(tableAlias, columnAlias string) string {
 	return strings.TrimRight(tableAlias, ".*") + "." + columnAlias
 }
 
-func optional[T any](value []T) T {
+func singleOptional[T any](value []T) T {
 	if len(value) > 0 {
 		return value[0]
 	}
diff --git a/mysql/cast.go b/mysql/cast.go
index fbce06c..05dc61c 100644
--- a/mysql/cast.go
+++ b/mysql/cast.go
@@ -1,25 +1,25 @@
 package mysql
 
 import (
-	"github.com/go-jet/jet/v2/internal/jet"
 	"strconv"
+
+	"github.com/go-jet/jet/v2/internal/jet"
 )
 
-type cast struct {
-	jet.Cast
+// CAST function converts an expr (of any type) into later specified datatype.
+func CAST(expr Expression) *cast {
+	return &cast{
+		expr: expr,
+	}
 }
 
-// CAST function converts a expr (of any type) into latter specified datatype.
-func CAST(expr Expression) *cast {
-	ret := &cast{}
-	ret.Cast = jet.NewCastImpl(expr)
-
-	return ret
+type cast struct {
+	expr Expression
 }
 
 // AS casts expressions to castType
 func (c *cast) AS(castType string) Expression {
-	return c.Cast.AS(castType)
+	return jet.AtomicCustomExpression(Token("CAST("), c.expr, Token("AS "+castType+")"))
 }
 
 // AS_DATETIME cast expression to DATETIME type
diff --git a/mysql/dialect.go b/mysql/dialect.go
index 23947df..71a8e38 100644
--- a/mysql/dialect.go
+++ b/mysql/dialect.go
@@ -12,8 +12,6 @@ var Dialect = newDialect()
 
 func newDialect() jet.Dialect {
 	operatorSerializeOverrides := map[string]jet.SerializeOverride{}
-	operatorSerializeOverrides[jet.StringRegexpLikeOperator] = mysqlREGEXPLIKEoperator
-	operatorSerializeOverrides[jet.StringNotRegexpLikeOperator] = mysqlNOTREGEXPLIKEoperator
 	operatorSerializeOverrides["IS DISTINCT FROM"] = mysqlISDISTINCTFROM
 	operatorSerializeOverrides["IS NOT DISTINCT FROM"] = mysqlISNOTDISTINCTFROM
 	operatorSerializeOverrides["/"] = mysqlDivision
@@ -52,6 +50,7 @@ func newDialect() jet.Dialect {
 			}
 			return expr
 		},
+		RegexpLike: regexpLikeOperator,
 	}
 
 	return jet.NewDialect(mySQLDialectParams)
@@ -144,20 +143,12 @@ func mysqlISDISTINCTFROM(expressions ...jet.Serializer) jet.SerializerFunc {
 	}
 }
 
-func mysqlREGEXPLIKEoperator(expressions ...jet.Serializer) jet.SerializerFunc {
+func regexpLikeOperator(str StringExpression, not bool, pattern StringExpression, caseSensitive bool) jet.SerializerFunc {
 	return func(statement jet.StatementType, out *jet.SQLBuilder, options ...jet.SerializeOption) {
-		if len(expressions) < 2 {
-			panic("jet: invalid number of expressions for operator")
-		}
+		jet.Serialize(str, statement, out, options...)
 
-		jet.Serialize(expressions[0], statement, out, options...)
-
-		caseSensitive := false
-
-		if len(expressions) >= 3 {
-			if stringLiteral, ok := expressions[2].(jet.LiteralExpression); ok {
-				caseSensitive = stringLiteral.Value().(bool)
-			}
+		if not {
+			out.WriteString("NOT")
 		}
 
 		out.WriteString("REGEXP")
@@ -166,33 +157,7 @@ func mysqlREGEXPLIKEoperator(expressions ...jet.Serializer) jet.SerializerFunc {
 			out.WriteString("BINARY")
 		}
 
-		jet.Serialize(expressions[1], statement, out, options...)
-	}
-}
-
-func mysqlNOTREGEXPLIKEoperator(expressions ...jet.Serializer) jet.SerializerFunc {
-	return func(statement jet.StatementType, out *jet.SQLBuilder, options ...jet.SerializeOption) {
-		if len(expressions) < 2 {
-			panic("jet: invalid number of expressions for operator")
-		}
-
-		jet.Serialize(expressions[0], statement, out, options...)
-
-		caseSensitive := false
-
-		if len(expressions) >= 3 {
-			if stringLiteral, ok := expressions[2].(jet.LiteralExpression); ok {
-				caseSensitive = stringLiteral.Value().(bool)
-			}
-		}
-
-		out.WriteString("NOT REGEXP")
-
-		if caseSensitive {
-			out.WriteString("BINARY")
-		}
-
-		jet.Serialize(expressions[1], statement, out, options...)
+		jet.Serialize(pattern, statement, out, options...)
 	}
 }
 
diff --git a/mysql/expressions_test.go b/mysql/expressions_test.go
index 39174b6..b51ee54 100644
--- a/mysql/expressions_test.go
+++ b/mysql/expressions_test.go
@@ -48,7 +48,7 @@ func TestRawInvalidArguments(t *testing.T) {
 
 func TestRawType(t *testing.T) {
 	assertSerialize(t, RawBool("table.colInt < :float", RawArgs{":float": 11.22}).IS_FALSE(),
-		"(table.colInt < ?) IS FALSE", 11.22)
+		"((table.colInt < ?) IS FALSE)", 11.22)
 
 	assertSerialize(t, RawFloat("table.colInt + &float", RawArgs{"&float": 11.22}).EQ(Float(3.14)),
 		"((table.colInt + ?) = ?)", 11.22, 3.14)
diff --git a/postgres/cast.go b/postgres/cast.go
index 46abf39..42e1a21 100644
--- a/postgres/cast.go
+++ b/postgres/cast.go
@@ -7,21 +7,19 @@ import (
 	"github.com/go-jet/jet/v2/internal/jet"
 )
 
-type cast struct {
-	jet.Cast
-}
-
 // CAST function converts an expr (of any type) into later specified datatype.
 func CAST(expr Expression) *cast {
-	ret := &cast{}
-	ret.Cast = jet.NewCastImpl(expr)
-
-	return ret
+	return &cast{
+		expr: expr,
+	}
+}
+
+type cast struct {
+	expr Expression
 }
 
-// AS casts expression as castType
 func (b *cast) AS(castType string) Expression {
-	return b.Cast.AS(castType)
+	return jet.AtomicCustomExpression(b.expr, Token("::"+castType))
 }
 
 // AS_BOOL casts expression as bool type
diff --git a/postgres/dialect.go b/postgres/dialect.go
index c5f5085..ebcfa2e 100644
--- a/postgres/dialect.go
+++ b/postgres/dialect.go
@@ -13,15 +13,10 @@ var Dialect = newDialect()
 
 func newDialect() jet.Dialect {
 
-	operatorSerializeOverrides := map[string]jet.SerializeOverride{}
-	operatorSerializeOverrides[jet.StringRegexpLikeOperator] = postgresREGEXPLIKEoperator
-	operatorSerializeOverrides[jet.StringNotRegexpLikeOperator] = postgresNOTREGEXPLIKEoperator
-	operatorSerializeOverrides["CAST"] = postgresCAST
-
 	dialectParams := jet.DialectParams{
 		Name:                       "PostgreSQL",
 		PackageName:                "postgres",
-		OperatorSerializeOverrides: operatorSerializeOverrides,
+		OperatorSerializeOverrides: nil,
 		AliasQuoteChar:             '"',
 		IdentifierQuoteChar:        '"',
 		ArgumentPlaceholder: func(ord int) string {
@@ -49,6 +44,7 @@ func newDialect() jet.Dialect {
 			}
 			return expr
 		},
+		RegexpLike: regexpLike,
 	}
 
 	return jet.NewDialect(dialectParams)
@@ -63,80 +59,23 @@ func argumentToString(value any) (string, bool) {
 	return "", false
 }
 
-func postgresCAST(expressions ...jet.Serializer) jet.SerializerFunc {
+func regexpLike(str jet.StringExpression, not bool, pattern jet.StringExpression, caseSensitive bool) jet.SerializerFunc {
 	return func(statement jet.StatementType, out *jet.SQLBuilder, options ...jet.SerializeOption) {
-		if len(expressions) < 2 {
-			panic("jet: invalid number of expressions for operator")
-		}
+		jet.Serialize(str, statement, out, options...)
 
-		expression := expressions[0]
+		var notOperator string
 
-		litExpr, ok := expressions[1].(jet.LiteralExpression)
-
-		if !ok {
-			panic("jet: cast invalid cast type")
-		}
-
-		castType, ok := litExpr.Value().(string)
-
-		if !ok {
-			panic("jet: cast type is not string")
-		}
-
-		jet.Serialize(expression, statement, out, options...)
-		out.WriteString("::" + castType)
-	}
-}
-
-func postgresREGEXPLIKEoperator(expressions ...jet.Serializer) jet.SerializerFunc {
-	return func(statement jet.StatementType, out *jet.SQLBuilder, options ...jet.SerializeOption) {
-		if len(expressions) < 2 {
-			panic("jet: invalid number of expressions for operator")
-		}
-
-		jet.Serialize(expressions[0], statement, out, options...)
-
-		caseSensitive := false
-
-		if len(expressions) >= 3 {
-			if stringLiteral, ok := expressions[2].(jet.LiteralExpression); ok {
-				caseSensitive = stringLiteral.Value().(bool)
-			}
+		if not {
+			notOperator = "!"
 		}
 
 		if caseSensitive {
-			out.WriteString("~")
+			out.WriteString(notOperator + "~")
 		} else {
-			out.WriteString("~*")
+			out.WriteString(notOperator + "~*")
 		}
 
-		jet.Serialize(expressions[1], statement, out, options...)
-	}
-}
-
-func postgresNOTREGEXPLIKEoperator(expressions ...jet.Serializer) jet.SerializerFunc {
-	return func(statement jet.StatementType, out *jet.SQLBuilder, options ...jet.SerializeOption) {
-		if len(expressions) < 2 {
-			panic("jet: invalid number of expressions for operator")
-		}
-
-		jet.Serialize(expressions[0], statement, out, options...)
-
-		caseSensitive := false
-
-		if len(expressions) >= 3 {
-			if stringLiteral, ok := expressions[2].(jet.LiteralExpression); ok {
-				caseSensitive = stringLiteral.Value().(bool)
-			}
-		}
-
-		if caseSensitive {
-			out.WriteString("!~")
-		} else {
-			out.WriteString("!~*")
-		}
-
-		jet.Serialize(expressions[1], statement, out, options...)
+		jet.Serialize(pattern, statement, out, options...)
 	}
 }
 
diff --git a/postgres/expressions_test.go b/postgres/expressions_test.go
index 3ab361d..f8288c8 100644
--- a/postgres/expressions_test.go
+++ b/postgres/expressions_test.go
@@ -58,7 +58,7 @@ func TestRawInvalidArguments(t *testing.T) {
 
 func TestRawHelperMethods(t *testing.T) {
 	assertSerialize(t, RawBool("table.colInt < :float", RawArgs{":float": 11.22}).IS_FALSE(),
-		"(table.colInt < $1) IS FALSE", 11.22)
+		"((table.colInt < $1) IS FALSE)", 11.22)
 
 	assertSerialize(t, RawFloat("table.colInt + :float", RawArgs{":float": 11.22}).EQ(Float(3.14)),
 		"((table.colInt + $1) = $2)", 11.22, 3.14)
diff --git a/postgres/functions.go b/postgres/functions.go
index b76637b..cfd53b8 100644
--- a/postgres/functions.go
+++ b/postgres/functions.go
@@ -184,12 +184,12 @@ var CHR = jet.CHR
 
 // CONCAT adds two or more expressions together
 var CONCAT = func(expressions ...Expression) StringExpression {
-	return jet.CONCAT(explicitLiteralCasts(expressions...)...)
+	return jet.CONCAT(expressions...)
 }
 
 // CONCAT_WS adds two or more expressions together with a separator.
 func CONCAT_WS(separator Expression, expressions ...Expression) StringExpression {
-	return jet.CONCAT_WS(explicitLiteralCast(separator), explicitLiteralCasts(expressions...)...)
+	return jet.CONCAT_WS(separator, expressions...)
 }
 
 // Character encodings for CONVERT, CONVERT_FROM and CONVERT_TO functions
@@ -239,7 +239,7 @@ var DECODE = jet.DECODE
 
 // FORMAT formats the arguments according to a format string. This function is similar to the C function sprintf.
 func FORMAT(formatStr StringExpression, formatArgs ...Expression) StringExpression {
-	return jet.FORMAT(formatStr, explicitLiteralCasts(formatArgs...)...)
+	return jet.FORMAT(formatStr, formatArgs...)
 }
 
 // INITCAP converts the first letter of each word to upper case
@@ -578,55 +578,19 @@ var EXISTS = jet.EXISTS
 // CASE create CASE operator with optional list of expressions
 var CASE = jet.CASE
 
-func explicitLiteralCasts(expressions ...Expression) []jet.Expression {
-	ret := []jet.Expression{}
-
-	for _, exp := range expressions {
-		ret = append(ret, explicitLiteralCast(exp))
-	}
-
-	return ret
-}
-
-func explicitLiteralCast(expresion Expression) jet.Expression {
-	if _, ok := expresion.(jet.LiteralExpression); !ok {
-		return expresion
-	}
-
-	switch expresion.(type) {
-	case jet.BoolExpression:
-		return CAST(expresion).AS_BOOL()
-	case jet.IntegerExpression:
-		return CAST(expresion).AS_INTEGER()
-	case jet.FloatExpression:
-		return CAST(expresion).AS_NUMERIC()
-	case jet.StringExpression:
-		return CAST(expresion).AS_TEXT()
-	}
-
-	return expresion
-}
-
 // MODE computes the most frequent value of the aggregated argument
 var MODE = jet.MODE
 
 // PERCENTILE_CONT computes a value corresponding to the specified fraction within the ordered set of
 // aggregated argument values. This will interpolate between adjacent input items if needed.
 func PERCENTILE_CONT(fraction FloatExpression) *jet.OrderSetAggregateFunc {
-	return jet.PERCENTILE_CONT(castFloatLiteral(fraction))
+	return jet.PERCENTILE_CONT(fraction)
 }
 
 // PERCENTILE_DISC computes  the first value within the ordered set of aggregated argument values whose position
 // in the ordering equals or exceeds the specified fraction. The aggregated argument must be of a sortable type.
 func PERCENTILE_DISC(fraction FloatExpression) *jet.OrderSetAggregateFunc {
-	return jet.PERCENTILE_DISC(castFloatLiteral(fraction))
-}
-
-func castFloatLiteral(fraction FloatExpression) FloatExpression {
-	if _, ok := fraction.(jet.LiteralExpression); ok {
-		return CAST(fraction).AS_DOUBLE() // to make postgres aware of the type
-	}
-	return fraction
+	return jet.PERCENTILE_DISC(fraction)
 }
 
 // ----------------- Group By operators --------------------------//
diff --git a/postgres/interval_literal_test.go b/postgres/interval_literal_test.go
index 8d6e647..ef4ae1d 100644
--- a/postgres/interval_literal_test.go
+++ b/postgres/interval_literal_test.go
@@ -23,7 +23,7 @@ func TestINTERVAL(t *testing.T) {
 	assertSerialize(t, INTERVAL(1, YEAR, 10, MONTH, 20, DAY), "INTERVAL '1 YEAR 10 MONTH 20 DAY'")
 	assertSerialize(t, INTERVAL(1, YEAR, 10, MONTH, 20, DAY, 3, HOUR), "INTERVAL '1 YEAR 10 MONTH 20 DAY 3 HOUR'")
 
-	assertSerialize(t, INTERVAL(1, YEAR).IS_NOT_NULL(), "INTERVAL '1 YEAR' IS NOT NULL")
+	assertSerialize(t, INTERVAL(1, YEAR).IS_NOT_NULL(), "(INTERVAL '1 YEAR' IS NOT NULL)")
 	assertProjectionSerialize(t, INTERVAL(1, YEAR).AS("one year"), `INTERVAL '1 YEAR' AS "one year"`)
 
 	f := 5.2
diff --git a/postgres/literal.go b/postgres/literal.go
index 1e93110..046231f 100644
--- a/postgres/literal.go
+++ b/postgres/literal.go
@@ -2,9 +2,10 @@ package postgres
 
 import (
 	"fmt"
-	"github.com/lib/pq"
 	"time"
 
+	"github.com/lib/pq"
+
 	"github.com/go-jet/jet/v2/internal/jet"
 )
 
diff --git a/sqlite/cast.go b/sqlite/cast.go
index fb74820..6f53853 100644
--- a/sqlite/cast.go
+++ b/sqlite/cast.go
@@ -4,21 +4,20 @@ import (
 	"github.com/go-jet/jet/v2/internal/jet"
 )
 
-type cast struct {
-	jet.Cast
+// CAST function converts an expr (of any type) into later specified datatype.
+func CAST(expr Expression) *cast {
+	return &cast{
+		expr: expr,
+	}
 }
 
-// CAST function converts a expr (of any type) into latter specified datatype.
-func CAST(expr Expression) *cast {
-	ret := &cast{}
-	ret.Cast = jet.NewCastImpl(expr)
-
-	return ret
+type cast struct {
+	expr Expression
 }
 
 // AS casts expressions to castType
 func (c *cast) AS(castType string) Expression {
-	return c.Cast.AS(castType)
+	return jet.AtomicCustomExpression(Token("CAST("), c.expr, Token("AS "+castType+")"))
 }
 
 // AS_TEXT cast expression to TEXT type
diff --git a/sqlite/expressions_test.go b/sqlite/expressions_test.go
index 0f04df6..922118a 100644
--- a/sqlite/expressions_test.go
+++ b/sqlite/expressions_test.go
@@ -1,8 +1,9 @@
 package sqlite
 
 import (
-	"github.com/stretchr/testify/require"
 	"testing"
+
+	"github.com/stretchr/testify/require"
 )
 
 func TestRaw(t *testing.T) {
@@ -46,7 +47,7 @@ func TestRawInvalidArguments(t *testing.T) {
 
 func TestRawType(t *testing.T) {
 	assertSerialize(t, RawBool("table.colInt < :float", RawArgs{":float": 11.22}).IS_FALSE(),
-		"(table.colInt < ?) IS FALSE", 11.22)
+		"((table.colInt < ?) IS FALSE)", 11.22)
 
 	assertSerialize(t, RawFloat("table.colInt + &float", RawArgs{"&float": 11.22}).EQ(Float(3.14)),
 		"((table.colInt + ?) = ?)", 11.22, 3.14)
diff --git a/tests/postgres/alltypes_test.go b/tests/postgres/alltypes_test.go
index 59d1dd0..46262ff 100644
--- a/tests/postgres/alltypes_test.go
+++ b/tests/postgres/alltypes_test.go
@@ -648,10 +648,10 @@ func TestStringOperators(t *testing.T) {
 		LTRIM(String("Ltrim"), String("A")),
 		RTRIM(String("rtrim")),
 		RTRIM(AllTypes.VarChar, String("B")),
-		CHR(Int(65)),
-		CONCAT(AllTypes.VarCharPtr, AllTypes.VarCharPtr, String("aaa"), Int(1)),
-		CONCAT(Bool(false), Int(1), Float(22.2), String("test test")),
-		CONCAT_WS(String("string1"), Int(1), Float(11.22), String("bytea"), Bool(false)), //Float(11.12)),
+		CHR(Int8(65)),
+		CONCAT(AllTypes.VarCharPtr, AllTypes.VarCharPtr, Text("aaa"), Int8(1)),
+		CONCAT(Bool(false), Int16(1), Real(22.2), Text("test test")),
+		CONCAT_WS(Text("string1"), Int64(1), Real(11.22), Text("bytea"), Bool(false)), //Float(11.12)),
 		CONVERT(Bytea("bytea"), UTF8, LATIN1),
 		CONVERT(AllTypes.Bytea, UTF8, LATIN1),
 		CONVERT_FROM(Bytea("text_in_utf8"), UTF8),
@@ -1117,8 +1117,8 @@ func TestIntegerOperators(t *testing.T) {
 		AllTypes.SmallInt.BIT_XOR(AllTypes.SmallInt).AS("bit xor 1"),
 		AllTypes.SmallInt.BIT_XOR(Int(11)).AS("bit xor 2"),
 
-		BIT_NOT(Int(-1).MUL(AllTypes.SmallInt)).AS("bit_not_1"),
-		BIT_NOT(Int(-11)).AS("bit_not_2"),
+		BIT_NOT(Int32(-1).MUL(AllTypes.SmallInt)).AS("bit_not_1"),
+		BIT_NOT(Int32(-11)).AS("bit_not_2"),
 
 		AllTypes.SmallInt.BIT_SHIFT_LEFT(AllTypes.SmallInt.DIV(Int8(2))).AS("bit shift left 1"),
 		AllTypes.SmallInt.BIT_SHIFT_LEFT(Int(4)).AS("bit shift left 2"),
@@ -1130,8 +1130,6 @@ func TestIntegerOperators(t *testing.T) {
 		CBRT(ABSi(AllTypes.BigInt)).AS("cbrt"),
 	).LIMIT(2)
 
-	// fmt.Println(query.Sql())
-
 	testutils.AssertStatementSql(t, query, `
 SELECT all_types.big_int AS "all_types.big_int",
      all_types.big_int_ptr AS "all_types.big_int_ptr",
@@ -1173,17 +1171,17 @@ SELECT all_types.big_int AS "all_types.big_int",
      (all_types.small_int | $20) AS "bit or 2",
      (all_types.small_int # all_types.small_int) AS "bit xor 1",
      (all_types.small_int # $21) AS "bit xor 2",
-     (~ ($22 * all_types.small_int)) AS "bit_not_1",
-     (~ -11) AS "bit_not_2",
-     (all_types.small_int << (all_types.small_int / $23::smallint)) AS "bit shift left 1",
-     (all_types.small_int << $24) AS "bit shift left 2",
-     (all_types.small_int >> (all_types.small_int / $25)) AS "bit shift right 1",
-     (all_types.small_int >> $26) AS "bit shift right 2",
+     (~ ($22::integer * all_types.small_int)) AS "bit_not_1",
+     (~ $23::integer) AS "bit_not_2",
+     (all_types.small_int << (all_types.small_int / $24::smallint)) AS "bit shift left 1",
+     (all_types.small_int << $25) AS "bit shift left 2",
+     (all_types.small_int >> (all_types.small_int / $26)) AS "bit shift right 1",
+     (all_types.small_int >> $27) AS "bit shift right 2",
      ABS(all_types.big_int) AS "abs",
      SQRT(ABS(all_types.big_int)) AS "sqrt",
      CBRT(ABS(all_types.big_int)) AS "cbrt"
 FROM test_sample.all_types
-LIMIT $27;
+LIMIT $28;
 `)
 
 	var dest []struct {
diff --git a/tests/postgres/chinook_db_test.go b/tests/postgres/chinook_db_test.go
index 3dad8c6..9e491b4 100644
--- a/tests/postgres/chinook_db_test.go
+++ b/tests/postgres/chinook_db_test.go
@@ -2,6 +2,9 @@ package postgres
 
 import (
 	"context"
+	"testing"
+	"time"
+
 	"github.com/bytedance/sonic"
 	"github.com/go-jet/jet/v2/internal/testutils"
 	"github.com/go-jet/jet/v2/internal/utils/ptr"
@@ -10,8 +13,6 @@ import (
 	. "github.com/go-jet/jet/v2/tests/.gentestdata/jetdb/chinook/table"
 	"github.com/go-jet/jet/v2/tests/.gentestdata/jetdb/chinook2/table"
 	"github.com/stretchr/testify/require"
-	"testing"
-	"time"
 )
 
 func TestSelectAlbum(t *testing.T) {
@@ -1301,13 +1302,13 @@ func TestAggregateFunc(t *testing.T) {
 	skipForCockroachDB(t)
 
 	stmt := SELECT(
-		PERCENTILE_DISC(Float(0.1)).WITHIN_GROUP_ORDER_BY(Invoice.InvoiceId).AS("percentile_disc_1"),
+		PERCENTILE_DISC(Double(0.1)).WITHIN_GROUP_ORDER_BY(Invoice.InvoiceId).AS("percentile_disc_1"),
 		PERCENTILE_DISC(Invoice.Total.DIV(Float(100))).WITHIN_GROUP_ORDER_BY(Invoice.InvoiceDate.ASC()).AS("percentile_disc_2"),
 		PERCENTILE_DISC(RawFloat("(select array_agg(s) from generate_series(0, 1, 0.2) as s)")).
 			WITHIN_GROUP_ORDER_BY(Invoice.BillingAddress.DESC()).AS("percentile_disc_3"),
 
-		PERCENTILE_CONT(Float(0.3)).WITHIN_GROUP_ORDER_BY(Invoice.Total).AS("percentile_cont_1"),
-		PERCENTILE_CONT(Float(0.2)).WITHIN_GROUP_ORDER_BY(INTERVAL(1, HOUR).DESC()).AS("percentile_cont_interval"),
+		PERCENTILE_CONT(Double(0.3)).WITHIN_GROUP_ORDER_BY(Invoice.Total).AS("percentile_cont_1"),
+		PERCENTILE_CONT(Double(0.2)).WITHIN_GROUP_ORDER_BY(INTERVAL(1, HOUR).DESC()).AS("percentile_cont_interval"),
 
 		MODE().WITHIN_GROUP_ORDER_BY(Invoice.BillingPostalCode.DESC()).AS("mode_1"),
 	).FROM(