jet/internal/jet/row_expression.go
2024-10-17 14:17:22 +02:00

102 lines
2.9 KiB
Go

package jet
// RowExpression interface
type RowExpression interface {
Expression
HasProjections
EQ(rhs RowExpression) BoolExpression
NOT_EQ(rhs RowExpression) BoolExpression
IS_DISTINCT_FROM(rhs RowExpression) BoolExpression
IS_NOT_DISTINCT_FROM(rhs RowExpression) BoolExpression
LT(rhs RowExpression) BoolExpression
LT_EQ(rhs RowExpression) BoolExpression
GT(rhs RowExpression) BoolExpression
GT_EQ(rhs RowExpression) BoolExpression
}
type rowInterfaceImpl struct {
parent Expression
dialect Dialect
elemCount int
}
func (n *rowInterfaceImpl) EQ(rhs RowExpression) BoolExpression {
return Eq(n.parent, rhs)
}
func (n *rowInterfaceImpl) NOT_EQ(rhs RowExpression) BoolExpression {
return NotEq(n.parent, rhs)
}
func (n *rowInterfaceImpl) IS_DISTINCT_FROM(rhs RowExpression) BoolExpression {
return IsDistinctFrom(n.parent, rhs)
}
func (n *rowInterfaceImpl) IS_NOT_DISTINCT_FROM(rhs RowExpression) BoolExpression {
return IsNotDistinctFrom(n.parent, rhs)
}
func (n *rowInterfaceImpl) GT(rhs RowExpression) BoolExpression {
return Gt(n.parent, rhs)
}
func (n *rowInterfaceImpl) GT_EQ(rhs RowExpression) BoolExpression {
return GtEq(n.parent, rhs)
}
func (n *rowInterfaceImpl) LT(rhs RowExpression) BoolExpression {
return Lt(n.parent, rhs)
}
func (n *rowInterfaceImpl) LT_EQ(rhs RowExpression) BoolExpression {
return LtEq(n.parent, rhs)
}
func (n *rowInterfaceImpl) projections() ProjectionList {
var ret ProjectionList
for i := 0; i < n.elemCount; i++ {
rowColumn := NewColumnImpl(n.dialect.ValuesDefaultColumnName(i), "", nil)
ret = append(ret, &rowColumn)
}
return ret
}
// ---------------------------------------------------//
type rowExpressionWrapper struct {
rowInterfaceImpl
Expression
}
func newRowExpression(name string, dialect Dialect, expressions ...Expression) RowExpression {
ret := &rowExpressionWrapper{}
ret.rowInterfaceImpl.parent = ret
ret.Expression = NewFunc(name, expressions, ret)
ret.dialect = dialect
ret.elemCount = len(expressions)
return ret
}
// ROW function is used to create a tuple value that consists of a set of expressions or column values.
func ROW(dialect Dialect, expressions ...Expression) RowExpression {
return newRowExpression("ROW", dialect, expressions...)
}
// WRAP creates row expressions without ROW keyword `( expression1, expression2, ... )`.
func WRAP(dialect Dialect, expressions ...Expression) RowExpression {
return newRowExpression("", dialect, expressions...)
}
// RowExp serves as a wrapper for an arbitrary expression, treating it as a row expression.
// This enables the Go compiler to interpret any expression as a row expression
// Note: This does not modify the generated SQL builder output by adding a SQL CAST operation.
func RowExp(expression Expression) RowExpression {
rowExpressionWrap := rowExpressionWrapper{Expression: expression}
rowExpressionWrap.rowInterfaceImpl.parent = &rowExpressionWrap
return &rowExpressionWrap
}