Improvements on sub-query projection reference.

sqlbuilder/expression_table.go

@@ -6,19 +6,29 @@ type ExpressionTable interface {
 	ReadableTable
 
 	Alias() string
+
+	AllColumns() ProjectionList
 }
 
 type expressionTableImpl struct {
 	readableTableInterfaceImpl
 	expression Expression
 	alias      string
+
+	projections []projection
 }
 
-func newExpressionTable(expression Expression, alias string) ExpressionTable {
+func newExpressionTable(expression Expression, alias string, projections []projection) ExpressionTable {
 	expTable := &expressionTableImpl{expression: expression, alias: alias}
 
 	expTable.readableTableInterfaceImpl.parent = expTable
 
+	for _, projection := range projections {
+		newProjection := projection.from(expTable)
+
+		expTable.projections = append(expTable.projections, newProjection)
+	}
+
 	return expTable
 }
 
@@ -26,6 +36,14 @@ func (e *expressionTableImpl) Alias() string {
 	return e.alias
 }
 
+func (e *expressionTableImpl) columns() []Column {
+	return nil
+}
+
+func (e *expressionTableImpl) AllColumns() ProjectionList {
+	return e.projections
+}
+
 func (e *expressionTableImpl) serialize(statement statementType, out *queryData, options ...serializeOption) error {
 	if e == nil {
 		return errors.New("Expression table is nil. ")