[MySQL] Add support for WITH statements and Common Table Expressions.

mysql/with_statement.go

@@ -0,0 +1,26 @@
+package mysql
+
+import "github.com/go-jet/jet/internal/jet"
+
+// CommonTableExpression contains information about a CTE.
+type CommonTableExpression struct {
+	readableTableInterfaceImpl
+	jet.CommonTableExpression
+}
+
+// WITH function creates new WITH statement from list of common table expressions
+func WITH(cte ...jet.CommonTableExpressionDefinition) func(statement jet.SerializerStatement) Statement {
+	return jet.WITH(Dialect, cte...)
+}
+
+// CTE creates new named CommonTableExpression
+func CTE(name string) CommonTableExpression {
+	cte := CommonTableExpression{
+		readableTableInterfaceImpl: readableTableInterfaceImpl{},
+		CommonTableExpression:      jet.CTE(name),
+	}
+
+	cte.parent = &cte
+
+	return cte
+}