Method walkNode

datasource/sqlite/sqlrewrite.go:197–222

Walk() an expression, and its logic to create an appropriately nested bson document for mongo queries if possible. - if can't express logic we need to allow qlbridge to poly-fill

(cur expr.Node)

// - if can't express logic we need to allow qlbridge to poly-fill
//
func (m *rewrite) walkNode(cur expr.Node) (expr.Node, error) {
	//u.Debugf("WalkNode: %#v", cur)
	switch curNode := cur.(type) {
	case *expr.NumberNode, *expr.StringNode:
		return curNode, nil
	case *expr.BinaryNode:
		return m.walkFilterBinary(curNode)
	case *expr.TriNode: // Between
		return m.walkFilterTri(curNode)
	case *expr.UnaryNode:
		//return m.walkUnary(curNode)
		u.Warnf("not implemented: %#v", curNode)
		return nil, fmt.Errorf("Not implemented urnary function: %v", curNode.String())
	case *expr.FuncNode:
		return m.walkFilterFunc(curNode)
	case *expr.IdentityNode:
		u.Warnf("we are trying to project?   %v", curNode.String())
		return curNode, nil
	case *expr.ArrayNode:
		return m.walkArrayNode(curNode)
	default:
		u.Debugf("unrecognized T:%T  %v", cur, cur)
	}

	return cur, nil
}

// Tri Nodes expressions:
//