Function nodeUpdate

server/ast/update.go:25–94

nodeUpdate handles *tree.Update nodes.

(ctx *Context, node *tree.Update)

// nodeUpdate handles *tree.Update nodes.
func nodeUpdate(ctx *Context, node *tree.Update) (update *vitess.Update, err error) {
	if node == nil {
		return nil, nil
	}
	ctx.Auth().PushAuthType(auth.AuthType_UPDATE)
	defer ctx.Auth().PopAuthType()

	var returningExprs vitess.SelectExprs
	if returning, ok := node.Returning.(*tree.ReturningExprs); ok {
		returningExprs, err = nodeSelectExprs(ctx, tree.SelectExprs(*returning))
		if err != nil {
			return nil, err
		}
	}

	with, err := nodeWith(ctx, node.With)
	if err != nil {
		return nil, err
	}
	table, err := nodeTableExpr(ctx, node.Table)
	if err != nil {
		return nil, err
	}

	tableExprs := vitess.TableExprs{table}
	if len(node.From) > 0 {
		vitessTableExprs := make(vitess.TableExprs, len(node.From))
		for i, tableExpr := range node.From {
			vitessTableExpr, err := nodeTableExpr(ctx, tableExpr)
			if err != nil {
				return nil, err
			}
			vitessTableExprs[i] = vitessTableExpr
		}

		tableExprs = []vitess.TableExpr{
			&vitess.JoinTableExpr{
				Join:      vitess.JoinStr,
				LeftExpr:  buildJoinTableExpressionTree(ctx, vitessTableExprs),
				RightExpr: table,
			},
		}
	}

	exprs, err := nodeUpdateExprs(ctx, node.Exprs)
	if err != nil {
		return nil, err
	}
	where, err := nodeWhere(ctx, node.Where)
	if err != nil {
		return nil, err
	}
	orderBy, err := nodeOrderBy(ctx, node.OrderBy)
	if err != nil {
		return nil, err
	}
	limit, err := nodeLimit(ctx, node.Limit)
	if err != nil {