Function nodeSelect

server/ast/select.go:29–75

nodeSelect handles *tree.Select nodes.

(ctx *Context, node *tree.Select)

// nodeSelect handles *tree.Select nodes.
func nodeSelect(ctx *Context, node *tree.Select) (vitess.SelectStatement, error) {
	if node == nil {
		return nil, nil
	}
	if node.Select == nil {
		node.Select = &tree.ValuesClause{
			Rows: []tree.Exprs{},
		}
	}
	selectStmt, err := nodeSelectStatement(ctx, node.Select)
	if err != nil {
		return nil, err
	}
	orderBy, err := nodeOrderBy(ctx, node.OrderBy)
	if err != nil {
		return nil, err
	}
	with, err := nodeWith(ctx, node.With)
	if err != nil {
		return nil, err
	}
	limit, err := nodeLimit(ctx, node.Limit)
	if err != nil {
		return nil, err
	}
	_, err = nodeLockingClause(ctx, node.Locking)
	if err != nil {
		return nil, err
	}

	switch selectStmt := selectStmt.(type) {
	case *vitess.ParenSelect:
		return selectStmt, nil
	case *vitess.Select:
		selectStmt.OrderBy = orderBy
		selectStmt.With = with
		selectStmt.Limit = limit
		return selectStmt, nil
	case *vitess.SetOp:
		selectStmt.OrderBy = orderBy
		selectStmt.With = with
		selectStmt.Limit = limit
		return selectStmt, nil
	default:
		return nil, errors.Errorf("SELECT has encountered an unknown clause: `%T`", selectStmt)
	}
}

// nodeSelectStatement handles tree.SelectStatement nodes.
func nodeSelectStatement(ctx *Context, node tree.SelectStatement) (vitess.SelectStatement, error) {