SelectWithUnionQuery (children 1) ExpressionList (children 1) SelectQuery (children 3) ExpressionList (children 2) Identifier _shard_num Asterisk TablesInSelectQuery (children 1) TablesInSelectQueryElement (children 1) TableExpression (children 1) Function remote (children 1) ExpressionList (children 2) Literal \'127.0.0.{1,2}\' Identifier system.one ExpressionList (children 1) OrderByElement (children 1) Identifier _shard_num