SelectWithUnionQuery (children 1) ExpressionList (children 1) SelectQuery (children 3) ExpressionList (children 1) Function format (children 1) ExpressionList (children 4) Literal \'Hello {} World {} {}{}\' Literal \'first\' Literal \'second\' Literal \'third\' TablesInSelectQuery (children 1) TablesInSelectQueryElement (children 1) TableExpression (children 1) TableIdentifier system.numbers Literal UInt64_2