SelectWithUnionQuery (children 2) ExpressionList (children 1) SelectQuery (children 2) ExpressionList (children 1) Function substringUTF8 (children 1) ExpressionList (children 3) Literal \'hello, п�иве�\' Literal Int64_-9223372036854775808 Identifier number TablesInSelectQuery (children 1) TablesInSelectQueryElement (children 1) TableExpression (children 1) Function numbers (children 1) ExpressionList (children 1) Literal UInt64_16 Identifier Null