SelectWithUnionQuery (children 1) ExpressionList (children 1) SelectQuery (children 2) ExpressionList (children 2) Identifier number Function neighbor (children 1) ExpressionList (children 3) Function toString (children 1) ExpressionList (children 1) Identifier number Literal UInt64_5 Function concat (children 1) ExpressionList (children 2) Literal \'Hello \' Function toString (children 1) ExpressionList (children 1) Identifier number TablesInSelectQuery (children 1) TablesInSelectQueryElement (children 1) TableExpression (children 1) Function numbers (children 1) ExpressionList (children 1) Literal UInt64_10