Explain EXPLAIN (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier points
    Function pointInPolygon (children 1)
     ExpressionList (children 2)
      Function tuple (children 1)
       ExpressionList (children 2)
        Identifier x
        Identifier y
      Function array (children 1)
       ExpressionList (children 4)
        Literal Tuple_(UInt64_0, UInt64_0)
        Literal Tuple_(UInt64_0, UInt64_150)
        Literal Tuple_(UInt64_150, UInt64_150)
        Literal Tuple_(UInt64_150, UInt64_0)
