SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function JSONExtract (children 1)
     ExpressionList (children 2)
      Literal \'{"a":123456, "b":3.55}\'
      Literal \'Tuple(a LowCardinality(Int32), b Decimal(5, 2))\'