SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function JSONExtract (alias json) (children 1)
     ExpressionList (children 2)
      Identifier data
      Literal \'Tuple( a LowCardinality(String), b LowCardinality(String), c LowCardinality(String), d LowCardinality(String) )\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_low_cardinality_string