CreateQuery table_with_string_key (children 3)
 Identifier table_with_string_key
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration int_key (children 1)
    DataType Int8
   ColumnDeclaration str_key (children 1)
    DataType String
   ColumnDeclaration value (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier int_key
    Identifier str_key
