Thank you, Ning and John for your valuable information. I will try map function first:)
Ping On Fri, Sep 24, 2010 at 10:53 AM, John Sichi <jsi...@facebook.com> wrote: > There are also undocumented "constructor" functions named map, struct, and > array. These instantiate complex types directly: > > > hive> describe function map; > OK > map(key0, value0, key1, value1...) - Creates a map with the given key/value > pairs > hive> describe function struct; > OK > struct(col1, col2, col3, ...) - Creates a struct with the given field > values > Time taken: 0.072 seconds > hive> describe function array; > OK > array(n0, n1...) - Creates an array with the given elements > Time taken: 0.071 seconds > > I'll add them to the wiki. > > JVS > > On Sep 24, 2010, at 10:10 AM, Ning Zhang wrote: > > Ping, you cannot insert complex type column by manually input the data. > You'll need to have the complex typed data stored in some file first (e.g., > using Thrift serialization or Protocol Buffers), and then load into the > table. > > Another option you have is to use JSON/XML to represent map. Hive has > UDF/UDTF to support extracting data from JSON/XML (json_object, json_tuple, > xpath_string, xpath_int ...). hive> show functions; and hive> desc > <func_name> will give you more info about these UDFs. > > On Sep 23, 2010, at 5:12 PM, Ping Zhu wrote: > > Hi, > > Can we insert data into a column of complex type (eg map type) through > hive command line? The only related article I can find is at > http://www.mail-archive.com/common-comm...@hadoop.apache.org/msg01031.html: > "The tables with columns that are an instance of a complex type can only > be created programmatically and NOT through hive command line at this > time'''. We will be adding ability to add such tables through the hive > command line in the future. " > > Any new progress on this feature? > > Thanks for your information and help. > > Ping > > > >
