Chalcy, I don't know of an existing UDF that lists all keys and values of a map. You may want to check ql/src/java/org/apache/hadoop/hive/ql/udf in Hive source to double check. But, as you might have guessed, it'd be pretty straightforward to do that in your own UDF:-)
Mark ----- Original Message ----- From: "Chalcy Raja" <chalcy.r...@careerbuilder.com> To: "user@hive.apache.org" <user@hive.apache.org> Sent: Wednesday, November 23, 2011 11:14:09 AM Subject: RE: hive map field question Thanks, Mark. I'll try that. Also, is there a way to list all the keys and values in a map field? Thanks, Chalcy -----Original Message----- From: Mark Grover [mailto:mgro...@oanda.com] Sent: Wednesday, November 23, 2011 11:01 AM To: user@hive.apache.org Subject: Re: hive map field question Hi Chalcy, You could write a UDF that takes in a Map object and returns you the string you need. Alternatively, you could use Hive Transform. Details here:https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Transform When a map gets passed to your custom transform script, you could read it as a serialized string. Mark ----- Original Message ----- From: "Chalcy Raja" <chalcy.r...@careerbuilder.com> To: user@hive.apache.org Sent: Wednesday, November 23, 2011 10:48:07 AM Subject: hive map field question Hello HiveUsers, I have a need to convert a map<string,string> field to string field and vice versa in a hive table. I could not do cast. I created two external tables with one has string and another map. I can join both to get what I want, takes a long time. Any ideas of how it can be done efficiently ? Thanks, Chalcy
