[
https://issues.apache.org/jira/browse/HIVE-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772857#action_12772857
]
Zheng Shao commented on HIVE-554:
---------------------------------
I mean the functions like this. We can build the string in a little different
way. (It applies to both array and map).
I don't think we need JSON format in the explain result, since the expression
in explain result is not in JSON anyway.
{code}
+ public String getDisplayString(String[] children) {
+ StringBuilder sb = new StringBuilder();
+ sb.append("[");
+ for(int i=0; i<children.length; i++) {
+ sb.append(children[i]);
+ if(i+1 != children.length) {
+ sb.append(",");
+ }
+ }
+ sb.append("]");
+ return sb.toString();
+ }
+}
+ public String getDisplayString(String[] children) {
+ StringBuilder sb = new StringBuilder();
+ sb.append("[");
+ for(int i=0; i<children.length; i++) {
+ sb.append(children[i]);
+ if(i+1 != children.length) {
+ sb.append(",");
+ }
+ }
+ sb.append("]");
+ return sb.toString();
+ }
+}
{code}
> Add GenericUDF to create arrays, maps, and structs
> --------------------------------------------------
>
> Key: HIVE-554
> URL: https://issues.apache.org/jira/browse/HIVE-554
> Project: Hadoop Hive
> Issue Type: New Feature
> Reporter: Zheng Shao
> Assignee: Paul Yang
> Attachments: HIVE-554.1.patch
>
>
> Here is an example:
> {code}
> SELECT array(1,2,3)[3], map("a":1,"b":2,"c":3)["a"], struct(user_id:3,
> revenue: sum(rev))
> FROM table
> GROUP BY user_id;
> {code}
> This is relatively easy to do with the GenericUDF framework, and will greatly
> increase the flexibility of the language.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
