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https://issues.apache.org/jira/browse/HIVE-655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779169#action_12779169
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Namit Jain commented on HIVE-655:
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/**
121 * forwardUDTFOutput is
typically called indirectly by the GenericUDTF when
122 * the GenericUDTF has generated
output data that should be passed on to the
123 * next operator in the DAG.
124 *
125 * @param o
126 * @throws HiveException
127 */
128 public void
forwardUDTFOutput(Object o) throws HiveException {
129 // Now that we have the data
for the UDTF, repack the row by including
130 // the columns not used by the
UDTF.
131 StandardStructObjectInspector
soi =
132 (StandardStructObjectInspector)
inputObjInspectors[previousTag];
133 List<Object> newRow = new
ArrayList<Object>();
134 List<? extends StructField>
fields = soi.getAllStructFieldRefs();
135 boolean insertedUDTFCol =
false;
136
137 for(StructField sf : fields) {
138
if(udtfInputColNamesSet.contains(sf.getFieldName())) {
139 if(!insertedUDTFCol) {
140 newRow.add(o);
141 insertedUDTFCol = true;
142 }
143 } else {
144
newRow.add(soi.getStructFieldData(previousRow, sf));
145 }
146 }
147 forward(newRow,
outputObjInspector);
148 }
149
Are we planning to support:
select udtf(..) as (a,b)...
select udtf(..) as (a int,b int)...
If not, why do you need previousTag etc.
> Add support for user defined table generating functions
> -------------------------------------------------------
>
> Key: HIVE-655
> URL: https://issues.apache.org/jira/browse/HIVE-655
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Raghotham Murthy
> Assignee: Paul Yang
> Attachments: HIVE-655.1.patch, HIVE-655.2.patch, HIVE-655.3.patch
>
>
> Provide a way for users to add a table generating function, i.e., functions
> that generate multiple rows from a single input row. Currently, the only way
> to do it is via the TRANSFORM clause which requires streaming the data.
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