okumin commented on code in PR #4938:
URL: https://github.com/apache/hive/pull/4938#discussion_r1426123007
##########
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDTFStack.java:
##########
@@ -63,13 +64,21 @@ public StructObjectInspector initialize(ObjectInspector[]
args)
}
if (!(args[0] instanceof ConstantObjectInspector)) {
throw new UDFArgumentException(
+ "The first argument to STACK() must be a constant.");
Review Comment:
The first argument, # of rows to be generated from a single row, defines the
final schema. That's why it must be evaluated at compile time.
```
0: jdbc:hive2://hive-hiveserver2:10000/defaul> select stack(2, 'a', 'b',
'c', 'd', 'e', 'f');
...
+-------+-------+-------+
| col0 | col1 | col2 |
+-------+-------+-------+
| a | b | c |
| d | e | f |
+-------+-------+-------+
2 rows selected (3.979 seconds)
0: jdbc:hive2://hive-hiveserver2:10000/defaul> select stack(3, 'a', 'b',
'c', 'd', 'e', 'f');
...
+-------+-------+
| col0 | col1 |
+-------+-------+
| a | b |
| c | d |
| e | f |
+-------+-------+
```
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