Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/13706#discussion_r118989143
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -1090,6 +1090,24 @@ class SessionCatalog(
}
}
+ /** Create a temporary macro. */
+ def createTempMacro(
+ name: String,
+ info: ExpressionInfo,
+ functionBuilder: FunctionBuilder): Unit = {
+ if (functionRegistry.functionExists(name)) {
--- End diff --
```
hive> create temporary macro max(x int)
> x*x;
OK
Time taken: 0.014 seconds
hive> select max(3) from t1;
OK
9
Time taken: 0.468 seconds, Fetched: 1 row(s)
hive> select max(3,4) from t1;
FAILED: SemanticException [Error 10015]: Line 1:7 Arguments length mismatch
'4': The macro max accepts exactly 1 arguments.
```
Hive overwrites the temporary function
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