Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/13706#discussion_r118989451
--- 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)) {
+ throw new AnalysisException(s"Function $name already exists")
+ }
+ functionRegistry.registerFunction(name, info, functionBuilder)
+ }
+
+ /** Drop a temporary macro. */
+ def dropTempMacro(name: String, ignoreIfNotExists: Boolean): Unit = {
+ if (!functionRegistry.dropMacro(name) && !ignoreIfNotExists) {
+ throw new NoSuchTempMacroException(name)
--- End diff --
```
hive> DROP TEMPORARY MACRO max;
OK
Time taken: 0.01 seconds
hive> select max(3) from t1;
OK
3
```
After we drop the macro, the existing function works well. That means, we
did not delete the original built-in functions. The built-in function will not
be dropped by ` DROP TEMPORARY MACRO`. After we drop the macro with the same
name, the original function `max` is using the original built-in function.
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