dongjoon-hyun opened a new pull request #24773: [SPARK-24544][SQL][FOLLOWUP] 
Remove a wrong warning on Hive fallback lookup
URL: https://github.com/apache/spark/pull/24773
 
 
   ## What changes were proposed in this pull request?
   
   This PR is a follow-up of https://github.com/apache/spark/pull/21790 which 
causes a regression to show misleading warnings always at first invocation for 
all Hive function. Hive fallback lookup should not be warned. It's a normal 
process in function lookups.
   
   **CURRENT (Showing `NoSuchFunctionException` and working)**
   ```scala
   scala> sql("select histogram_numeric(a,2) from values(1) T(a)").show
   19/06/02 22:02:10 WARN HiveSessionCatalog: Encountered a failure during 
looking up function: 
org.apache.spark.sql.catalyst.analysis.NoSuchFunctionException: Undefined 
function: 'histogram_numeric'. This function is neither a registered temporary 
function nor a permanent function registered in the database 'default'.;
        at 
org.apache.spark.sql.catalyst.catalog.SessionCatalog.failFunctionLookup(SessionCatalog.scala:1234)
        at 
org.apache.spark.sql.catalyst.catalog.SessionCatalog.lookupFunction(SessionCatalog.scala:1302)
        at ...
   +------------------------+
   |histogram_numeric( a, 2)|
   +------------------------+
   |            [[1.0, 1.0]]|
   +------------------------+
   ```
   
   ## How was this patch tested?
   
   Manually execute the above query.

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