Github user lianhuiwang commented on the issue:
https://github.com/apache/spark/pull/13494
@cloud-fan Now i have added a extendedHiveOptimizerRules that include
MetadataOnly Optimization for Hive Optimizer.
Firstly,MetadataOnly Optimization should be in Hive Model because
MetastoreRelation only can be used in Hive now.
Secondly, MetadataOnly Optimization should be between Analyzer and
RewriteDistinctAggregates.
In the future, we can add ParquetConversions/OrcConversions and other
optimizations into extendedHiveOptimizerRules.
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