cloud-fan commented on issue #24715: [SPARK-25474][SQL] Data source tables support fallback to HDFS for size estimation URL: https://github.com/apache/spark/pull/24715#issuecomment-522414331 Actually, can we really fallback to HDFS size for partitioned tables? The partitions can be external (the partition directory is outside of the table directory), we can only get the file size by getting all the partition information from the metastore, which is very expensive. Maybe this is the reason why `fallBackToHDFS` is false by default.
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