In case of CatalogFileIndex datasource table, sizeInBytes is always coming as default size in bytes, which is 8.0EB (Even when the user give fallBackToHdfsForStatsEnabled=true) . So, the datasource table which has CatalogFileIndex, always prefer SortMergeJoin, instead of BroadcastJoin, even though the size is below broadcast join threshold.
In this PR, In case of CatalogFileIndex table, if we enable "fallBackToHdfsForStatsEnabled=true", then the computeStatistics get the sizeInBytes from the hdfs and we get the actual size of the table. Hence, during join operation, when the table size is below broadcast threshold, it will prefer broadCastHashJoin instead of SortMergeJoin.
Added UT
Closes#22502 from shahidki31/SPARK-25474.
Authored-by: shahid <shahidki31@gmail.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
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