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[SPARK-20986][SQL] Reset table's statistics after PruneFileSourcePart…
…itions rule. ## What changes were proposed in this pull request? After PruneFileSourcePartitions rule, It needs reset table's statistics because PruneFileSourcePartitions can filter some unnecessary partitions. So the statistics need to be changed. ## How was this patch tested? add unit test. Author: lianhuiwang <lianhuiwang09@gmail.com> Closes apache#18205 from lianhuiwang/SPARK-20986.
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