vvysotskyi commented on issue #1971: DRILL-7572: JSON structure parser URL: https://github.com/apache/drill/pull/1971#issuecomment-587353797 @paul-rogers, thanks for the explanation, it is great that EVF will handle such case without additional changes. Regarding `supportsCountPushDown()`, for Parquet we already have a rule which replaces scan with a count by the direct scan with the value from the metadata. The complexity appears when we have count by column. In this case, only statistics may help. The rule mentioned above is `ConvertCountToDirectScanPrule`. The good news is that when Metastore will be supported for other non-parquet format plugins, it became possible to use its metadata for such optimizations. By the way, looks like changes for the first CR round weren't pushed.
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