(you don't have to strictly follow this form)

执行 Select count(*) / count(1) from table 时，因为 Spark 并不会有 base schema 信息，CH 这端会报错：
Columns is empty: While executing ParquetBlockInputFormat: While executing BatchParquetFileSource

如果带有字段的查询，则没有问题：
Select count(*) / count(1) from table where a = 1。

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