adriangb opened a new issue, #19089:
URL: https://github.com/apache/datafusion/issues/19089
When scanning a Parquet file, if from statistics we can deduce that a column
is constant we can replace `col("a")` with `lit(123)`. This (1) reduces data
transfer/reads (even if it would be compressed in Parquet, etc.) and (2) we
might be able to do interesting stuff with statistics pruning.
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