Ted-Jiang commented on code in PR #3780:
URL: https://github.com/apache/arrow-datafusion/pull/3780#discussion_r995579711
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datafusion/core/src/physical_plan/file_format/parquet.rs:
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@@ -460,6 +498,20 @@ impl FileOpener for ParquetOpener {
}
}
+// Check PruningPredicates just work on one column.
+fn check_page_index_push_down_valid(predicate: &Option<PruningPredicate>) ->
bool {
+ if let Some(predicate) = predicate {
+ // for now we only support pushDown on one col, because each col may
have different page numbers, its hard to get
+ // `num_containers` from `PruningStatistics`.
+ let cols = predicate.need_input_columns_ids();
+ //Todo more specific rules
Review Comment:
> So among other things, this implies we probably want to break the pruning
predicate down into conjuncts (aka split on AND) to try and isolate predicates
that refer only to a single column
Yes, i used to think it has been done in `FilterPushDownRule`, like break
like rewrite the filter-expr to CNF( I means top level `operator` are all
`and`).
But after check the code, i am wrong there not any split logic in `logical
plan`, i think we should do this in logical plan optimizer like in `filter
pushdown` as early as possible and do it once🤔
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