liukun4515 commented on code in PR #3222:
URL: https://github.com/apache/arrow-datafusion/pull/3222#discussion_r954778454
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datafusion/core/src/execution/context.rs:
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@@ -1377,6 +1378,8 @@ impl SessionState {
}
rules.push(Arc::new(ReduceOuterJoin::new()));
rules.push(Arc::new(FilterPushDown::new()));
+ // we do type coercion after filter push down so that we don't push
CAST filters to Parquet
Review Comment:
For example, `Filter expr: FLOAT32(C1) < FLOAT64(16)`. We should do type
coercion first and convert the filter expr to `CAST(INT32(C1) AS FLOAT64 <
FLOAT64(16)` and try to push the new filter expr to the table scan operation.
If you don't do the type coercion first, you will push the `expr:
FLOAT32(C1) < FLOAT64(16)` to table scan, Does this can be applied to the
parquet filter or pruning filter?
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