liukun4515 commented on code in PR #3470:
URL: https://github.com/apache/arrow-datafusion/pull/3470#discussion_r970801224
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datafusion/core/src/physical_plan/file_format/row_filter.rs:
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@@ -202,7 +202,18 @@ impl<'a> ExprRewriter for FilterCandidateBuilder<'a> {
fn mutate(&mut self, expr: Expr) -> Result<Expr> {
if let Expr::Column(Column { name, .. }) = &expr {
if self.file_schema.field_with_name(name).is_err() {
- return Ok(Expr::Literal(ScalarValue::Null));
+ // the column expr must be in the table schema
+ return match self.table_schema.field_with_name(name) {
Review Comment:
> > If the expr matched the Expr::Column, it must be matched to a column in
the table schema.
>
> This is not the case. The table schema is the schema prior to adding any
projected columns. So if a predicate references a projected column then it
won't be in the table schema
Do you means that `select a+3 from table where a+3 > 4`? or `select a from
table abs(b) > 4`?
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