Weijun-H commented on code in PR #10260:
URL: https://github.com/apache/datafusion/pull/10260#discussion_r1581828836
##########
datafusion/core/src/dataframe/mod.rs:
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@@ -534,7 +534,7 @@ impl DataFrame {
vec![],
original_schema_fields
.clone()
- .map(|f| count(is_null(col(f.name()))).alias(f.name()))
+ .map(|f| count_null(col(f.name())).alias(f.name()))
Review Comment:
When using `count`, it sums all `non-null` Expr while `is_null` converts
`Expr` to a boolean expression, which is why it doesn't work.
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