Re: [PR] Fix duplicated schema name error from count wildcard [datafusion]

["jayzhan211 (via GitHub)" <gi...@apache.org>]

jayzhan211 commented on code in PR #14824:
URL: https://github.com/apache/datafusion/pull/14824#discussion_r1966519181


##########
datafusion/physical-plan/src/aggregates/mod.rs:
##########
@@ -1231,6 +1233,13 @@ fn evaluate(
     expr: &[Arc<dyn PhysicalExpr>],
     batch: &RecordBatch,
 ) -> Result<Vec<ArrayRef>> {
+    // handle count() case
+    if expr.is_empty() {
+        return Ok(vec![
+            Arc::new(Int64Array::from(vec![1; batch.num_rows()])) as ArrayRef

Review Comment:
   This is equivalent to `count(1)` case



##########
datafusion/physical-plan/src/aggregates/no_grouping.rs:
##########
@@ -219,23 +220,26 @@ fn aggregate_batch(
                 None => Cow::Borrowed(&batch),
             };
 
+            let n_rows = batch.num_rows();
+
             // 1.3
-            let values = &expr
-                .iter()
-                .map(|e| {
-                    e.evaluate(&batch)
-                        .and_then(|v| v.into_array(batch.num_rows()))
-                })
-                .collect::<Result<Vec<_>>>()?;
+            // Handle count(*) case
+            let values = if expr.is_empty() {
+                vec![Arc::new(Int64Array::from(vec![1; n_rows])) as ArrayRef]

Review Comment:
   This is equivalent to count(1) case



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