pepijnve commented on code in PR #18329:
URL: https://github.com/apache/datafusion/pull/18329#discussion_r2470322806
##########
datafusion/physical-expr/src/expressions/case.rs:
##########
@@ -845,6 +937,79 @@ impl CaseExpr {
result_builder.finish()
}
+ /// See [CaseExpr::expr_or_expr].
+ fn expr_or_expr(
+ &self,
+ batch: &RecordBatch,
+ when_value: &BooleanArray,
+ return_type: &DataType,
+ ) -> Result<ColumnarValue> {
+ let then_value = self.when_then_expr[0]
+ .1
+ .evaluate_selection(batch, when_value)?
+ .into_array(batch.num_rows())?;
+
+ // evaluate else expression on the values not covered by when_value
+ let remainder = not(when_value)?;
+ let e = self.else_expr.as_ref().unwrap();
+ // keep `else_expr`'s data type and return type consistent
+ let expr = try_cast(Arc::clone(e), &batch.schema(),
return_type.clone())
+ .unwrap_or_else(|_| Arc::clone(e));
+ let else_ = expr
+ .evaluate_selection(batch, &remainder)?
+ .into_array(batch.num_rows())?;
+
+ Ok(ColumnarValue::Array(zip(&remainder, &else_, &then_value)?))
+ }
+}
+
+impl CaseExpr {
+ /// This function evaluates the form of CASE that matches an expression to
fixed values.
+ ///
+ /// CASE expression
+ /// WHEN value THEN result
+ /// [WHEN ...]
+ /// [ELSE result]
+ /// END
+ fn case_when_with_expr(
+ &self,
+ batch: &RecordBatch,
+ projected: &ProjectedCaseBody,
+ ) -> Result<ColumnarValue> {
+ let return_type = self.data_type(&batch.schema())?;
+ if projected.projection.len() < batch.num_rows() {
Review Comment:
🙏 for spotting this and 🤦♂️
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