liukun4515 commented on a change in pull request #1408:
URL: https://github.com/apache/arrow-datafusion/pull/1408#discussion_r769196093
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File path: datafusion/src/physical_plan/expressions/average.rs
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@@ -220,6 +243,74 @@ mod tests {
use arrow::record_batch::RecordBatch;
use arrow::{array::*, datatypes::*};
+ #[test]
+ fn test_avg_return_data_type() -> Result<()> {
+ let data_type = DataType::Decimal(10, 5);
+ let result_type = avg_return_type(&data_type)?;
+ assert_eq!(DataType::Decimal(14, 9), result_type);
+
+ let data_type = DataType::Decimal(36, 10);
+ let result_type = avg_return_type(&data_type)?;
+ assert_eq!(DataType::Decimal(38, 14), result_type);
+ Ok(())
+ }
+
+ #[test]
+ fn avg_decimal() -> Result<()> {
+ // test agg
+ let mut decimal_builder = DecimalBuilder::new(6, 10, 0);
+ for i in 1..7 {
+ // the avg is 3.5, but we get the result of 3
Review comment:
This comment is out of data, I will remove this.
Sorry for that which make you confused.
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