jayzhan211 commented on code in PR #10445: URL: https://github.com/apache/datafusion/pull/10445#discussion_r1597438771
########## datafusion/expr/src/logical_plan/builder.rs: ########## @@ -188,37 +181,61 @@ impl LogicalPlanBuilder { n_cols ); } - field_types = row - .iter() - .enumerate() - .map(|(j, expr)| { - if let Expr::Literal(ScalarValue::Null) = expr { - nulls.push((i, j)); - Ok(field_types[j].clone()) - } else { - let data_type = expr.get_type(&empty_schema)?; - if let Some(prev_data_type) = &field_types[j] { - if prev_data_type != &data_type { - return plan_err!("Inconsistent data type across values list at row {i} column {j}. Was {prev_data_type} but found {data_type}") + } + + let empty_schema = DFSchema::empty(); + let mut field_types: Vec<DataType> = Vec::with_capacity(n_cols); + for j in 0..n_cols { + let mut common_type: Option<DataType> = None; + for (i, row) in values.iter().enumerate() { + let value = &row[j]; + if let Expr::Literal(ScalarValue::Null) = value { + continue; + } else { + let data_type = value.get_type(&empty_schema)?; + if let Some(prev_type) = common_type { + // get common type of each row values. + match comparison_coercion(&data_type, &prev_type) { Review Comment: I had once tried to introduce type resolution coercion in https://github.com/apache/datafusion/pull/10268, but not yet merged. I would recommend we start with simple coercion rule first. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org