jayzhan211 commented on code in PR #10445:
URL: https://github.com/apache/datafusion/pull/10445#discussion_r1597437435
##########
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:
Pull string coercion part out of `string_coercion` as `pure_string_coercion`
```
(Utf8, Utf8) => Some(Utf8),
(LargeUtf8, Utf8) => Some(LargeUtf8),
(Utf8, LargeUtf8) => Some(LargeUtf8),
(LargeUtf8, LargeUtf8) => Some(LargeUtf8),
```
Ideally, values coercion should follow what `union`, `case` does
https://www.postgresql.org/docs/current/typeconv-oper.html
But the actual behavior is expected to follow what postgres or duckdb or
other well-known db does.
I would expect the coercion rule that is included to have the corresponding
test covered.
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