mingmwang commented on code in PR #6102:
URL: https://github.com/apache/arrow-datafusion/pull/6102#discussion_r1174890770
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datafusion/optimizer/src/analyzer/type_coercion.rs:
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@@ -312,49 +313,39 @@ impl TreeNodeRewriter for TypeCoercionRewriter {
}) => {
let expr_type = expr.get_type(&self.schema)?;
let low_type = low.get_type(&self.schema)?;
- let low_coerced_type = comparison_coercion(&expr_type,
&low_type)
- .ok_or_else(|| {
- DataFusionError::Internal(format!(
- "Failed to coerce types {expr_type} and {low_type}
in BETWEEN expression"
- ))
- })?;
let high_type = high.get_type(&self.schema)?;
- let high_coerced_type = comparison_coercion(&expr_type,
&low_type)
- .ok_or_else(|| {
- DataFusionError::Internal(format!(
- "Failed to coerce types {expr_type} and
{high_type} in BETWEEN expression"
- ))
- })?;
- let coercion_type =
- comparison_coercion(&low_coerced_type, &high_coerced_type)
- .ok_or_else(|| {
- DataFusionError::Internal(format!(
- "Failed to coerce types {expr_type} and
{high_type} in BETWEEN expression"
- ))
- })?;
- let expr = Expr::Between(Between::new(
- Box::new(expr.cast_to(&coercion_type, &self.schema)?),
- negated,
- Box::new(low.cast_to(&coercion_type, &self.schema)?),
- Box::new(high.cast_to(&coercion_type, &self.schema)?),
- ));
- Ok(expr)
+ let between_common_type = comparison_coercion(&low_type,
&high_type).ok_or(DataFusionError::Internal(format!("Failed to coerce types
{low_type} and {high_type} in BETWEEN expression")))?;
+ // Because low/high is Literal, cast them as much as possible
to avoid cast expr.
Review Comment:
Why the high and low are always `Literal`?
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