erratic-pattern commented on code in PR #10323:
URL: https://github.com/apache/datafusion/pull/10323#discussion_r1586797735
##########
datafusion/optimizer/src/unwrap_cast_in_comparison.rs:
##########
@@ -298,19 +306,47 @@ fn is_support_data_type(data_type: &DataType) -> bool {
)
}
+/// Returns true if [UnwrapCastExprRewriter] supports casting this value as a
string
+fn is_supported_string_type(data_type: &DataType) -> bool {
+ matches!(data_type, DataType::Utf8 | DataType::LargeUtf8)
+}
+
+/// Returns true if [UnwrapCastExprRewriter] supports casting this value as a
dictionary
+fn is_supported_dictionary_type(data_type: &DataType) -> bool {
+ matches!(data_type,
+ DataType::Dictionary(_, inner) if is_supported_type(inner))
+}
+
+/// Convert a literal value from one data type to another
fn try_cast_literal_to_type(
lit_value: &ScalarValue,
target_type: &DataType,
-) -> Result<Option<ScalarValue>> {
+) -> Option<ScalarValue> {
let lit_data_type = lit_value.data_type();
- // the rule just support the signed numeric data type now
- if !is_support_data_type(&lit_data_type) ||
!is_support_data_type(target_type) {
- return Ok(None);
+ if !is_supported_type(&lit_data_type) || !is_supported_type(target_type) {
+ return None;
}
if lit_value.is_null() {
// null value can be cast to any type of null value
- return Ok(Some(ScalarValue::try_from(target_type)?));
+ return ScalarValue::try_from(target_type).ok();
Review Comment:
see https://doc.rust-lang.org/std/macro.debug_assert.html
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