morrySnow opened a new pull request, #64881:
URL: https://github.com/apache/doris/pull/64881
### What problem does this PR solve?
Issue Number: N/A
Related PR: N/A
Problem Summary: FE constant folding produced results different from BE
execution for several string, URL, time, and floating-point expressions. The
root causes were mixed UTF-16 and SQL character positions, Java Unicode and URI
semantics differing from BE ICU/raw parser behavior, UTF-16 string ordering
instead of UTF-8 byte comparison, microsecond rounding carry being dropped in
maketime, concat_ws null handling differences, and boxed floating comparisons
distinguishing -0.0 from 0.0. This PR aligns those FE executable folding paths
with BE behavior and adds testFoldConst coverage for the mismatched expressions.
### Release note
None
### Check List (For Author)
- Test: Unit Test
- mvn checkstyle:check -pl fe-core
- mvn -pl fe-core -am -DskipTests compile
- Behavior changed: No
- Does this need documentation: No
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