ahmedsaid47 opened a new pull request, #61500:
URL: https://github.com/apache/doris/pull/61500
### What problem does this PR solve?
Issue Number: close #48203
Related PR: #48201
Problem Summary:
Add the Trino/Presto `typeof(expr)` scalar function in Nereids.
This implementation is FE-only and rewrites `typeof(...)` to a string
literal during analysis, so it does not require a BE runtime function. The
patch also adds Trino-compatible type display formatting for literals, casts,
arrays, maps, rows, decimals, and nested types.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [x] Unit Test
- [x] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
Manual test steps:
1. `cd fe && mvn package -pl fe-core -am -Dskip.doc=true -DskipTests
-Dcheckstyle.skip=true -T 1`
2. `mvn -pl fe-core -am -Dskip.doc=true -Dcheckstyle.skip=true
-Dtest=org.apache.doris.nereids.trees.expressions.functions.scalar.TypeOfTest
test`
3. Start a local FE runtime and verify `typeof` expressions are rewritten to
the expected varchar literals through FE analysis.
4. Probe the SQLs from
`regression-test/suites/external_table_p0/dialect_compatible/sql/presto/scalar/TestTypeOfFunction.sql`
against FE rewrite output to generate the expected `.out` content.
- Behavior changed:
- [ ] No.
- [x] Yes. Add `typeof(expr) -> varchar`.
- Does this need documentation?
- [x] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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