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Summary

• fixes: Feature: Fully support UDF expression in DML #18492
• Support UDF expressions in DML mutation expression positions evaluated after mutation input is produced: UPDATE/DELETE filters, MERGE matched and unmatched clause conditions, and MERGE unmatched insert values.
• Rewrite UDF calls inside MERGE unmatched evaluators into derived UDF columns before mutation evaluation.
• Keep MERGE ON UDF expressions out of this PR because they depend on the shared Join UDF rewrite path and should be discussed separately.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Ran locally:

• cargo fmt --all
• git diff --check
• cargo test -p databend-common-sql --test it semantic::binder -- --nocapture
• cargo build --bin=databend-query --bin=databend-meta --bin=databend-sqllogictests
• TEST_HANDLERS=http,hybrid TEST_PARALLEL=1 bash ./scripts/ci/ci-run-sqllogic-tests.sh udf_server
• TEST_HANDLERS=http,hybrid TEST_PARALLEL=1 TEST_EXT_ARGS='--skip_file tpcds_spill_1.test,tpcds_spill_2.test,tpcds_spill_3.test' bash ./scripts/ci/ci-run-sqllogic-tests-native.sh udf_server

Added/updated coverage:

• Binder golden tests for UDF expressions in UPDATE/DELETE filters and MERGE matched/unmatched evaluators.
• UDF server sqllogictest cases for UPDATE, DELETE, and MERGE runtime paths.

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

This change is