Fix ARRAY_JOIN row count mismatch in partial evaluation during outer-to-inner join optimization

[alexey-milovidov]

Summary

• Fix LOGICAL_ERROR exception when arrayJoin in a WHERE clause causes row count mismatch during partial evaluation in the convertOuterJoinToInnerJoin optimization
• arrayJoin expands a single-row constant array into multiple rows, breaking the invariant that all columns have input_rows_count rows
• Skip ARRAY_JOIN expansion during partial evaluation (input_rows_count > 0), propagating "unknown" instead — the header evaluation path (input_rows_count=0) is unaffected
• This is distinct from the null-column segfault fixed in Fix segfault in outer-to-inner join optimization with arrayJoin in filter #98147 — here the input column IS present but expanding it breaks the row count invariant

CI report: https://s3.amazonaws.com/clickhouse-test-reports/json.html?REF=master&sha=a1e0dff89e0b4aa8c21455db0bda2ca751f3387e&name_0=MasterCI&name_1=AST%20fuzzer%20%28amd_ubsan%29

Test plan

• Added stateless test 03836_array_join_in_filter_partial_evaluation reproducing the exception
• Verified original fuzzer query no longer triggers exception

Changelog category (leave one):

• Critical Bug Fix (crash, data loss, RBAC)

Changelog entry (a user-readable short description of the changes that goes into CHANGELOG.md):

Fix LOGICAL_ERROR exception when arrayJoin is used in a filter expression with OUTER JOIN and join_use_nulls enabled.

🤖 Generated with Claude Code

[clickhouse-gh]

Workflow [PR], commit [0a7dff1]

Summary: ✅