Cherry pick #97213 to 26.1: Fix FunctionVariantAdaptor exception when nested function returns Nothing type#97259
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robot-clickhouse merged 4 commits intobackport/26.1/97213from Feb 18, 2026
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…hing type When `FunctionVariantAdaptor` executes a function on a Variant column that contains a single variant (e.g., `Array(Nothing)` from an empty array literal `[]`), the nested function can return a result of type `Nothing`. The code only checked for `Nullable(Nothing)` via `onlyNull` but missed plain `Nothing`, causing a failed cast to the expected `Variant(...)` result type and a `LOGICAL_ERROR` exception. Add `isNothing` checks alongside existing `onlyNull` checks in all three execution paths (single variant no NULLs, single variant with NULLs, multiple variants) to treat `Nothing` results as defaults/NULLs. https://s3.amazonaws.com/clickhouse-test-reports/json.html?REF=master&sha=42be5daa2cfd617b45ee36eeec6d72fd405fba41&name_0=MasterCI&name_1=AST%20fuzzer%20%28amd_debug%29 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…ot support Variant type inference in UNION ALL Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…-type Fix FunctionVariantAdaptor exception when nested function returns Nothing type
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Original pull-request #97213
Do not merge this PR manually
This pull-request is a first step of an automated backporting.
It contains changes similar to calling
git cherry-picklocally.If you intend to continue backporting the changes, then resolve all conflicts if any.
Otherwise, if you do not want to backport them, then just close this pull-request.
The check results does not matter at this step - you can safely ignore them.
Troubleshooting
If the conflicts were resolved in a wrong way
If this cherry-pick PR is completely screwed by a wrong conflicts resolution, and you want to recreate it:
pr-cherrypicklabel from the PRYou also need to check the Original pull-request for
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The PR is created in the CI job