branch-4.1: [fix](scan) Avoid misleading "storage reader" wrapper for data/expression errors #64755#64840
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…sion errors (#64755) ## Proposed changes ### Problem When an `INSERT`/`CTAS` (or any query) hits a data-conversion error during scan — e.g. a strict `CAST(... AS BIGINT)` on an empty string produced by `regexp_extract`, which returns `INVALID_ARGUMENT parse number fail, string: ''` — the user-facing error reads: ``` [INVALID_ARGUMENT]parse number fail, string: ''failed to initialize storage reader. tablet=421411554, backend=10.228.1.18 ``` The `failed to initialize storage reader. tablet=...` suffix makes it look like the tablet/segment is corrupted or missing, when the real cause is a data/expression error. ### Root cause `OlapScanner::_open_impl` appended `failed to initialize storage reader. tablet=...` to **any** non-OK status returned by `TabletReader::init()`. But `init()` does not merely set up objects — the merge reader eagerly reads the first block of each rowset (`BlockReader::_init_collect_iter` → `VCollectIterator::build_heap` → `Level0Iterator::refresh_current_row` → `RowsetReader::next_batch`) to seed the merge heap. Pushed-down expressions (`common_expr_ctxs`) are evaluated during that first-block read, so a strict-cast failure surfaces inside `init()` and gets wrapped with the storage-reader message. ### Fix Branch on the error code: only genuine storage-level failures keep the `failed to initialize storage reader` wording. For `INVALID_ARGUMENT` (data/expression errors) the message stays neutral and explicitly notes it is a data/expression error rather than a storage failure, while still reporting tablet/backend for locating the node. This is purely a message/diagnostics change; control flow and the returned error code are unchanged. The underlying strict-cast semantics issue is tracked separately (see #64266). ## Further comments No behavior change other than the error text; no new tests added.
yiguolei
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Jun 25, 2026
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Cherry-picked from #64755