branch-4.1: [fix](serde) fix split_by_delimiter missing backslash escape handling #61995#64432
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…#61995) ### Bug Stream Load (JSON format) writing to `Map<String, String>` columns silently sets the column to NULL when the map value contains both `\"` (escaped quotes) and `:` or `,`. Stream Load returns Success with FilteredRows=0 — data loss with no error indication. ### Fix Added `\` escape skip in `split_by_delimiter`'s character loop, before quote detection — consistent with the existing escape handling in `deserialize_one_cell_from_json`.
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yiguolei
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Jun 16, 2026
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Cherry-picked from #61995