branch-4.1: [fix](streaming-job) Isolate schemas for CDC snapshot splits #65645#65820
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### What problem does this PR solve? During snapshot backfill, a snapshot split carried schemas for every captured table. A change record from another table could then be evaluated with the current split key, causing an invalid-field failure when the tables use different primary-key names. This change limits each MySQL and PostgreSQL snapshot split to its own table schema while retaining the reader-level schemas for the global stream split. It also strengthens the multi-table concurrent-DML cases by explicitly enabling snapshot backfill, using different primary-key names, and keeping a source writer active across multiple successful tasks.
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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run buildall |
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run cloud_p0 |
yiguolei
approved these changes
Jul 23, 2026
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Cherry-picked from #65645