insert on duplicate未考虑insert into select的情况，这个情况复杂点，可以等insert into select特性支持后，再单独考虑

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The issue only identifies the insert-on-duplicate behavior and the related insert-into-select case; no files, tests, or entry points are provided. First locate the existing insert-on-duplicate implementation and determine how insert-into-select support is handled, then clarify the required behavior and tests before defining done.

Written by the indexing model from the issue text.