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// of where conditions (conds). The function returns 0 if the update is handled in the storage engine.
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// Otherwise, an error is returned.
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int ha_tokudb::fast_update(THD *thd, List<Item> &update_fields, List<Item> &update_values, Item *conds) {
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if (tokudb_debug & TOKUDB_DEBUG_UPSERT) {