caiconghui commented on code in PR #27943:
URL: https://github.com/apache/doris/pull/27943#discussion_r1415290569


##########
be/src/vec/exec/scan/scanner_scheduler.cpp:
##########
@@ -384,10 +384,15 @@ void ScannerScheduler::_scanner_scan(ScannerScheduler* 
scheduler, ScannerContext
             ctx->return_free_block(std::move(block));
         } else {
             if (!blocks.empty() && blocks.back()->rows() + block->rows() <= 
state->batch_size()) {
-                status = 
vectorized::MutableBlock(blocks.back().get()).merge(*block);
+                auto rows = blocks.back()->rows() + block->rows();
+                vectorized::MutableBlock mutable_block(blocks.back().get());
+                status = mutable_block.merge(*block);
                 if (!status.ok()) {
                     break;
                 }
+                if (!blocks.back().get()->is_valid(rows)) {

Review Comment:
   the key point is that we reassign value to block from mutable block, and 
where to do check i think are both ok



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