[fix](inverted index) fix check failed for block erase temp column (#20924)

be/src/vec/exec/scan/vscan_node.cpp

@@ -213,6 +213,7 @@ Status VScanNode::get_next(RuntimeState* state, vectorized::Block* block, bool*
     // we built some temporary columns into block, these columns only used in scan node level,
     // remove them when query leave scan node to avoid other nodes use block->columns() to make a wrong decision
     Defer drop_block_temp_column {[&]() {
+        std::unique_lock l(_block_lock);
         auto all_column_names = block->get_names();
         for (auto& name : all_column_names) {
             if (name.rfind(BeConsts::BLOCK_TEMP_COLUMN_PREFIX, 0) == 0) {