yiguolei commented on code in PR #26127:
URL: https://github.com/apache/doris/pull/26127#discussion_r1376955076


##########
be/src/vec/exprs/vexpr_context.cpp:
##########
@@ -288,14 +288,21 @@ Status 
VExprContext::execute_conjuncts_and_filter_block(const VExprContextSPtrs&
 }
 
 Status VExprContext::get_output_block_after_execute_exprs(
-        const VExprContextSPtrs& output_vexpr_ctxs, const Block& input_block, 
Block* output_block) {
+        const VExprContextSPtrs& output_vexpr_ctxs, const Block& input_block, 
Block* output_block,
+        bool do_projection) {
+    auto rows = input_block.rows();
     vectorized::Block tmp_block(input_block.get_columns_with_type_and_name());
     vectorized::ColumnsWithTypeAndName result_columns;
     for (auto& vexpr_ctx : output_vexpr_ctxs) {
         int result_column_id = -1;
         RETURN_IF_ERROR(vexpr_ctx->execute(&tmp_block, &result_column_id));
         DCHECK(result_column_id != -1);
-        
result_columns.emplace_back(tmp_block.get_by_position(result_column_id));
+        const auto& col = tmp_block.get_by_position(result_column_id);
+        if (do_projection) {

Review Comment:
   may have performance issues



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