yangzhg commented on a change in pull request #3228: Fix output results may
incorrect when using intersect and except statements
URL: https://github.com/apache/incubator-doris/pull/3228#discussion_r400632518
##########
File path: be/src/exec/except_node.cpp
##########
@@ -179,17 +137,21 @@ Status ExceptNode::get_next(RuntimeState* state,
RowBatch* out_batch, bool* eos)
if (reached_limit()) {
return Status::OK();
}
+ int64_t tuple_buf_size;
+ uint8_t* tuple_buf;
+ RETURN_IF_ERROR(
+ out_batch->resize_and_allocate_tuple_buffer(state,
&tuple_buf_size, &tuple_buf));
uint32_t previous_hash = -1;
TupleRow* previous_row = nullptr;
while (_hash_tbl_iterator.has_next()) {
+ VLOG_ROW << "find row: "
+ << get_row_output_string(_hash_tbl_iterator.get_row(),
child(0)->row_desc())
+ << " matched: " << _hash_tbl_iterator.matched();
if (!_hash_tbl_iterator.matched()) {
if (previous_hash != _hash_tbl_iterator.get_hash() ||
!equals(previous_row, _hash_tbl_iterator.get_row())) {
Review comment:
duplicated values will be iterate when get next,and deduplicate can reduce
the cost of probe,you can find detail in hash_table.h,hash table in doris is
not same with the common sense hashtable
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