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Addressing review comments

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This commit is contained in:
Igor Nikonov 2022-07-01 22:50:00 +00:00
parent 488ee75fc4
commit 9ef8ff5a31
2 changed files with 7 additions and 5 deletions
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8
src/Processors/QueryPlan/DistinctStep.cpp
View File

@ -82,7 +82,8 @@ DistinctStep::DistinctStep(
void DistinctStep::transformPipeline(QueryPipelineBuilder & pipeline, const BuildQueryPipelineSettings &)
{
if (checkColumnsAlreadyDistinct(columns, input_streams.front().distinct_columns))
const auto & input_stream = input_streams.back();
if (checkColumnsAlreadyDistinct(columns, input_stream.distinct_columns))
return;
if (!pre_distinct)
@ -90,7 +91,6 @@ void DistinctStep::transformPipeline(QueryPipelineBuilder & pipeline, const Buil
if (optimize_distinct_in_order)
{
const auto & input_stream = input_streams.back();
SortDescription distinct_sort_desc = getSortDescription(input_stream.sort_description, columns);
if (!distinct_sort_desc.empty())
{
@ -109,8 +109,10 @@ void DistinctStep::transformPipeline(QueryPipelineBuilder & pipeline, const Buil
return;
}
/// final distinct for sorted stream (sorting inside and among chunks)
if (input_stream.has_single_port)
if (input_stream.sort_mode == DataStream::SortMode::Stream)
{
assert(input_stream.has_single_port);
pipeline.addSimpleTransform(
[&](const Block & header, QueryPipelineBuilder::StreamType stream_type) -> ProcessorPtr
{

4
tests/performance/distinct_in_order.xml
View File

@ -1,7 +1,7 @@
<test>
<!-- high cardinality -->
<create_query>CREATE TABLE distinct_cardinality_high (high UInt64, medium UInt64, low UInt64) ENGINE MergeTree() ORDER BY (high, medium)</create_query>
<fill_query>INSERT INTO distinct_cardinality_high SELECT number % 10000, number % 1000, number % 100 FROM numbers_mt(1e8)</fill_query>
<fill_query>INSERT INTO distinct_cardinality_high SELECT number % 1e6, number % 1e4, number % 1e2 FROM numbers_mt(1e8)</fill_query>
<query>SELECT DISTINCT high FROM distinct_cardinality_high FORMAT Null</query>
<query>SELECT DISTINCT high, low FROM distinct_cardinality_high FORMAT Null</query>
@ -17,7 +17,7 @@
<!-- low cardinality -->
<create_query>CREATE TABLE distinct_cardinality_low (low UInt64, medium UInt64, high UInt64) ENGINE MergeTree() ORDER BY (low, medium)</create_query>
<fill_query>INSERT INTO distinct_cardinality_low SELECT number % 100, number % 1000, number % 10000 FROM numbers_mt(1e8)</fill_query>
<fill_query>INSERT INTO distinct_cardinality_low SELECT number % 1e2, number % 1e4, number % 1e6 FROM numbers_mt(1e8)</fill_query>
<query>SELECT DISTINCT low FROM distinct_cardinality_low FORMAT Null</query>
<query>SELECT DISTINCT low, medium FROM distinct_cardinality_low FORMAT Null</query>