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dbms: Server: Fixed the bug in a much nicer way: InterpreterSelectQuery does not split anymore its AST. [#METR-16778]

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This commit is contained in:
Alexey Arno 2015-07-10 21:26:46 +03:00
parent 6efb40c48b
commit 10b695465a
4 changed files with 33 additions and 9 deletions
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3
dbms/include/DB/Parsers/ASTSelectQuery.h
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@ -32,6 +32,8 @@ public:
/// Переписывает select_expression_list, чтобы вернуть только необходимые столбцы в правильном порядке.
void rewriteSelectExpressionList(const Names & column_names);
bool isUnionAllHead() const { return prev_union_all.isNull() && !next_union_all.isNull(); }
ASTPtr clone() const override;
/// Возвращает указатель на формат из последнего SELECT'а цепочки UNION ALL.
@ -55,6 +57,7 @@ public:
ASTPtr limit_offset;
ASTPtr limit_length;
ASTPtr settings;
ASTPtr prev_union_all;
ASTPtr next_union_all; /// Следующий запрос SELECT в цепочке UNION ALL, если такой есть
};

29
dbms/src/Interpreters/InterpreterSelectQuery.cpp
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@ -55,7 +55,6 @@ void InterpreterSelectQuery::init(BlockInputStreamPtr input, const Names & requi
/// Создать цепочку запросов SELECT.
InterpreterSelectQuery * interpreter = this;
ASTPtr tail = query.next_union_all;
query.next_union_all = nullptr;
while (!tail.isNull())
{
@ -63,7 +62,6 @@ void InterpreterSelectQuery::init(BlockInputStreamPtr input, const Names & requi
ASTSelectQuery & head_query = static_cast<ASTSelectQuery &>(*head);
tail = head_query.next_union_all;
head_query.next_union_all = nullptr;
interpreter->next_select_in_union_all.reset(new InterpreterSelectQuery(head, context, to_stage, subquery_depth, nullptr, false));
interpreter = interpreter->next_select_in_union_all.get();
@ -178,7 +176,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(ASTPtr query_ptr_, const Context
size_t subquery_depth_, BlockInputStreamPtr input_, bool is_union_all_head_)
: query_ptr(query_ptr_), query(typeid_cast<ASTSelectQuery &>(*query_ptr)),
context(context_), to_stage(to_stage_), subquery_depth(subquery_depth_),
is_first_select_inside_union_all(is_union_all_head_ && !query.next_union_all.isNull()),
is_first_select_inside_union_all(is_union_all_head_ && query.isUnionAllHead()),
log(&Logger::get("InterpreterSelectQuery"))
{
init(input_);
@ -189,7 +187,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(ASTPtr query_ptr_, const Context
QueryProcessingStage::Enum to_stage_, size_t subquery_depth_, BlockInputStreamPtr input_)
: query_ptr(query_ptr_), query(typeid_cast<ASTSelectQuery &>(*query_ptr)),
context(context_), to_stage(to_stage_), subquery_depth(subquery_depth_),
is_first_select_inside_union_all(!query.next_union_all.isNull()),
is_first_select_inside_union_all(query.isUnionAllHead()),
log(&Logger::get("InterpreterSelectQuery"))
{
init(input_, required_column_names_);
@ -200,7 +198,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(ASTPtr query_ptr_, const Context
const NamesAndTypesList & table_column_names, QueryProcessingStage::Enum to_stage_, size_t subquery_depth_, BlockInputStreamPtr input_)
: query_ptr(query_ptr_), query(typeid_cast<ASTSelectQuery &>(*query_ptr)),
context(context_), to_stage(to_stage_), subquery_depth(subquery_depth_),
is_first_select_inside_union_all(!query.next_union_all.isNull()),
is_first_select_inside_union_all(query.isUnionAllHead()),
log(&Logger::get("InterpreterSelectQuery"))
{
init(input_, required_column_names_, table_column_names);
@ -212,11 +210,13 @@ bool InterpreterSelectQuery::hasAsterisk() const
return true;
if (is_first_select_inside_union_all)
{
for (auto p = next_select_in_union_all.get(); p != nullptr; p = p->next_select_in_union_all.get())
{
if (p->query.hasAsterisk())
return true;
}
}
return false;
}
@ -224,8 +224,10 @@ bool InterpreterSelectQuery::hasAsterisk() const
void InterpreterSelectQuery::renameColumns()
{
if (is_first_select_inside_union_all)
{
for (auto p = next_select_in_union_all.get(); p != nullptr; p = p->next_select_in_union_all.get())
p->query.renameColumns(query);
}
}
void InterpreterSelectQuery::rewriteExpressionList(const Names & required_column_names)
@ -234,17 +236,21 @@ void InterpreterSelectQuery::rewriteExpressionList(const Names & required_column
return;
if (is_first_select_inside_union_all)
{
for (auto p = next_select_in_union_all.get(); p != nullptr; p = p->next_select_in_union_all.get())
{
if (p->query.distinct)
return;
}
}
query.rewriteSelectExpressionList(required_column_names);
if (is_first_select_inside_union_all)
{
for (auto p = next_select_in_union_all.get(); p != nullptr; p = p->next_select_in_union_all.get())
p->query.rewriteSelectExpressionList(required_column_names);
}
}
void InterpreterSelectQuery::getDatabaseAndTableNames(String & database_name, String & table_name)
@ -710,7 +716,18 @@ QueryProcessingStage::Enum InterpreterSelectQuery::executeFetchColumns(BlockInpu
if (max_streams > 1 && !is_remote)
max_streams *= settings.max_streams_to_max_threads_ratio;
streams = storage->read(required_columns, query_ptr,
ASTPtr actual_query_ptr;
if (storage->isRemote())
{
/// В случае удаленного запроса отправляем только SELECT, который выполнится.
actual_query_ptr = query_ptr->clone();
auto actual_select_query = static_cast<ASTSelectQuery *>(&*actual_query_ptr);
actual_select_query->next_union_all = nullptr;
}
else
actual_query_ptr = query_ptr;
streams = storage->read(required_columns, actual_query_ptr,
context, settings_for_storage, from_stage,
settings.max_block_size, max_streams);

4
dbms/src/Parsers/ParserSelectQuery.cpp
View File

@ -329,6 +329,8 @@ bool ParserSelectQuery::parseImpl(Pos & pos, Pos end, ASTPtr & node, Pos & max_p
ParserSelectQuery select_p;
if (!select_p.parse(pos, end, select_query->next_union_all, max_parsed_pos, expected))
return false;
auto next_select_query = static_cast<ASTSelectQuery *>(&*select_query->next_union_all);
next_select_query->prev_union_all = node;
}
else
return false;
@ -367,6 +369,8 @@ bool ParserSelectQuery::parseImpl(Pos & pos, Pos end, ASTPtr & node, Pos & max_p
select_query->children.push_back(select_query->settings);
if (select_query->format)
select_query->children.push_back(select_query->format);
if (select_query->prev_union_all)
select_query->children.push_back(select_query->prev_union_all);
if (select_query->next_union_all)
select_query->children.push_back(select_query->next_union_all);

6
dbms/tests/queries/0_stateless/00098_l_union_all.sql
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@ -1,3 +1,3 @@
SELECT a,b,c,d FROM (SELECT 1 AS a,2 AS b, 3 AS c UNION ALL SELECT 2,3,4 ) ANY inner JOIN (SELECT 1 AS a,2 AS b,4 AS d UNION ALL SELECT 2,3,5) USING (a) ORDER BY a,b,c,d ASC;
SELECT a,b,c,d FROM (SELECT 1 AS a,2 AS b, 3 AS c UNION ALL SELECT 2,3,4 ) ALL left JOIN (SELECT 1 AS a,2 AS b,4 AS d UNION ALL SELECT 2,3,5) USING (a) ORDER BY a,b,c,d ASC;
SELECT a,b,c,d FROM (SELECT 1 AS a,2 AS b, 3 AS c UNION ALL SELECT 2,3,4 ) ALL left JOIN (SELECT 1 AS a,2 AS b,4 AS d UNION ALL SELECT 2,3,5) USING a,b ORDER BY a,b,c,d ASC;
SELECT a,b,c,d FROM (SELECT 1 AS a,2 AS b, 3 AS c UNION ALL SELECT 2,3,4 ) ANY INNER JOIN (SELECT 1 AS a,2 AS b,4 AS d UNION ALL SELECT 2,3,5) USING (a) ORDER BY a,b,c,d ASC;
SELECT a,b,c,d FROM (SELECT 1 AS a,2 AS b, 3 AS c UNION ALL SELECT 2,3,4 ) ALL LEFT JOIN (SELECT 1 AS a,2 AS b,4 AS d UNION ALL SELECT 2,3,5) USING (a) ORDER BY a,b,c,d ASC;
SELECT a,b,c,d FROM (SELECT 1 AS a,2 AS b, 3 AS c UNION ALL SELECT 2,3,4 ) ALL LEFT JOIN (SELECT 1 AS a,2 AS b,4 AS d UNION ALL SELECT 2,3,5) USING a,b ORDER BY a,b,c,d ASC;