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体验新版 GitCode,发现更多精彩内容 >>
提交
02f7cc2d
编写于
2月 21, 2018
作者:
A
Alexey Milovidov
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
Fixed error with StorageMerge [#CLICKHOUSE-2].
上级
222fb2c9
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
3029 addition
and
1 deletion
+3029
-1
dbms/src/Storages/StorageMerge.cpp
dbms/src/Storages/StorageMerge.cpp
+11
-1
dbms/tests/queries/0_stateless/00579_virtual_column_and_lazy.reference
...eries/0_stateless/00579_virtual_column_and_lazy.reference
+3000
-0
dbms/tests/queries/0_stateless/00579_virtual_column_and_lazy.sql
...sts/queries/0_stateless/00579_virtual_column_and_lazy.sql
+18
-0
未找到文件。
dbms/src/Storages/StorageMerge.cpp
浏览文件 @
02f7cc2d
...
...
@@ -192,7 +192,7 @@ BlockInputStreams StorageMerge::read(
if
(
real_column_names
.
size
()
==
0
)
real_column_names
.
push_back
(
ExpressionActions
::
getSmallestColumn
(
table
->
getColumnsList
()));
/// Substitute virtual column for its value
. NOTE This looks terribly wrong
.
/// Substitute virtual column for its value
when querying tables
.
ASTPtr
modified_query_ast
=
query
->
clone
();
VirtualColumnUtils
::
rewriteEntityInAst
(
modified_query_ast
,
"_table"
,
table
->
getTableName
());
...
...
@@ -220,6 +220,12 @@ BlockInputStreams StorageMerge::read(
throw
Exception
(
"Source tables for Merge table are processing data up to different stages"
,
ErrorCodes
::
INCOMPATIBLE_SOURCE_TABLES
);
/// The table may return excessive columns if we query only its virtual column.
/// We filter excessive columns. This is done only if query was not processed more than FetchColumns.
if
(
processed_stage_in_source_table
==
QueryProcessingStage
::
FetchColumns
)
for
(
auto
&
stream
:
source_streams
)
stream
=
std
::
make_shared
<
FilterColumnsBlockInputStream
>
(
stream
,
real_column_names
,
true
);
/// Subordinary tables could have different but convertible types, like numeric types of different width.
/// We must return streams with structure equals to structure of Merge table.
for
(
auto
&
stream
:
source_streams
)
...
...
@@ -249,6 +255,10 @@ BlockInputStreams StorageMerge::read(
throw
Exception
(
"Source tables for Merge table are processing data up to different stages"
,
ErrorCodes
::
INCOMPATIBLE_SOURCE_TABLES
);
if
(
processed_stage_in_source_table
==
QueryProcessingStage
::
FetchColumns
)
for
(
auto
&
stream
:
streams
)
stream
=
std
::
make_shared
<
FilterColumnsBlockInputStream
>
(
stream
,
real_column_names
,
true
);
auto
stream
=
streams
.
empty
()
?
std
::
make_shared
<
NullBlockInputStream
>
(
header
)
:
streams
.
front
();
if
(
!
streams
.
empty
())
{
...
...
dbms/tests/queries/0_stateless/00579_virtual_column_and_lazy.reference
0 → 100644
浏览文件 @
02f7cc2d
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dbms/tests/queries/0_stateless/00579_virtual_column_and_lazy.sql
0 → 100644
浏览文件 @
02f7cc2d
DROP
TABLE
IF
EXISTS
test
.
sample1
;
DROP
TABLE
IF
EXISTS
test
.
sample2
;
DROP
TABLE
IF
EXISTS
test
.
sample_merge
;
CREATE
TABLE
test
.
sample1
(
x
UInt64
,
d
Date
DEFAULT
today
())
ENGINE
=
MergeTree
(
d
,
intHash64
(
x
),
intHash64
(
x
),
10
);
CREATE
TABLE
test
.
sample2
(
x
UInt64
,
d
Date
DEFAULT
today
())
ENGINE
=
MergeTree
(
d
,
intHash64
(
x
),
intHash64
(
x
),
10
);
INSERT
INTO
test
.
sample1
(
x
)
SELECT
number
AS
x
FROM
system
.
numbers
LIMIT
1000
;
INSERT
INTO
test
.
sample2
(
x
)
SELECT
number
AS
x
FROM
system
.
numbers
LIMIT
2000
;
CREATE
TABLE
test
.
sample_merge
AS
test
.
sample1
ENGINE
=
Merge
(
test
,
'^sample
\\
d$'
);
SET
max_threads
=
1
;
SELECT
_sample_factor
FROM
merge
(
test
,
'^sample
\\
d$'
);
DROP
TABLE
test
.
sample1
;
DROP
TABLE
test
.
sample2
;
DROP
TABLE
test
.
sample_merge
;
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