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体验新版 GitCode,发现更多精彩内容 >>
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af7e4a0c
编写于
8月 12, 2016
作者:
A
Alexey Milovidov
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电子邮件补丁
差异文件
Try to improve performance of ColumnString::insertInto [#METR-22173].
上级
d141a916
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
49 addition
and
20 deletion
+49
-20
dbms/include/DB/Columns/ColumnString.h
dbms/include/DB/Columns/ColumnString.h
+49
-20
未找到文件。
dbms/include/DB/Columns/ColumnString.h
浏览文件 @
af7e4a0c
...
...
@@ -86,43 +86,71 @@ public:
void
insert
(
const
Field
&
x
)
override
{
const
String
&
s
=
DB
::
get
<
const
String
&>
(
x
);
size_t
old_size
=
chars
.
size
();
size_t
size_to_append
=
s
.
size
()
+
1
;
const
size_t
old_size
=
chars
.
size
();
const
size_t
size_to_append
=
s
.
size
()
+
1
;
const
size_t
new_size
=
old_size
+
size_to_append
;
chars
.
resize
(
old_size
+
size_to_append
);
chars
.
resize
(
new_size
);
memcpy
(
&
chars
[
old_size
],
s
.
c_str
(),
size_to_append
);
offsets
.
push_back
(
(
offsets
.
size
()
==
0
?
0
:
offsets
.
back
())
+
size_to_append
);
offsets
.
push_back
(
new_size
);
}
void
insertFrom
(
const
IColumn
&
src_
,
size_t
n
)
override
{
const
ColumnString
&
src
=
static_cast
<
const
ColumnString
&>
(
src_
);
size_t
old_size
=
chars
.
size
();
size_t
size_to_append
=
src
.
sizeAt
(
n
);
size_t
offset
=
src
.
offsetAt
(
n
);
chars
.
resize
(
old_size
+
size_to_append
);
memcpySmallAllowReadWriteOverflow15
(
&
chars
[
old_size
],
&
src
.
chars
[
offset
],
size_to_append
);
offsets
.
push_back
((
offsets
.
size
()
==
0
?
0
:
offsets
.
back
())
+
size_to_append
);
if
(
n
!=
0
)
{
const
size_t
size_to_append
=
src
.
offsets
[
n
]
-
src
.
offsets
[
n
-
1
];
if
(
size_to_append
==
1
)
{
/// shortcut for empty string
chars
.
push_back
(
0
);
offsets
.
push_back
(
chars
.
size
());
}
else
{
const
size_t
old_size
=
chars
.
size
();
const
size_t
offset
=
src
.
offsets
[
n
-
1
];
const
size_t
new_size
=
old_size
+
size_to_append
;
chars
.
resize
(
new_size
);
memcpySmallAllowReadWriteOverflow15
(
&
chars
[
old_size
],
&
src
.
chars
[
offset
],
size_to_append
);
offsets
.
push_back
(
new_size
);
}
}
else
{
const
size_t
old_size
=
chars
.
size
();
const
size_t
size_to_append
=
src
.
offsets
[
0
];
const
size_t
new_size
=
old_size
+
size_to_append
;
chars
.
resize
(
new_size
);
memcpySmallAllowReadWriteOverflow15
(
&
chars
[
old_size
],
&
src
.
chars
[
0
],
size_to_append
);
offsets
.
push_back
(
new_size
);
}
}
void
insertData
(
const
char
*
pos
,
size_t
length
)
override
{
size_t
old_size
=
chars
.
size
();
const
size_t
old_size
=
chars
.
size
();
const
size_t
new_size
=
old_size
+
length
+
1
;
chars
.
resize
(
old_size
+
length
+
1
);
chars
.
resize
(
new_size
);
memcpy
(
&
chars
[
old_size
],
pos
,
length
);
chars
[
old_size
+
length
]
=
0
;
offsets
.
push_back
(
(
offsets
.
size
()
==
0
?
0
:
offsets
.
back
())
+
length
+
1
);
offsets
.
push_back
(
new_size
);
}
void
insertDataWithTerminatingZero
(
const
char
*
pos
,
size_t
length
)
override
{
size_t
old_size
=
chars
.
size
();
const
size_t
old_size
=
chars
.
size
();
const
size_t
new_size
=
old_size
+
length
;
chars
.
resize
(
old_size
+
length
);
chars
.
resize
(
new_size
);
memcpy
(
&
chars
[
old_size
],
pos
,
length
);
offsets
.
push_back
(
(
offsets
.
size
()
==
0
?
0
:
offsets
.
back
())
+
length
);
offsets
.
push_back
(
new_size
);
}
void
popBack
(
size_t
n
)
override
...
...
@@ -149,14 +177,15 @@ public:
const
char
*
deserializeAndInsertFromArena
(
const
char
*
pos
)
override
{
size_t
string_size
=
*
reinterpret_cast
<
const
size_t
*>
(
pos
);
const
size_t
string_size
=
*
reinterpret_cast
<
const
size_t
*>
(
pos
);
pos
+=
sizeof
(
string_size
);
size_t
old_size
=
chars
.
size
();
chars
.
resize
(
old_size
+
string_size
);
const
size_t
old_size
=
chars
.
size
();
const
size_t
new_size
=
old_size
+
string_size
;
chars
.
resize
(
new_size
);
memcpy
(
&
chars
[
old_size
],
pos
,
string_size
);
offsets
.
push_back
(
(
offsets
.
size
()
==
0
?
0
:
offsets
.
back
())
+
string
_size
);
offsets
.
push_back
(
new
_size
);
return
pos
+
string_size
;
}
...
...
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