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体验新版 GitCode,发现更多精彩内容 >>
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ce2f3fca
编写于
12月 10, 2018
作者:
A
alexey-milovidov
提交者:
GitHub
12月 10, 2018
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差异文件
Merge pull request #3804 from yandex/missing-sql-compatibility-functions
Support SUBSTRING(expr FROM start FOR length)
上级
5cb9f9ea
6a90abc5
变更
4
隐藏空白更改
内联
并排
Showing
4 changed file
with
83 addition
and
1 deletion
+83
-1
dbms/src/Parsers/ExpressionElementParsers.cpp
dbms/src/Parsers/ExpressionElementParsers.cpp
+72
-1
dbms/src/Parsers/ExpressionElementParsers.h
dbms/src/Parsers/ExpressionElementParsers.h
+7
-0
dbms/tests/queries/0_stateless/00765_sql_compatibility_aliases.reference
...ies/0_stateless/00765_sql_compatibility_aliases.reference
+2
-0
dbms/tests/queries/0_stateless/00765_sql_compatibility_aliases.sql
...s/queries/0_stateless/00765_sql_compatibility_aliases.sql
+2
-0
未找到文件。
dbms/src/Parsers/ExpressionElementParsers.cpp
浏览文件 @
ce2f3fca
...
...
@@ -317,6 +317,76 @@ bool ParserCastExpression::parseImpl(Pos & pos, ASTPtr & node, Expected & expect
return
false
;
}
bool
ParserSubstringExpression
::
parseImpl
(
Pos
&
pos
,
ASTPtr
&
node
,
Expected
&
expected
)
{
/// Either SUBSTRING(expr FROM start) or SUBSTRING(expr FROM start FOR length) or SUBSTRING(expr, start, length)
/// The latter will be parsed normally as a function later.
ASTPtr
expr_node
;
ASTPtr
start_node
;
ASTPtr
length_node
;
if
(
!
ParserKeyword
(
"SUBSTRING"
).
ignore
(
pos
,
expected
))
return
false
;
if
(
pos
->
type
!=
TokenType
::
OpeningRoundBracket
)
return
false
;
++
pos
;
if
(
!
ParserExpression
().
parse
(
pos
,
expr_node
,
expected
))
return
false
;
if
(
pos
->
type
!=
TokenType
::
Comma
)
{
if
(
!
ParserKeyword
(
"FROM"
).
ignore
(
pos
,
expected
))
return
false
;
}
else
{
++
pos
;
}
if
(
!
ParserExpression
().
parse
(
pos
,
start_node
,
expected
))
return
false
;
if
(
pos
->
type
==
TokenType
::
ClosingRoundBracket
)
{
++
pos
;
}
else
{
if
(
pos
->
type
!=
TokenType
::
Comma
)
{
if
(
!
ParserKeyword
(
"FOR"
).
ignore
(
pos
,
expected
))
return
false
;
}
else
{
++
pos
;
}
if
(
!
ParserExpression
().
parse
(
pos
,
length_node
,
expected
))
return
false
;
ParserToken
(
TokenType
::
ClosingRoundBracket
).
ignore
(
pos
,
expected
);
}
/// Convert to canonical representation in functional form: SUBSTRING(expr, start, length)
auto
expr_list_args
=
std
::
make_shared
<
ASTExpressionList
>
();
expr_list_args
->
children
=
{
expr_node
,
start_node
};
if
(
length_node
)
expr_list_args
->
children
.
push_back
(
length_node
);
auto
func_node
=
std
::
make_shared
<
ASTFunction
>
();
func_node
->
name
=
"substring"
;
func_node
->
arguments
=
std
::
move
(
expr_list_args
);
func_node
->
children
.
push_back
(
func_node
->
arguments
);
node
=
std
::
move
(
func_node
);
return
true
;
}
bool
ParserExtractExpression
::
parseImpl
(
Pos
&
pos
,
ASTPtr
&
node
,
Expected
&
expected
)
{
...
...
@@ -678,8 +748,9 @@ bool ParserExpressionElement::parseImpl(Pos & pos, ASTPtr & node, Expected & exp
||
ParserArrayOfLiterals
().
parse
(
pos
,
node
,
expected
)
||
ParserArray
().
parse
(
pos
,
node
,
expected
)
||
ParserLiteral
().
parse
(
pos
,
node
,
expected
)
||
ParserExtractExpression
().
parse
(
pos
,
node
,
expected
)
||
ParserCastExpression
().
parse
(
pos
,
node
,
expected
)
||
ParserExtractExpression
().
parse
(
pos
,
node
,
expected
)
||
ParserSubstringExpression
().
parse
(
pos
,
node
,
expected
)
||
ParserCase
().
parse
(
pos
,
node
,
expected
)
||
ParserFunction
().
parse
(
pos
,
node
,
expected
)
||
ParserQualifiedAsterisk
().
parse
(
pos
,
node
,
expected
)
...
...
dbms/src/Parsers/ExpressionElementParsers.h
浏览文件 @
ce2f3fca
...
...
@@ -96,6 +96,13 @@ protected:
bool
parseImpl
(
Pos
&
pos
,
ASTPtr
&
node
,
Expected
&
expected
)
override
;
};
class
ParserSubstringExpression
:
public
IParserBase
{
protected:
const
char
*
getName
()
const
override
{
return
"SUBSTRING expression"
;
}
bool
parseImpl
(
Pos
&
pos
,
ASTPtr
&
node
,
Expected
&
expected
)
override
;
};
class
ParserExtractExpression
:
public
IParserBase
{
protected:
...
...
dbms/tests/queries/0_stateless/00765_sql_compatibility_aliases.reference
浏览文件 @
ce2f3fca
...
...
@@ -8,3 +8,5 @@ fo
oo
o
1
oo
o
dbms/tests/queries/0_stateless/00765_sql_compatibility_aliases.sql
浏览文件 @
ce2f3fca
...
...
@@ -10,3 +10,5 @@ select SUBSTRING('foo', 1, 2);
select
Substr
(
'foo'
,
2
);
select
mid
(
'foo'
,
3
);
select
IF
(
3
>
2
,
1
,
0
);
select
substring
(
'foo'
from
1
+
1
);
select
SUBSTRING
(
'foo'
FROM
2
FOR
1
);
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