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605 Commits

Author SHA1 Message Date
Evgenii Pravda
bc4eb309e2 Trying to defeat gcc 8 (2) 2019-04-20 02:04:17 +03:00
Evgenii Pravda
6157ddba0d Trying to defeat gcc 8 2019-04-20 02:04:17 +03:00
Evgenii Pravda
fecf0a3630 Some fixes 2019-04-20 02:04:17 +03:00
Evgenii Pravda
f1e842cdf6 Use radixSort when possible 2019-04-20 02:04:17 +03:00
Alexey Milovidov
ee1a843609 COWPtr: improvements (C++ Russia 2019, suggested by Alexey Malov) 2019-04-19 23:22:06 +03:00
alesapin
faeb95cfd7
Merge branch 'master' into adaptive_index_granularity 2019-04-15 19:36:36 +03:00
Alexander Kozhikhov
19021e76bb style 2019-04-15 03:16:13 +03:00
Alexey Milovidov
b4878dbffa Added support for non-constant and negative size and length arguments for function substringUTF8 2019-04-12 03:34:11 +03:00
Alexander Kozhikhov
c93aae6741 linear regression 2019-04-09 01:40:37 +03:00
Alexander Kozhikhov
f550304fa4 Merge branch 'master' of https://github.com/yandex/ClickHouse 2019-04-04 03:17:37 +03:00
alesapin
7b67200258 Merge remote-tracking branch 'origin' into adaptive_index_granularity 2019-04-01 11:54:19 +03:00
alexey-milovidov
254369324b
Miscellanous changes in ColumnArray (#4857) 
* Miscellanous

* Miscellanous

* Miscellanous
 2019-03-30 13:46:17 +03:00
Alexey Milovidov
61832964e1 Revert "ColumnFunction: better code (incomplete)" 
This reverts commit 327f527d33.
 2019-03-29 19:42:26 +03:00
Alexey Milovidov
5dddee50eb Merge branch 'master' of github.com:yandex/ClickHouse 2019-03-29 19:41:59 +03:00
alexey-milovidov
296731dd85
Merge pull request #4850 from yandex/fix-reading-from-empty-low-cardinality-arrays 
Fixed reading from Array(LowCardinality) with long block of empty arrays.
 2019-03-29 19:38:32 +03:00
Alexey Milovidov
ff0c269847 Merge branch 'master' of github.com:yandex/ClickHouse 2019-03-29 18:35:58 +03:00
Alexey Milovidov
327f527d33 ColumnFunction: better code (incomplete) 2019-03-29 18:35:53 +03:00
alexey-milovidov
de07b70178
Merge pull request #4849 from yandex/remove-unsafe-method-column-function 
Removed unsafe methods from ColumnFunction
 2019-03-29 18:23:33 +03:00
Nikolai Kochetov
5bd46508e8 Fix comments. 2019-03-29 18:07:53 +03:00
Alexey Milovidov
f86abeb8df Fixed comments 2019-03-29 18:06:35 +03:00
Nikolai Kochetov
53319e2d6e Fixed reading from Array(LowCardinality) column with long block of empty array. 2019-03-29 17:06:46 +03:00
Alexey Milovidov
fdb0747219 Removed unsafe methods from ColumnFunction 2019-03-29 16:46:36 +03:00
Alexey Milovidov
67b6a8966b Attempt to make compositions with COWPtr more convenient 2019-03-25 20:56:18 +03:00
Alexey Milovidov
fb19cf1eec Attempt to make compositions with COWPtr more convenient 2019-03-25 04:43:54 +03:00
Alexey Milovidov
c76a4e9dd2 Attempt to make compositions with COWPtr more convenient 2019-03-24 05:21:01 +03:00
Alexey Milovidov
2dca389f20 Attempt to make compositions with COWPtr more convenient 2019-03-24 04:42:58 +03:00
alesapin
ce03636f05 Merge master 2019-03-18 15:02:33 +03:00
alexey-milovidov
40944ca356
Merge pull request #4698 from yandex/fixed-insufficient-type-check-in-has-all-any-function 
Fixed insufficient type checking in hasAll, hasAny functions
 2019-03-15 04:55:26 +03:00
Alexey Milovidov
a459b2c298 Fixed insufficient type checking in hasAll, hasAny functions 2019-03-15 02:10:51 +03:00
proller
8c70de3bc7
Build fixes (freebsd) (#4696) 2019-03-14 23:52:10 +03:00
Alexey Milovidov
d95cd4a362 Removed obsolete code after #3920 2019-03-11 01:01:12 +03:00
alexey-milovidov
6db73152d2
Hardening debug build (experimental) (#4632) 
* Hardening debug build: more granular memory mappings and ASLR; add memory protection for mark cache and index

* Addition to prev. revision

* Addition to prev. revision

* Addition to prev. revision
 2019-03-10 06:16:51 +03:00
Alexey Milovidov
4905cd2b0a Added missing include 2019-03-08 15:59:06 +03:00
Alexey Milovidov
9d89cc0fc1 Debugging PODArray 2019-03-08 06:23:02 +03:00
Alexey Milovidov
c3fabfb93f Improvement #4564 2019-03-04 03:03:20 +03:00
Alexey Milovidov
315b6f3878 Better string comparison (development) 2019-03-03 23:08:39 +03:00
Amos Bird
26ab5dd7a7 A Proper lookup table that uses HashTable's API 
This is the first step of allowing heterogeneous cells in hash tables.

performance test results are

```

1. HashMap<UInt16, UInt8, TrivialHash, HashTableFixedGrower<16>>;
2. NewLookupMap<UInt16, UInt8>

ResolutionWidth 30000 1 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................223550276.46
ResolutionWidth 30000 2 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................248772721.24
Best: 2 - 24877272124

ResolutionWidth 100000 1 ..........................................................................................................................................................................................................................................................238498413.99
ResolutionWidth 100000 2 ..........................................................................................................................................................................................................................................................261808889.98
Best: 2 - 26180888998

ResolutionWidth 300000 1 ...................................................................................239307348.81
ResolutionWidth 300000 2 ...................................................................................257592761.30
Best: 2 - 25759276130

ResolutionWidth 1000000 1 .........................240144759.26
ResolutionWidth 1000000 2 .........................257093531.91
Best: 2 - 25709353191

ResolutionWidth 5000000 1 .....241573260.35
ResolutionWidth 5000000 2 .....259314162.79
Best: 2 - 25931416279

ResolutionDepth 30000 1 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................217108119.84
ResolutionDepth 30000 2 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................249459504.41
Best: 2 - 24945950441

ResolutionDepth 100000 1 ..........................................................................................................................................................................................................................................................229065162.17
ResolutionDepth 100000 2 ..........................................................................................................................................................................................................................................................253769105.64
Best: 2 - 25376910564

ResolutionDepth 300000 1 ...................................................................................233079225.18
ResolutionDepth 300000 2 ...................................................................................256316273.78
Best: 2 - 25631627378

ResolutionDepth 1000000 1 .........................234184633.51
ResolutionDepth 1000000 2 .........................261100491.57
Best: 2 - 26110049157

ResolutionDepth 5000000 1 .....233118795.66
ResolutionDepth 5000000 2 .....252436160.41
Best: 2 - 25243616041

```
 2019-03-01 16:47:13 +08:00
proller
aad2856eba CLICKHOUSE-4179 : arrayEnumerateDenseRanked arrayEnumerateUniqRanked (#4475) 
* Build fixes (clang 7.0.0+)

* better

* wip

* wip

* fix

* fix

* wip

* fix

* clean

* clean

* CLICKHOUSE-4179 WIP

* wip

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* wip

* wip

*    wip

* wip

* wip

* wip

* wip

* cf

*    wip

* wip

* wip

* wip

* cf

* wip

* wip# Please enter the commit message for your changes. Lines starting

* wip# Please enter the commit message for your changes. Lines starting

* cf

* wip# Please enter the commit message for your changes. Lines starting

* wip

* cf

* wip

* wip

* clean

* clean

* clean

* clean

* wip

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* cf

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* clean

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* test

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* cf

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* clean

* cf

* clean

* Requested changes

* cf

* no convertToFullColumnIfConst

* clean

* clean

* clean

* fix

* Remove comment
 2019-02-28 01:18:58 +03:00
Vitaly Baranov
4b6cba9a8e IColumn::getPermutation() and IColumn::permutate() functions, "limit" parameter: change type UInt64 -> size_t. 2019-02-19 14:56:09 +03:00
Vitaly Baranov
833aa9189b IColumn::index() function, "limit" parameter: change type UInt64 -> size_t. 2019-02-19 14:47:41 +03:00
Vitaly Baranov
ab7e7507a4 Revert incorrect fix compilation on Mac. 
This reverts commit ef6b20030c.
 2019-02-18 20:31:18 +03:00
alexander kozhikhov
b23cd21ce1 predict correctly using scalar aggr state 2019-02-13 01:33:37 +03:00
alexander kozhikhov
aedf4925dc Merge branch 'master' into ml_methods 2019-02-12 23:04:25 +03:00
alexander kozhikhov
f20ad204e7 Merge branch 'master' of https://github.com/yandex/ClickHouse 2019-02-12 23:00:47 +03:00
alexey-milovidov
62f097eb66
Merge pull request #4348 from yandex/aggregate-function-state-in-field 
Aggregate function state in field
 2019-02-12 22:13:38 +03:00
Vitaly Baranov
ef6b20030c Fix compilation on Mac. 2019-02-12 14:15:03 +03:00
Nikolai Kochetov
a4441bfba2 Fix tests. 2019-02-12 13:09:03 +03:00
Nikolai Kochetov
c35439a5f0 Updated FieldVisitor. 2019-02-11 18:46:19 +03:00
Nikolai Kochetov
85318c0bfd Merge branch 'master' into aggregate-function-state-in-field 2019-02-11 15:41:11 +03:00
Nikolai Kochetov
9787b3a1ee Added Field type AggregateFunctionState. 2019-02-11 14:19:56 +03:00
alexander kozhikhov
fc4c721fa5 some review fixes 2019-02-11 01:07:47 +03:00
alexander kozhikhov
a948f223bc Merge branch 'master' of https://github.com/Quid37/ClickHouse 2019-02-11 00:17:14 +03:00
alexander kozhikhov
bfccafef49 small test code 2019-02-11 00:16:16 +03:00
alexey-milovidov
0dd618b9ad
Merge pull request #4326 from yandex/duplicate-includes 
Removed duplicate includes
 2019-02-10 22:31:37 +03:00
Alexey Milovidov
e150e62040 Grouped includes (40 of 182) 2019-02-10 20:40:52 +03:00
Alexey Milovidov
ba3cb83a84 Removed duplicate includes 2019-02-10 20:12:22 +03:00
Alexey Milovidov
4799a343ee Addition to prev. revision #4246 2019-02-10 19:22:38 +03:00
Alexey Milovidov
c603d270f4 Cleanups #4246 2019-02-10 18:17:45 +03:00
alexander kozhikhov
7cea77b8c0 Merge branch 'master' of https://github.com/Quid37/ClickHouse into ml_methods 2019-02-10 00:19:08 +03:00
alexander kozhikhov
be17c6fab6 Merge branch 'master' of https://github.com/yandex/ClickHouse 2019-02-10 00:10:33 +03:00
Vasily Nemkov
2716df8ab2 IPv4 and IPv6 Domain implementation. 
Added:
 * IDataTypeDomain interface;
 * method DataTypeFactory::registerDataTypeDomain for registering domains;
 * DataTypeDomainWithSimpleSerialization domain base class with simple serialization/deserialization;
 * Concrete IPv4 and IPv6 domain implementations: DataTypeDomanIPv6 and DataTypeDomanIPv4;

Updated:
 * IDataType text serialization/deserialization methods;
 * IDataType implementation to use domain for text serialization/deserialization;
 * Refactored implementation of the IPv4/IPv6 functions to use formatIPv4/v6 and parseIPv4/v6 from Common/formatIPv6.h;

Tests:
 * Added test cases for IPv4 and IPv6 domains.
 * Updated IPv4/v6 functions tests to validate more cases;
 * Added performance tests for IPv4 and IPv6 related functions;
 2019-02-04 12:37:46 +03:00
Evgenii Pravda
67d26f6528 Use pdqsort instead of std::sort in ORDER BY 2019-02-02 16:52:20 +03:00
Masha
39f1d9756e fixed name Logistic 2019-01-28 11:54:55 +00:00
Masha
286fa25ad9 logreg and momentum 2019-01-28 10:39:57 +00:00
alexander kozhikhov
57cd47a194 LinearModelData completed 2019-01-26 15:38:42 +03:00
proller
5328251ff1
Fix build without protobuf, gtest, cppkafka (#4152) 2019-01-25 23:02:03 +03:00
alexander kozhikhov
b229498203 mini-batches 2019-01-23 21:03:26 +03:00
alexander kozhikhov
fd8f9c4fba changes after review 2019-01-23 04:29:53 +03:00
alexander kozhikhov
19ca2f3af8 linear regression 2019-01-23 01:18:07 +03:00
alexander kozhikhov
ffd0d9af26 Merge branch 'alexkoja_ML' 2019-01-23 00:31:53 +03:00
alexander kozhikhov
61bb3b8ade simple linear regression 2019-01-23 00:07:05 +03:00
maiha
6c83beafdd dbms: Fixed misspells in comments 2019-01-23 04:56:53 +09:00
alexey-milovidov
ca7c3c0bfd
Merge pull request #4012 from yandex/fix-low-cardinality-numeric-distinct 
Distinct by single LowCardinality numeric column.
 2019-01-09 19:28:42 +03:00
Nikolai Kochetov
5ab362a303 Fix distinct by single LowCardinality numeric column. 2019-01-09 17:47:51 +03:00
Alexey Milovidov
3874dc5ac3 Fixed error in #3920 2019-01-08 17:56:07 +03:00
Alexey Milovidov
0dfa553fca Added more warnings from clang's -Weverything, that are available in clang 8 2019-01-07 13:40:58 +03:00
Alexey Milovidov
cf1cacc366 Added some warnings from clang's -Weverything 2019-01-04 16:54:39 +03:00
Alexey Milovidov
1d4701b0bc Added some warnings from clang's -Weverything 2019-01-04 15:10:00 +03:00
alexey-milovidov
b8e847edfd
Merge pull request #3955 from yandex/low-cardinality-fix-clone-empty 
Do not copy dictionary in ColumnLowCardinality::cloneEmpty
 2018-12-29 01:23:07 +03:00
Nikolai Kochetov
eb457f2bd2 Do not copy dictionary in ColumnLowCardinality::cloneEmpty 2018-12-28 18:22:38 +03:00
Alexey Milovidov
4e2c1132d9 Fixed UB #3920 2018-12-27 23:48:21 +03:00
Alexey Milovidov
e8328c576b Fixed UB #3926 2018-12-27 03:59:52 +03:00
Alexey Milovidov
c20f05875a Moved code; added comment #3926 2018-12-27 03:34:49 +03:00
Alexey Milovidov
5abb2d02b9 Fixed UB #3926 2018-12-26 08:34:25 +03:00
Alexey Milovidov
c86e861b6d Fixed error #3926 2018-12-26 06:38:57 +03:00
Alexey Milovidov
56bd082105 Fixed UB #3926 2018-12-26 06:15:34 +03:00
Alexey Milovidov
b7f085c525 Fixed UB #3926 2018-12-26 05:47:16 +03:00
Alexey Milovidov
a2fae24e07 Fixed UB #3926 2018-12-26 05:09:59 +03:00
Alexey Milovidov
f2d789d384 Fixed UB #3926 2018-12-26 05:06:54 +03:00
Alexey Milovidov
e8dc222b61 Fixed UB #3926 2018-12-26 03:28:13 +03:00
Amos Bird
8736a3908f left pad 2018-12-24 23:51:06 +08:00
Alexey Milovidov
19d57c78b5 Fixed test #3909 2018-12-23 04:46:30 +03:00
Alexey Milovidov
a8f09809f5 Simplified logic with "IColumn::convertToFullColumnIfConst" (suggested by Amos Bird) [#CLICKHOUSE-2] 2018-12-21 19:00:07 +03:00
alexey-milovidov
c1a2cb7abb
Update ColumnVector.h 2018-12-14 20:54:45 +03:00
alexey-milovidov
6d27777b19
Merge branch 'master' into ubsan-fixes-3 2018-12-14 20:52:54 +03:00
Alexey Milovidov
c39a19c126 Merge branch 'master' of github.com:yandex/ClickHouse 2018-12-14 20:50:23 +03:00
Alexey Milovidov
21c3a3d9e2 UBSan fixes #3021 2018-12-14 20:50:10 +03:00
KochetovNicolai
e4fe6a8e63 Updated test. (#3832) 
* Updated test.

* Updated test.

* Updated test.

* Updated test.

* Updated test.
 2018-12-14 20:32:25 +03:00
Nikolai Kochetov
2cd3bb5ff7 Fix tests. 2018-12-14 14:36:08 +03:00
Nikolai Kochetov
ec59f65a1e Update ReverseIndex. Added tests. 2018-12-13 22:02:28 +03:00
alexey-milovidov
0b4f0ca7d5
Merge pull request #3744 from yandex/low-cardinality-nullable-group-by 
LowCardinality optimization for single nullable column.
 2018-12-07 23:32:27 +03:00
Nikolai Kochetov
2bb57ce472 Support insertion into LowCardinality from old native clients. 2018-12-06 17:08:42 +03:00
Ivan Lezhankin
6089b26ef0 Fix |RangeHashedDictionary| getter against |ColumnConst| 2018-12-04 16:15:20 +03:00
Nikolai Kochetov
98499b1140 LowCardinality optimization for single nullable column. 2018-12-03 21:00:20 +03:00
alesapin
497a09c41b Return to adaptive granularity 2018-11-29 16:12:20 +03:00
Nikolai Kochetov
65e5494326 Fixed size for LowCardinality dictionary permutation. 2018-11-27 21:08:54 +03:00
Alexey Milovidov
c77930fe30 Whitespaces [#CLICKHOUSE-2] 2018-11-26 03:56:50 +03:00
Alexey Milovidov
141e9799e4 Fixed error with "extractURLParameter" function (read after buffer); improved performance; added support for zero bytes in URLs; renamed Chars_t type [#CLICKHOUSE-2] 2018-11-25 03:08:50 +03:00
Alexey Milovidov
7d6fffff48 More style checks [#CLICKHOUSE-3] 2018-11-24 04:48:06 +03:00
Alexey Milovidov
dbbacf4f87 Added more style checks [#CLICKHOUSE-3] 2018-11-23 21:52:00 +03:00
alexey-milovidov
ac29388224
Merge pull request #3632 from yandex/fix-low-cardinality-distributed-group-by 
Fix low cardinality distributed group by
 2018-11-23 16:45:56 +03:00
Nikolai Kochetov
f3aa1292a9 Remove null map cache from ColumnUnique. 2018-11-23 14:55:06 +03:00
Nikolai Kochetov
d64fe4204a Remove null map cache from ColumnUnique. 2018-11-23 13:47:01 +03:00
Nikolai Kochetov
e74b1edb35 Remove null map cache from ColumnUnique. 2018-11-23 13:18:50 +03:00
Nikolai Kochetov
7fea1397d6 Remove null map cache from ColumnUnique. 2018-11-23 11:11:54 +03:00
Nikolai Kochetov
4721b16b51 Fix array mapped functions with low cardinality lambda argument. 2018-11-22 18:52:53 +03:00
Nikolai Kochetov
4d96e88058 Fix distributed group by LowCardinality(Nullable). #3615 2018-11-21 21:59:33 +03:00
Alexey Milovidov
78e72a1962 Little better #3624 2018-11-20 23:09:20 +03:00
proller
160ffb2283
Build fixes (clang 7.0.0+) (#3582) 2018-11-16 15:22:51 +03:00
alexey-milovidov
2f16ec5c79
Merge pull request #3568 from yandex/fix-low-cardinality-nullable-perf 
Fix perf in IColumnUnique::size func.
 2018-11-14 03:27:05 +03:00
alesapin
0a64ef5de8 Add severals ifs for format_version, but have to move this routine to single class 2018-11-12 20:44:43 +03:00
Nikolai Kochetov
3429274de1 Fix perf in IColumnUnique::size func. #3256 2018-11-12 12:03:40 +03:00
Amos Bird
076ec44089
Prioritize rvalue creator for ColumnTuple 
This validates `ColumnTuple::create(Columns({std::move(s_c0), std::move(s_c1)})); `
 2018-11-09 01:24:30 +08:00
alexey-milovidov
6bc7297a92
Merge pull request #3523 from yandex/low-cardinality-fix-extremes 
Low cardinality fix extremes
 2018-11-01 20:54:09 +03:00
Nikolai Kochetov
03b2b609b1 Fix ColumnLowCardinality::getExtremes. #3288 2018-11-01 20:24:05 +03:00
alexey-milovidov
b1db9ec23c
Merge pull request #3436 from amosbird/master 
Flexible fields assignment
 2018-11-01 20:22:28 +03:00
Nikolai Kochetov
dc688ef5e1 Fix nullable comparsion for LowCardinality(Nullable()). #3227 #3256 #3212 2018-11-01 17:57:50 +03:00
Nikolai Kochetov
045b5d5cd8 Fixed LowCardinality(Nullable()) (de)serialization with arena. #3227 #3256 #3212 2018-11-01 17:55:37 +03:00
Amos Bird
3cf2177268 Flexible fields assignment 
Field f;

before:

f = Int64(-42);

after:

f = -42;
 2018-10-24 08:47:33 +08:00
chertus
29bd00f9f4 simple fix for Decimal128 group by [issue-3378] 2018-10-16 10:31:17 +03:00
chertus
465cb6d267 fix for Decimal128 group by [issue-3378] 2018-10-15 22:14:08 +03:00
Alexey Milovidov
f720a5bf95 Fixed typos in code #3373 2018-10-13 17:33:43 +03:00
chertus
5896e45dac SummingMergeTree for Decimal128 [issue-3282] 2018-10-11 17:33:01 +03:00
chertus
c7bf0e77ea add get64() for Decimal32 and Decimal64; remove allow_experimental_decimal_type setting [issue-3282] 2018-10-09 19:50:42 +03:00
Nikolai Kochetov
97add69825 Rename WithDictionary to LowCardinality. 2018-09-28 13:44:59 +03:00
Nikolai Kochetov
d526859011 Added cache for low cardinality function result. [#CLICKHOUSE-3904] 2018-09-25 16:48:52 +03:00
alexey-milovidov
b1eb66c03e
Merge branch 'master' into low-cardinality-fixes 2018-09-21 13:43:37 +03:00
Nikolai Kochetov
94bb37f261 Fix low cardinality permutation. 2018-09-21 11:52:07 +03:00
alexey-milovidov
a52de29fbf
Update ColumnWithDictionary.h 2018-09-20 20:41:54 +03:00
Nikolai Kochetov
673acbdf94 Added more comments. 2018-09-20 17:19:12 +03:00
Nikolai Kochetov
b93ea8e7cc Fixed default value index for LowCardinality(Nullable). 2018-09-19 17:42:59 +03:00
Nikolai Kochetov
a2eb72c64a Fixed ColumnWithDictionary::getPermutation(). [#CLICKHOUSE-3903] 2018-09-17 12:51:47 +03:00
Nikolai Kochetov
e2e31751e9 Support low cardinality columns in aggregation method with fixed keys. [#CLICKHOUSE-3903] 2018-09-14 20:14:31 +03:00
Nikolai Kochetov
3dc5cd3a3a Merged with master. 2018-09-14 12:14:37 +03:00
Nikolai Kochetov
4674beb900 Shared cache for low cradinality single aggregation column. [#CLICKHOUSE-3903] 2018-09-14 11:04:18 +03:00
Nikolai Kochetov
df71c47840 Added dictionary hash for low cardinality column. [#CLICKHOUSE-3903] 2018-09-14 11:04:18 +03:00
Nikolai Kochetov
94bfe50f52 Cache saved hash for low cardinality aggregate method. [#CLICKHOUSE-3903] 2018-09-14 11:04:18 +03:00
Nikolai Kochetov
2eb35dd6ef Cache AggregateDataPtr for single low cardinality column. [#CLICKHOUSE-3903] 2018-09-14 11:04:09 +03:00
Nikolai Kochetov
787e814e4c Low cardinality group by signle column. [#CLICKHOUSE-3903] 2018-09-14 11:03:02 +03:00
Amos Bird
af369483a9 Simply Self. 
> When the normal name of the template (i.e., the name from the enclosing scope, not the injected-class-name) is used, it always refers to the class template itself and not a specialization of the template

http://eel.is/c++draft/temp.local
 2018-09-13 22:59:54 +08:00