319ab5f2c2
enh: support hash join
2024-04-12 15:44:23 +08:00
337f39191e
fix: eliminate project issue
2024-04-03 18:35:50 +08:00
6e674bc1de
Merge remote-tracking branch 'origin/3.0' into feat/TD-27337
2024-03-15 18:11:37 +08:00
3a0df8be8d
fix(query): handle the calculation of logic expression with different result rows, when constant expression exists.
2024-03-13 23:13:24 +08:00
85cca872a5
enh: support timetruncate function
2024-02-29 17:52:53 +08:00
cb2ea4a721
fix(stream): take ver snapshot for all vgroups before launching stream with fill-history option opened.
2024-02-01 11:37:57 +08:00
27aa90d6b0
feat: sclfuns.c finished
2024-01-25 09:12:02 +08:00
f010e18ff0
fix: LEASTSQUARES func result stack overflow
2024-01-17 18:28:00 +08:00
737abbebb7
Revert "fix: LEASTSQUARES func result overflow"
2024-01-17 10:09:56 +08:00
fdb847fd36
fix: LEASTSQUARES func result overflow
2024-01-16 15:34:05 +08:00
153221e1d6
fix: cache scan heap overflow and forbid DDD for to_char in windows
2023-12-21 19:46:33 +08:00
b99b9986b8
fix:heap overflow if print json value node
2023-12-11 19:46:51 +08:00
a3737fe54d
Fix bug [4258]: add process ignore/no timezone for timetruncate unit is 1w
2023-11-23 18:08:58 +08:00
45d7e9f02b
fix: goto error
2023-11-22 10:48:08 +08:00
ba8a410d6d
fix toISO8601Function
2023-11-12 19:15:41 +08:00
ea5adf5511
report not supported error when DDD but no DD specified
2023-11-09 20:20:00 +08:00
92240d7f95
Merge pull request #23505 from taosdata/fix/3.0/TS-4052
...
fix: nano seconds database error
2023-11-03 10:27:40 +08:00
b71a013b8d
fix: nano seconds database error
2023-11-02 09:36:46 +08:00
91df56fcf0
Merge remote-tracking branch 'origin/3.0' into feat/TD-25204
2023-10-31 18:44:54 +08:00
70850697a4
feat: support to_timestamp/to_char fix comments
2023-10-27 09:54:16 +08:00
6dcc555bbc
fix: view privilege issue
2023-10-25 10:47:01 +08:00
f299a28109
feat: support to_timestamp/to_char
2023-10-23 19:36:03 +08:00
fc824a3bb9
fix: timestamp add return float when get time range
2023-09-27 16:39:49 +08:00
952d6e1492
fix: coverity issues
2023-09-08 10:26:37 +08:00
cc17848b78
fix: merge 3.0 to main
2023-09-01 13:24:47 +08:00
322e8c6697
fix: use col cell size instead of total col data size
2023-08-28 13:43:37 +08:00
09463cb43e
enhance: fix buffer size overflow
2023-08-28 11:28:49 +08:00
8f91da24e4
fix: type convert failure returns errcode
...
TSDB_CODE_SCALAR_CONVERT_ERROR:
"Cannot convert to specific type"
2023-07-11 10:20:50 +08:00
cde9eac954
enh: add procedures on server for udf/udaf in nested queries where outer query is
...
constant table
2023-07-10 11:34:32 +08:00
3519e9170e
Merge remote-tracking branch 'origin/main' into 3.0
2023-06-29 11:13:45 +08:00
308ba7a02e
fix: type geometry predicates support
...
support "=, <>, is null, is not null, in, not in"
2023-06-29 09:44:51 +08:00
5bb7d26501
fix coverity scan issue
2023-06-28 11:12:10 +08:00
e2d45438cb
Merge pull request #21405 from taosdata/szhou/scl-flt
...
enhance: scalar filter improvement
2023-05-28 18:49:39 +08:00
b83bf9163e
fix: restore scalar mode computation and add filterScalarMode config variable and add test case
2023-05-26 14:46:32 +08:00
81c796953e
fix: address sanitizer error
2023-05-26 10:55:52 +08:00
cea8334427
Merge pull request #21449 from taosdata/refact/fillhistory
...
refactor: remove the module dependency. TD-24279
2023-05-26 09:01:45 +08:00
cbbd09b85c
fix: for logical and condition, each element shall be collectable operator
2023-05-25 22:37:49 +08:00
469b2b573c
fix: fix error during emptyTsRange.sim
2023-05-25 21:49:28 +08:00
61b0635293
fix: get time range using new scalar mode range
2023-05-25 16:27:48 +08:00
de1848cb08
enhance: use scalar mode to run ci test
2023-05-25 14:51:53 +08:00
768372fc7b
fix: fix compilation warning
2023-05-24 16:45:06 +08:00
984211f3b4
Feature/3.0 geometry ( #21037 )
...
* Add GEOMETRY data type and make sql.c able to parse it. The GEMETRY works like BINARY so far.
* add GEOMETRY type into gConvertTypes to fix some issues like DELETE calling
* change some test cases to make sure no same timestamp is inserted, and add my smoketest.sh
* Add a function MakePoint() and introduce a lib geometry
* implement sql functions GeomFromText() and AsText()
* Use GEOS *_r funcions instead for thread safety
* Handle with TSDB_DATA_TYPE_GEOMETRY when INSERT geometry data by converting WKT.
Add geosWrapper to wrap the basic GEOS functions for TDEngine.
* refactor AsText and MakePoint functions to be like GeomFromText
* Show WKT when print geometry data in screen
Dump hex data when dump geometry data in a file
* define TYPE_BYTES item for TSDB_DATA_TYPE_GEOMETRY, which casued some strange issues.
* set number of decimals of WKT to 6
* Implement SQL function Intersects()
* refactor geometry sql functions
* Add geosErrMsgeHandler() to get the GEOS error detail
* use threadlocal to instantiate SGeosContext
call destroyGeosContext() only if the thread exists
* remove SGeosContext *context param for all geometry functions since we use thread local one,
so that all caller do not need to know the context.
* Modify Intersects() to call PreparedIntersects() when one of param is a constant, which has higher performance.
* rename prepareFn() to initCtxFn() to avoid confusion with PreparedFn
* Add prefix "ST_" for all geometry functions
* move getThreadLocalGeosCtx() and destroyThreadLocalGeosCtx() into util,
so that all unit test tools can compile
* Add unit test for geometry lib, only test MakePoint so far
* refactor and enhance existing cases in geomFuncTest
* implement NULL type and NULL value test for geomFuncTest
* add test on geomFromText()
* add unit test on AsText() in geomFuncTest
* combine some makePointFunction test items
* add intersectsFunctionTwoColumns test
refactor on callGeomFromTextWrapper functions
* enhance intersectsFunction test to add cases like input constant , NULL type, NULL value, or wrong content
* add more cases into intersectsFunction test
* Add basic test on geometry in system test
* Add ST_GeomFromText and ST_AsText function test in system test on geometry
* add ST_Intersects function test in system test on geometry
* support to check expectedErrno in system test on geometry
* adjust geomTest unit test and geometry system test
* add geometry data type and functions in doc english version
* implement touchesFunction() in geometry lib
refactor geometry relation functions model
* separate gemFuncTest into several src files
* add unit test on touchesFunction
* support sql function ST_Touches()
add system test on ST_Touches
* add docs for ST_Touches()
* Add ST_Contains()
* Add ST_Covers()
* Add ST_Equals()
* add swapAllowed param for geomRelationFunction()
read geom2 earlier intead of at doGeosRelation()
* Add ST_ContainsProperly()
* build on windows
* Merge from 3.0 to 3.0_geometry
* change macro definition TSDB_DATA_TYPE_GEOMETRY as the last one for compatibility
* change '\\NULL' to 'NULL' back in shellDumpFieldToFile()
* add /usr/local/include into include directory
* add /usr/local/inlcude and /usr/local/lib in cmake.platform for DARWIN
2023-05-24 15:36:46 +08:00
5b1e0be756
enhance: add log
2023-05-24 13:41:21 +08:00
383c828c85
fix: before review
2023-05-24 11:18:44 +08:00
2e4c14c18c
fix: fix bugs
2023-05-23 21:30:41 +08:00
e67b532d8a
refactor: refactor the module dependency.
2023-05-23 18:29:23 +08:00
22616d235a
fix: fix minior bugs
2023-05-23 16:36:27 +08:00
857cf3d269
fix: fix bugs
2023-05-23 14:29:33 +08:00
99620d434d
fix: fix bugs
2023-05-23 14:11:52 +08:00
c9140e547e
fix: fix bugs of wrongly use sfltscloperator
2023-05-23 14:08:20 +08:00
77a1de444c
fix: where c7 means c7 is true, the right child is null
2023-05-23 10:47:58 +08:00
24ae8d7ecb
fix: fix ci memory leak error
2023-05-23 09:49:42 +08:00
43ac6fb1fd
fix: all null from block sma
2023-05-23 08:43:31 +08:00
6456d5dccf
enhance: code finish
2023-05-22 11:41:19 +08:00
1f6d894dfd
fix: save work
2023-05-19 17:06:03 +08:00
3e92ec7a8a
fix: save work
2023-05-19 14:09:37 +08:00
09837b7639
fix: save work
2023-05-18 19:00:10 +08:00
dec15bf4ff
Merge branch '2.0' of github.com:taosdata/TDengine into szhou/scl-flt
2023-05-18 14:26:02 +08:00
e16f4c7c44
fix: refactor and save work
2023-05-17 16:57:09 +08:00
51fa363fd5
feature: save work
2023-05-15 11:34:05 +08:00
bdee8ab3c1
enhance: save work and sync home/office
2023-05-12 19:00:26 +08:00
7ef16e1922
other: merge main.
2023-05-12 11:49:53 +08:00
e22c62ffba
fix: data compare of signed and unsigned integers
2023-05-08 18:13:37 +08:00
ad7c3218f7
Merge pull request #21111 from taosdata/fix/liaohj_main
...
enh(query): stop tsdb reader ASAP. TD-23249
2023-04-27 17:45:38 +08:00
17a5691afb
refactor: remove assert.
2023-04-27 15:37:33 +08:00
e584bb3ea1
feat: subtable level privilege
2023-04-25 17:39:28 +08:00
77a8e3b213
Merge branch '3.0' into enh/TD-21161-3.0
2023-04-21 16:04:09 +08:00
9581dcae7f
enh: add param for to_unixtimestamp to return timestamp type
2023-04-18 14:17:22 +08:00
50053fdc01
Merge branch '3.0' into enh/TD-21161-3.0
2023-04-18 11:13:30 +08:00
d4cb608505
Merge pull request #20885 from taosdata/fix/TS-3108
...
fix: fix timestamp constant comparison precision error
2023-04-14 09:27:03 +08:00
7414f28d17
fix translatefunc not getting precision issue
2023-04-13 11:22:15 +08:00
dcf77f2529
fix: fix constant comparision precision error
2023-04-12 14:24:34 +08:00
e976fcb91d
Merge branch '3.0' into enh/TD-21161-3.0
2023-04-07 17:51:35 +08:00
c134432c45
merge main
2023-04-06 09:31:45 +08:00
23ec9287c9
fix: fix tsim crash on windows due to invalid input to strftime
2023-04-04 10:33:41 +08:00
6c64b760a0
fix: fix tsim crash on windows due to invalid input to strftime
2023-04-03 17:58:43 +08:00
37bc1bca36
enh: column/row max length support up to 64K
2023-04-03 17:00:52 +08:00
22ad3129b9
fix: query schema is old issue
2023-03-28 15:21:47 +08:00
522b9ec2b2
Merge pull request #20363 from taosdata/fix/xftan/timetruncate
...
fix: TIMETRUNCATE with 1d return unexpected result
2023-03-10 10:05:48 +08:00
b2610da03c
fix: TIMETRUNCATE with 1d return unexpected result
2023-03-09 14:29:05 +08:00
3cea46db00
fix(query): fix scalar calculation crash in stream when input rows is 0
2023-03-08 17:45:25 +08:00
8a23f0ce3b
fix:set timestamp precision
2023-03-01 18:59:27 +08:00
f97a140a3c
merge 3.0
2023-02-27 14:16:33 +08:00
cb2f09ed6c
Merge pull request #20139 from taosdata/fix/TD-22664-3.0
...
fix: fix coverity issue
2023-02-26 10:04:46 +08:00
d6dd087f84
merge main
2023-02-25 10:29:20 +08:00
9342d796f0
Merge branch '3.0' into fix/TD-22664-3.0
2023-02-24 18:30:04 +08:00
961107d1ca
merge main
2023-02-24 16:55:50 +08:00
3f6e8d4f82
Merge pull request #20111 from taosdata/fix/TD-22709-main
...
fix: fix asan error
2023-02-24 14:35:17 +08:00
49fc02c52e
fix coverity issue
2023-02-24 10:08:53 +08:00
3199ba2357
fix: fix asan error
2023-02-23 17:00:19 +08:00
cda49b559c
fix: fix asan error
2023-02-23 16:55:00 +08:00
644ba11a55
fix: fix asan error
2023-02-22 18:53:10 +08:00
a185561405
fix: fix asan error
2023-02-22 18:46:59 +08:00
7fe250412f
refactor:do some internal refactor.
2023-02-20 10:13:11 +08:00
8d187efc18
refactor:do some internal refactor.
2023-02-20 10:04:08 +08:00
b9918b0eda
fix: add alter dnode configuration validdation
2023-02-14 13:49:07 +08:00
abae9e0790
fix(query): set 0 when result is not qualified.
2023-01-10 23:40:16 +08:00
e3b776c7f3
Merge branch 'main' into enh/TD-21206
2023-01-04 09:18:38 +08:00
4b81962269
fix asserts
2023-01-04 09:16:00 +08:00
028ded935a
fix assert in filter.c
2023-01-03 16:06:44 +08:00
0ddb9be3d9
fix assert in sclfunc.c
2023-01-03 15:47:22 +08:00
263a1a877e
fix assert in scalar.c
2023-01-03 15:32:32 +08:00
8146113835
fix asserts in sclvector.c
2023-01-03 15:27:54 +08:00
7eeea8a29c
fix(query): fix the invalid access, and do some internal refactor.
2022-12-29 17:56:20 +08:00
011c83956b
refactor: do some internal refactor.
2022-12-28 19:12:36 +08:00
c801f3a7f6
Merge branch 'main' into feature/3_liaohj
2022-12-27 17:15:22 +08:00
1e69538c37
fix(query): opt filter perf.
2022-12-27 16:55:38 +08:00
05580340d8
fix: invalid node list node issue
2022-12-20 18:25:33 +08:00
b9e3f01c7c
fix: empty node in operator node
2022-12-20 18:15:25 +08:00
978d45ffc1
enh: optimize converting timestamp at client side
2022-12-15 16:56:35 +08:00
6d94afe48f
Revert "refact: adjust some assert cases"
2022-12-07 21:51:17 +08:00
d5126d469a
refact: replcase ASSERT with tAssert
2022-12-07 18:42:48 +08:00
f69a188f7e
refact: replcase ASSERT with tAssert
2022-12-07 18:37:40 +08:00
0ecb0d26f2
Merge pull request #18694 from taosdata/fix/TS-2144
...
enh(query): add timetruncate function ignore timezone option for 1d
2022-12-05 17:18:18 +08:00
e18da31a5d
enh(query): add timetruncate function ignore timezone option for 1d
2022-12-05 12:00:12 +08:00
241638de33
Merge pull request #18661 from taosdata/fix/liao_cov
...
enh(query): improve the performance and add some todo
2022-12-03 21:41:38 +08:00
658cb393a7
enh(query): improve the performance and add some todo
2022-12-03 12:11:20 +08:00
d9c261cd13
refact: remove some error codes
2022-12-03 10:17:02 +08:00
6d70f48802
Merge pull request #18592 from taosdata/feature/3_liaohj
...
enh(query): optimize query perf.
2022-12-02 21:00:35 +08:00
7bb30150a9
fix: fix memory leak
2022-12-02 14:23:36 +08:00
1fcd99176b
fix: filter memory leak cause of same const strings
2022-12-02 10:59:52 +08:00
f8a2ab8338
refactor: do some internal refactor.
2022-12-01 17:24:26 +08:00
dac930352b
enh(query): optimize the perf in compare.
2022-11-29 12:22:04 +08:00
5a3e4dc1c8
fix(query): set correct null check function.
2022-11-28 19:48:04 +08:00
b53957c7bb
fix(query): set correct ptr.
2022-11-28 18:57:36 +08:00
b2b26f0c3c
refactor: add an revised function to do compare.
2022-11-28 18:52:14 +08:00
90c1e7347f
refactor: do some internal refactor.
2022-11-28 18:42:39 +08:00
6e81e8cc73
refactor: do some internal refactor.
2022-11-28 12:32:40 +08:00
1fc8f273bf
fix TD-20751 mem leak
2022-11-25 19:50:57 +08:00
ef8c68a098
fix TD-20751 mem leak
2022-11-25 19:38:06 +08:00
c757b26d15
fix mem leak
2022-11-25 15:45:21 +08:00
dff0b3c4bb
fix: [ASAN] heap buffer overflow in sclfunc.c
2022-11-23 22:43:11 +08:00
4f176e325d
fix: [ASAN] devive by zero
2022-11-21 18:01:48 +08:00
9994a9f2c5
Merge branch '3.0' of github.com:taosdata/TDengine into szhou/fixbugs
2022-11-18 16:24:49 +08:00
c5cb72291f
fix: fix windows compilation error
2022-11-18 16:24:28 +08:00
c2d4d0907d
fix: fix asan issue
2022-11-18 11:41:59 +08:00
40af2903c1
fix: scalar mnode for in set more than 10 and print only 1000 groups to log in filter mode
2022-11-17 16:06:12 +08:00
cf601b206f
fix(query): ASAN heap buffer overflow
...
TD-20454
2022-11-16 15:00:57 +08:00
aae3475900
fix(query): ASAN heap buffer overflow
...
TD-20454
2022-11-16 14:36:51 +08:00
21e62f1279
Merge remote-tracking branch 'origin/3.0' into fix/TD-20412
2022-11-15 12:53:22 +08:00
d985cb714f
fix: fix asan issues
2022-11-15 11:38:01 +08:00
cd3722837d
Merge remote-tracking branch 'origin/3.0' into fix/3.0_bugfix_wxy
2022-11-15 09:44:13 +08:00
14b4adc6ce
fix: memory leak
2022-11-15 09:39:17 +08:00
d2468c5548
fix: fix asan issues
2022-11-14 14:22:13 +08:00
e0f2a4b5fe
Merge branch '3.0' into fix/TD-20277
2022-11-09 16:42:22 +08:00
652c6388f2
fix: fix valgrind invalid read error
2022-11-09 16:40:17 +08:00
884144ba23
Merge pull request #17960 from taosdata/fix/TD-20267
...
fix: filter merge issue
2022-11-08 17:52:31 +08:00
d09351da68
fix: filter merge issue
2022-11-08 14:22:00 +08:00
fc73d39add
fix: fix compare invalid read issues
2022-11-08 13:27:17 +08:00
270404318c
other: merge 3.0
2022-11-07 09:28:22 +08:00
8bf01cdecb
fix(query): fix error in unit test.
2022-11-05 00:02:25 +08:00
8c4be7dc21
refactor: do some internal refactor.
2022-11-04 22:13:40 +08:00
03f4918b3b
refactor: do some internal refactor.
2022-11-04 18:46:48 +08:00
9c33d10ad9
refactor: remove the unnecessary function.
2022-11-04 09:15:14 +08:00
abfa8c1d87
fix(query): add api to memset buffer for filtering data.
2022-11-03 22:05:08 +08:00
973a942d0f
enh: support get meta only from cache
2022-11-01 11:43:40 +08:00
d212be8a37
fix:defects in coverity
2022-10-26 17:54:19 +08:00
bf0a93e8d0
fix: compute udf funcs with all const arguments on server side
2022-10-25 15:24:13 +08:00
b53a51e5e7
fix coverity
2022-10-25 11:11:17 +08:00
3a4dc8f0da
Merge branch '3.0' into fix/coverity_glzhao
2022-10-25 09:47:46 +08:00
c04ade7867
fix: coverity issues
...
CID: 400109
2022-10-24 19:48:58 +08:00
23b7150dee
fix: coverity issues
...
CID: 399845
2022-10-24 19:20:10 +08:00
68e274eba2
fix: coverity issues
...
CID: 399665
2022-10-24 16:22:35 +08:00
4780e88ce9
fix: coverity issues
...
CID: 400330
2022-10-24 15:52:52 +08:00
120a3ca4b9
fix: coverity issues
...
CID: 400059
2022-10-24 15:18:27 +08:00
5728685772
fix: coverity issues
...
CID: 399907
2022-10-24 14:54:10 +08:00
c12f1b6e6a
fix: coverity issues
...
CID: 399890
2022-10-24 14:51:51 +08:00
623581a51d
fix: coverity issues
...
CID: 399721
2022-10-24 14:26:13 +08:00
c41713cf21
Merge pull request #17495 from taosdata/fix/liao_cov
...
refactor: remove redundant codes and do some internal refactor.
2022-10-20 13:16:02 +08:00
ae625d3199
refactor: remove redundant codes and do some internal refactor.
2022-10-19 22:33:15 +08:00
fe5b898ee5
Merge pull request #17430 from taosdata/fix/TD-19609
...
fix: fix case when crash issue
2022-10-18 17:37:37 +08:00
c51629e5d3
Merge pull request #17423 from taosdata/fix/TS-1901
...
fix: fix varchar and bigint compare issue
2022-10-18 13:16:27 +08:00
ab7a00abbe
fix: fix case when crash issue
2022-10-18 11:54:30 +08:00
bdb81e2b89
fix: fix varchar and bigint compare issue
2022-10-18 10:44:24 +08:00
1a3b2fa4f2
fix: coverity issues
...
CID: 399527
2022-10-17 16:55:27 +08:00
51dd72ec82
fix: coverity issues
...
CID: 372918
2022-10-17 15:53:24 +08:00
bcf2cfeed7
fix: coverity issues
...
CID: 354713
2022-10-17 11:06:02 +08:00
52e0681769
fix: fix merge issue
2022-10-14 09:16:02 +08:00
f3919c4450
Merge remote-tracking branch 'origin/3.0' into feat/caseWhen
2022-10-14 09:14:01 +08:00
d8e32fb439
more code format
2022-10-13 14:03:23 +08:00
a13f553868
Merge remote-tracking branch 'origin/3.0' into feat/caseWhen
2022-10-12 13:33:41 +08:00
c485718d32
feat: add more case when cases
2022-10-12 11:46:49 +08:00
52bf961622
more code
2022-10-12 11:09:42 +08:00
5a8172d6c2
Merge pull request #17298 from taosdata/fix/glzhao_coverity
...
fix: fix coverity issues
2022-10-11 18:51:52 +08:00
e5c3ff7158
fix: coverity issues
...
CID: 399950
2022-10-11 17:08:30 +08:00
936c7b6276
fix: coverity issues
...
CID: 400042
2022-10-11 16:00:19 +08:00
37a9143fcb
fix: coverity issues
...
CID: 400170
2022-10-11 14:33:10 +08:00
187735dede
fix(query): fix the invalid write.
2022-10-11 10:49:19 +08:00
2dcb5a9c29
fix(query): fix an typo.
2022-10-10 22:00:36 +08:00
73b5a001d6
fix(query): fix invalid type convert in cast function.
2022-10-10 19:15:52 +08:00
55a26990da
feat: support case when cases
2022-10-08 19:07:43 +08:00
50b396c818
fix: fix case when issues
2022-09-30 18:13:55 +08:00
8ab016fd9f
Merge remote-tracking branch 'origin/3.0' into feat/caseWhen
2022-09-30 15:21:03 +08:00
b03b139b76
feat: support case when clause
2022-09-30 14:59:43 +08:00
2d3992b72b
feat: support case when clause
2022-09-29 19:19:49 +08:00
0022a766b3
enh: support case when
2022-09-26 19:21:57 +08:00
4ebee6b232
refactor(query): do some internal refactor.
2022-09-26 11:22:26 +08:00
91c86188fc
Merge remote-tracking branch 'origin/feature/3_liaohj' into feature/3_liaohj
2022-09-23 10:03:13 +08:00
6f33ae921e
refactor(query): do some internal refactor.
2022-09-23 10:02:43 +08:00
7ee2449a73
Merge branch '3.0' into feature/3_liaohj
2022-09-22 14:03:17 +08:00
dapan1121
Haojun Liao
Alex Duan
facetosea
xinsheng Ren
wangjiaming0909
wangmm0220
root
Bob Liu
dapan1121
shenglian zhou
Shungang Li
Ganlin Zhao
Haojun Liao
Dingle Zhang
Xiaoyu Wang
kailixu
Shengliang Guan
t_max
54liuyao
Shengliang Guan
yihaoDeng
Hongze Cheng