Add more functions:
- Numeric Functions: PI(),ROUND(),TRUNC(),EXP(),LN(),SIGN(),DEGREES(),RADIANS().
- String Functions: CHAR(),ASCII(),POSITION(),TRIM(),REPLACE(),REPEAT().
- Date and Time Functions: WEEKDAY(),DAYOFWEEK(),WEEK(),WEEKOFYEAR().
- Aggregate Functions: VAR_POP().
Modify some functions:
- ROUND(): support round to given decimal places.
- CHAR_LENGTH(): support calculate multi-byte character's length.
- TIMEDIFF(): result will be negative when expr1 < expr2.
- STDDEV(): add alias name STDDEV_POP().
- SUBSTR(): add alias name SUBSTRING().
support new syntax SUBSTRING/SUBSTR(expr FROM pos [FOR len]).
* 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
